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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en"><italic>Laminaria japonica</italic> Extract, an Inhibitor of <italic>Clavibater michiganense</italic> Subsp. <italic>Sepedonicum</italic></title><author><name sortKey="Cai, Jin" sort="Cai, Jin" uniqKey="Cai J" first="Jin" last="Cai">Jin Cai</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author><author><name sortKey="Feng, Jia" sort="Feng, Jia" uniqKey="Feng J" first="Jia" last="Feng">Jia Feng</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author><author><name sortKey="Xie, Shulian" sort="Xie, Shulian" uniqKey="Xie S" first="Shulian" last="Xie">Shulian Xie</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author><author><name sortKey="Wang, Feipeng" sort="Wang, Feipeng" uniqKey="Wang F" first="Feipeng" last="Wang">Feipeng Wang</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author><author><name sortKey="Xu, Qiufeng" sort="Xu, Qiufeng" uniqKey="Xu Q" first="Qiufeng" last="Xu">Qiufeng Xu</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">24714388</idno><idno type="pmc">3979835</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3979835</idno><idno type="RBID">PMC:3979835</idno><idno type="doi">10.1371/journal.pone.0094329</idno><date when="2014">2014</date><idno type="wicri:Area/Pmc/Corpus">000457</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000457</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main"><italic>Laminaria japonica</italic> Extract, an Inhibitor of <italic>Clavibater michiganense</italic> Subsp. <italic>Sepedonicum</italic></title><author><name sortKey="Cai, Jin" sort="Cai, Jin" uniqKey="Cai J" first="Jin" last="Cai">Jin Cai</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author><author><name sortKey="Feng, Jia" sort="Feng, Jia" uniqKey="Feng J" first="Jia" last="Feng">Jia Feng</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author><author><name sortKey="Xie, Shulian" sort="Xie, Shulian" uniqKey="Xie S" first="Shulian" last="Xie">Shulian Xie</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author><author><name sortKey="Wang, Feipeng" sort="Wang, Feipeng" uniqKey="Wang F" first="Feipeng" last="Wang">Feipeng Wang</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author><author><name sortKey="Xu, Qiufeng" sort="Xu, Qiufeng" uniqKey="Xu Q" first="Qiufeng" last="Xu">Qiufeng Xu</name><affiliation><nlm:aff id="aff1"></nlm:aff></affiliation></author></analytic><series><title level="j">PLoS ONE</title><idno type="eISSN">1932-6203</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Bacterial ring rot of potato is one of the most serious potato plant and tuber diseases. <italic>Laminaria japonica</italic> extract was investigated for its antimicrobial activity against <italic>Clavibater michiganense</italic> subsp. <italic>sepedonicum</italic> (Spieckermann & Kotthoff) Davis et al., the causative agent of bacterial ring rot of potato. The results showed that the optimum extraction conditions of antimicrobial substances from <italic>L. japonica</italic> were an extraction temperature of 80°C, an extraction time of 12 h, and a solid to liquid ratio of 1∶25. Active compounds of <italic>L. japonica</italic> were isolated by solvent partition, thin layer chromatography (TLC) and column chromatography. All nineteen fractionations had antimicrobial activities against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>, while Fractionation three (Fr.3) had the highest (<italic>P</italic><0.05) antimicrobial activity. Chemical composition analysis identified a total of 26 components in Fr.3. The main constituents of Fr.3 were alkanes (80.97%), esters (5.24%), acids (4.87%) and alcohols (2.21%). Antimicrobial activity of Fr.3 against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> could be attributed to its ability to damage the cell wall and cell membrane, induce the production of reactive oxygen species (ROS), increase cytosolic Ca<sup>2+</sup> concentration, inhibit the glycolytic pathway (EMP) and tricarboxylic acid (TCA) cycle, inhibit protein and nucleic acid synthesis, and disrupt the normal cycle of DNA replication. These findings indicate that <italic>L. japonica</italic> extracts have potential for inhibiting <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Navarro, C" uniqKey="Navarro C">C Navarro</name></author><author><name sortKey="Abelenda, Ja" uniqKey="Abelenda J">JA Abelenda</name></author><author><name sortKey="Cruz R, E" uniqKey="Cruz R E">E Cruz–Oró</name></author><author><name sortKey="Cuellar, Ca" uniqKey="Cuellar C">CA Cuéllar</name></author><author><name sortKey="Tamaki, S" uniqKey="Tamaki S">S Tamaki</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Van Der Wolf, Jm" uniqKey="Van Der Wolf J">JM van der Wolf</name></author><author><name sortKey="Van Beckhoven, Jrcm" uniqKey="Van Beckhoven J">JRCM van Beckhoven</name></author><author><name sortKey="Hukkanen, A" uniqKey="Hukkanen A">A Hukkanen</name></author><author><name 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<front><journal-meta><journal-id journal-id-type="nlm-ta">PLoS One</journal-id><journal-id journal-id-type="iso-abbrev">PLoS ONE</journal-id><journal-id journal-id-type="publisher-id">plos</journal-id><journal-id journal-id-type="pmc">plosone</journal-id><journal-title-group><journal-title>PLoS ONE</journal-title></journal-title-group><issn pub-type="epub">1932-6203</issn><publisher><publisher-name>Public Library of Science</publisher-name><publisher-loc>San Francisco, USA</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">24714388</article-id><article-id pub-id-type="pmc">3979835</article-id><article-id pub-id-type="publisher-id">PONE-D-14-01641</article-id><article-id pub-id-type="doi">10.1371/journal.pone.0094329</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="Discipline-v2"><subject>Biology and Life Sciences</subject><subj-group><subject>Microbiology</subject><subj-group><subject>Bacteriology</subject><subj-group><subject>Gram Positive</subject></subj-group></subj-group><subj-group><subject>Medical Microbiology</subject><subj-group><subject>Microbial Pathogens</subject><subj-group><subject>Bacterial Pathogens</subject></subj-group></subj-group></subj-group><subj-group><subject>Microbial Control</subject><subject>Plant Microbiology</subject></subj-group></subj-group><subj-group><subject>Organisms</subject><subj-group><subject>Plants</subject></subj-group></subj-group><subj-group><subject>Plant Science</subject><subj-group><subject>Plant Pathology</subject></subj-group></subj-group></subj-group></article-categories><title-group><article-title><italic>Laminaria japonica</italic> Extract, an Inhibitor of <italic>Clavibater michiganense</italic> Subsp. <italic>Sepedonicum</italic></article-title><alt-title alt-title-type="running-head"><italic>Laminaria japonica,</italic> an Inhibitor of <italic>C. michiganense</italic> Subsp. <italic>Sepedonicum</italic></alt-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Cai</surname><given-names>Jin</given-names></name><xref ref-type="aff" rid="aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Feng</surname><given-names>Jia</given-names></name><xref ref-type="aff" rid="aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Xie</surname><given-names>Shulian</given-names></name><xref ref-type="aff" rid="aff1"></xref><xref ref-type="corresp" rid="cor1"><sup>*</sup></xref></contrib><contrib contrib-type="author"><name><surname>Wang</surname><given-names>Feipeng</given-names></name><xref ref-type="aff" rid="aff1"></xref></contrib><contrib contrib-type="author"><name><surname>Xu</surname><given-names>Qiufeng</given-names></name><xref ref-type="aff" rid="aff1"></xref></contrib></contrib-group><aff id="aff1"><addr-line>School of Life Science, Shanxi University, Taiyuan, People’s Republic of China</addr-line></aff><contrib-group><contrib contrib-type="editor"><name><surname>Wilson</surname><given-names>Richard A.</given-names></name><role>Editor</role><xref ref-type="aff" rid="edit1"></xref></contrib></contrib-group><aff id="edit1"><addr-line>University of Nebraska-Lincoln, United States of America</addr-line></aff><author-notes><corresp id="cor1">* E-mail: <email>xiesl@sxu.edu.cn</email></corresp><fn fn-type="conflict"><p><bold>Competing Interests: </bold>The authors have declared that no competing interests exist.</p></fn><fn fn-type="con"><p>Conceived and designed the experiments: JC JF SX. Performed the experiments: JC JF FW QX. Analyzed the data: JC JF SX. Contributed reagents/materials/analysis tools: JC JF SX FW QX. Wrote the paper: JC JF SX.</p></fn></author-notes><pub-date pub-type="collection"><year>2014</year></pub-date><pub-date pub-type="epub"><day>8</day><month>4</month><year>2014</year></pub-date><volume>9</volume><issue>4</issue><elocation-id>e94329</elocation-id><history><date date-type="received"><day>15</day><month>1</month><year>2014</year></date><date date-type="accepted"><day>14</day><month>3</month><year>2014</year></date></history><permissions><copyright-year>2014</copyright-year><copyright-holder>Cai et al</copyright-holder><license><license-p>This is an open-access article distributed under the terms of the <ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution License</ext-link>, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.</license-p></license></permissions><abstract><p>Bacterial ring rot of potato is one of the most serious potato plant and tuber diseases. <italic>Laminaria japonica</italic> extract was investigated for its antimicrobial activity against <italic>Clavibater michiganense</italic> subsp. <italic>sepedonicum</italic> (Spieckermann & Kotthoff) Davis et al., the causative agent of bacterial ring rot of potato. The results showed that the optimum extraction conditions of antimicrobial substances from <italic>L. japonica</italic> were an extraction temperature of 80°C, an extraction time of 12 h, and a solid to liquid ratio of 1∶25. Active compounds of <italic>L. japonica</italic> were isolated by solvent partition, thin layer chromatography (TLC) and column chromatography. All nineteen fractionations had antimicrobial activities against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>, while Fractionation three (Fr.3) had the highest (<italic>P</italic><0.05) antimicrobial activity. Chemical composition analysis identified a total of 26 components in Fr.3. The main constituents of Fr.3 were alkanes (80.97%), esters (5.24%), acids (4.87%) and alcohols (2.21%). Antimicrobial activity of Fr.3 against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> could be attributed to its ability to damage the cell wall and cell membrane, induce the production of reactive oxygen species (ROS), increase cytosolic Ca<sup>2+</sup> concentration, inhibit the glycolytic pathway (EMP) and tricarboxylic acid (TCA) cycle, inhibit protein and nucleic acid synthesis, and disrupt the normal cycle of DNA replication. These findings indicate that <italic>L. japonica</italic> extracts have potential for inhibiting <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>.</p></abstract><funding-group><funding-statement>These authors have no support or funding to report.</funding-statement></funding-group><counts><page-count count="21"></page-count></counts></article-meta></front><body><sec id="s1"><title>Introduction</title><p>Potato, the third largest global food crop after wheat and rice, is cultivated for its underground storage stems or tubers, which are rich in starch and other nutrients <xref rid="pone.0094329-Navarro1" ref-type="bibr">[1]</xref>. Bacterial ring rot of potato is one of the most serious potato plant and tuber diseases. It is caused by the gram positive bacterium <italic>Clavibater michiganense</italic> subsp. <italic>sepedonicum</italic> (Spieckermann & Kotthoff) Davis et al., and is a highly infectious disease found in all major potato growing areas <xref rid="pone.0094329-vanderWolf1" ref-type="bibr">[2]</xref>. <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> may be disseminated by infected tubers, and from them by cutting bags, planters, and knives. <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> is difficult to control because it can survive for long periods <xref rid="pone.0094329-vanBeckhoven1" ref-type="bibr">[3]</xref>. Chemical bactericides such as bleach, quaternary ammonia, potassium permanganate, copper sulfate, chlorine dioxide, iodine and phenol–containing compounds are the most commonly used methods for controlling <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic><xref rid="pone.0094329-Qiu1" ref-type="bibr">[4]</xref>–<xref rid="pone.0094329-Secor1" ref-type="bibr">[6]</xref>. However, these substances are dangerous to wildlife and humans <xref rid="pone.0094329-Knight1" ref-type="bibr">[7]</xref>. In addition, chemical bactericides may persist in the environment for years and are not readily biodegradable <xref rid="pone.0094329-Cardoso1" ref-type="bibr">[8]</xref>–<xref rid="pone.0094329-Brady1" ref-type="bibr">[10]</xref>. Plants are exposed to various pathogenic fungi and bacteria <xref rid="pone.0094329-Asano1" ref-type="bibr">[11]</xref>. As a countermeasure, plants produce antimicrobial substances that can act as defense mechanisms against phytopathogens <xref rid="pone.0094329-Chen2" ref-type="bibr">[12]</xref>–<xref rid="pone.0094329-Ahuja1" ref-type="bibr">[15]</xref>.</p><p><italic>Laminaria japonica</italic>, a member of brown algae, is the most important economic seaweed cultured in the Pacific Ocean <xref rid="pone.0094329-Peng1" ref-type="bibr">[16]</xref>. In East Asia, it is widely consumed as a marine vegetable <xref rid="pone.0094329-Li1" ref-type="bibr">[17]</xref>. Moreover, <italic>L. japonica</italic> has been used as an herbal medicine in China to treat goiter, scrofula, and dropsy <xref rid="pone.0094329-Tseng1" ref-type="bibr">[18]</xref>, <xref rid="pone.0094329-Go1" ref-type="bibr">[19]</xref>. However, the use of antimicrobial substances from <italic>L. japonica</italic> as potential inhibitors of <italic>C. michiganense</italic> subsp. <italic>Sepedonicum</italic> has not been investigated. The annual production of <italic>L. japonica</italic> in China is about 900,000 t <xref rid="pone.0094329-Tseng2" ref-type="bibr">[20]</xref>, which would provide a good source for the production of antimicrobial substances. The objectives of the present study were (1) to evaluate the antimicrobial activity of <italic>L. japonica</italic> extracts against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>, and to optimize the extraction of <italic>L. japonica</italic> to yield the maximal antimicrobial activity; (2) to separate and determine the major antimicrobial substances from <italic>L. japonica</italic> against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>; and (3) to investigate the possible mechanism of the antimicrobial action. The results indicated that <italic>L. japonica</italic> has a significant potential for inhibiting <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>.</p></sec><sec id="s2"><title>Results</title><sec id="s2a"><title>Optimization of extraction conditions</title><p>Extracts obtained by methanol, ethanol, acetone, and chloroform showed obvious antimicrobial activities against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>. However, ethyl acetate, butanol, benzene and petroleum ether extracts showed no antimicrobial activity. The ethanol extracts had the highest inhibition zone value and were significantly (<italic>P</italic><0.05) different from those obtained with the other solvents (<xref ref-type="fig" rid="pone-0094329-g001">Figure 1</xref>).</p><fig id="pone-0094329-g001" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.g001</object-id><label>Figure 1</label><caption><title>Antimicrobial activities of eight solvent extracts from <italic>L. japonica</italic> against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>.</title><p>Tests (Figure 1A, B left). DMSO was used as the control (Figure1B right). A negative result is defined as an inhibition zone of 10 mm, while an inhibition zone of greater than 10 mm indicates a positive result. Different letters indicate significant differences (<italic>P</italic><0.05; ANOVA and Duncan’s multiple range test). Bars represent the mean ± standard deviation. Each experiment was replicated four times.</p></caption><graphic xlink:href="pone.0094329.g001"></graphic></fig><p>The effects of the extraction temperature, extraction time, and solid to liquid ratio are depicted in <xref ref-type="fig" rid="pone-0094329-g002">Figure 2</xref>. As shown in <xref ref-type="fig" rid="pone-0094329-g002">Figure 2A</xref>, with an increase in temperature, the diameter of the inhibition zone was increased to a maximum (<italic>P</italic><0.05) at 70°C. However, further increases in the temperature resulted in a decrease in antimicrobial activity. ANOVA analysis indicated that the extraction temperatures at Level 4 (70°C), Level 5 (80°C), and Level 6 (90°C) were significantly (<italic>P</italic><0.05) different; thus, they were selected for orthogonal experimental design as shown in <xref ref-type="table" rid="pone-0094329-t001">Table 1</xref>. As shown in <xref ref-type="fig" rid="pone-0094329-g002">Figure 2B</xref>, the antimicrobial activity increased with an increase in the extraction time. When the extraction time was 8 h, the diameter of the inhibition zone reached a maximum (<italic>P</italic><0.05). With longer extraction times, the antimicrobial activity of <italic>L. japonica</italic> decreased. ANOVA analysis indicated that the extraction times at Level 4 (8 h), Level 5 (10 h), and Level 6 (12 h) were significantly (<italic>P</italic><0.05) different, and thus, they were selected for orthogonal experimental design as shown in <xref ref-type="table" rid="pone-0094329-t001">Table 1</xref>. As shown in <xref ref-type="fig" rid="pone-0094329-g002">Figure 2C</xref>, the solid to liquid ratio influenced the antimicrobial activity of <italic>L. japonica.</italic> The diameter of the inhibition zone increased with an increase in the solid to liquid ratio. The maximum (<italic>P</italic><0.05) extraction yield of antimicrobial substances was achieved at the ratio of 1∶25 while as the amount of solid to liquid increased, the antimicrobial activity decreased. ANOVA analysis indicated that the best (<italic>P</italic><0.05) solid to liquid ratios were Level 3 (1∶20), Level 4 (1∶25), and Level 5 (1∶30); thus, we selected them for orthogonal experimental design as shown in <xref ref-type="table" rid="pone-0094329-t001">Table 1</xref>.</p><fig id="pone-0094329-g002" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.g002</object-id><label>Figure 2</label><caption><title>Effects of extraction temperature (A), extraction time (B), and solid to liquid ratio (C).</title><p>Different letters indicate significant differences (<italic>P</italic><0.05; ANOVA and Duncan’s multiple range test). Bars represent the mean ± standard error. Each experiment was replicated ten times.</p></caption><graphic xlink:href="pone.0094329.g002"></graphic></fig><table-wrap id="pone-0094329-t001" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.t001</object-id><label>Table 1</label><caption><title>Orthogonal design for antimicrobial substance extraction.</title></caption><alternatives><graphic id="pone-0094329-t001-1" xlink:href="pone.0094329.t001"></graphic><table frame="hsides" rules="groups"><colgroup span="1"><col align="left" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col></colgroup><thead><tr><td align="left" rowspan="1" colspan="1">Levels</td><td colspan="3" align="left" rowspan="1">Factors</td></tr><tr><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1">Extraction temperature (A)</td><td align="left" rowspan="1" colspan="1">Extraction time (B)</td><td align="left" rowspan="1" colspan="1">Solid to liquid ratio (C)</td></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">70°C</td><td align="left" rowspan="1" colspan="1">8 h</td><td align="left" rowspan="1" colspan="1">1:20 (g: mL)</td></tr><tr><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">80°C</td><td align="left" rowspan="1" colspan="1">10 h</td><td align="left" rowspan="1" colspan="1">1:25 (g: mL)</td></tr><tr><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">90°C</td><td align="left" rowspan="1" colspan="1">12 h</td><td align="left" rowspan="1" colspan="1">1:30 (g: mL)</td></tr></tbody></table></alternatives></table-wrap><p>Orthogonal experimental design in this study was performed to optimize the extraction temperature, extraction time, and the solid to liquid ratio. From experimental results, we inferred that the antimicrobial activity of <italic>L. japonica</italic> was influenced by varying factors at different levels depending on their interactions. A total of 27 groups of tests were carried out according to the orthogonal table L<sub>27</sub>(3<sup>13</sup>) with three factors and three levels as shown in <xref ref-type="table" rid="pone-0094329-t002">Table 2</xref>. The experimental results are shown in <xref ref-type="table" rid="pone-0094329-t002">Table 2</xref>. Factors that influence the antimicrobial activity of <italic>L. japonica</italic> followed the order: A > B, C (<xref ref-type="table" rid="pone-0094329-t002">Table 2</xref>). The individual levels within each factor were ranked as: A: 2>3>1; B: 3>1>2; C: 2>1>3.</p><table-wrap id="pone-0094329-t002" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.t002</object-id><label>Table 2</label><caption><title>Results obtained under the experimental conditions using L<sub>27</sub> (3<sup>13</sup>) orthogonal array design.</title></caption><alternatives><graphic id="pone-0094329-t002-2" xlink:href="pone.0094329.t002"></graphic><table frame="hsides" rules="groups"><colgroup span="1"><col align="left" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col></colgroup><thead><tr><td align="left" rowspan="1" colspan="1">Test</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">4</td><td align="left" rowspan="1" colspan="1">5</td><td align="left" rowspan="1" colspan="1">6</td><td align="left" rowspan="1" colspan="1">7</td><td align="left" rowspan="1" colspan="1">8</td><td align="left" rowspan="1" colspan="1">9</td><td align="left" rowspan="1" colspan="1">10</td><td align="left" rowspan="1" colspan="1">11</td><td align="left" rowspan="1" colspan="1">12</td><td align="left" rowspan="1" colspan="1">13</td><td align="left" rowspan="1" colspan="1">Inhibition zone (mm) <xref ref-type="table-fn" rid="nt102">a</xref></td></tr><tr><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1">A</td><td align="left" rowspan="1" colspan="1">B</td><td align="left" rowspan="1" colspan="1">A×B</td><td align="left" rowspan="1" colspan="1">A×B</td><td align="left" rowspan="1" colspan="1">C</td><td align="left" rowspan="1" colspan="1">A×C</td><td align="left" rowspan="1" colspan="1">A×C</td><td align="left" rowspan="1" colspan="1">B×C</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1">B×C</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1 (70°C)</td><td align="left" rowspan="1" colspan="1">1 (8 h)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1 (1:20)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">16.05± 1.23</td></tr><tr><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1 (70°C)</td><td align="left" rowspan="1" colspan="1">1 (8 h)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2 (1:25)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">16.73± 0.92</td></tr><tr><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1 (70°C)</td><td align="left" rowspan="1" colspan="1">1 (8 h)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3 (1:30)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">16.32±1.25</td></tr><tr><td align="left" rowspan="1" colspan="1">4</td><td align="left" rowspan="1" colspan="1">1 (70°C)</td><td align="left" rowspan="1" colspan="1">2 (10 h)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1 (1:20)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">16.58± 1.07</td></tr><tr><td align="left" rowspan="1" colspan="1">5</td><td align="left" rowspan="1" colspan="1">1 (70°C)</td><td align="left" rowspan="1" colspan="1">2 (10 h)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2 (1:25)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">19.01±1.12</td></tr><tr><td align="left" rowspan="1" colspan="1">6</td><td align="left" rowspan="1" colspan="1">1 (70°C)</td><td align="left" rowspan="1" colspan="1">2 (10 h)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3 (1:30)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">17.54± 1.23</td></tr><tr><td align="left" rowspan="1" colspan="1">7</td><td align="left" rowspan="1" colspan="1">1 (70°C)</td><td align="left" rowspan="1" colspan="1">3 (12 h)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1 (1:20)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">17.72± 1.40</td></tr><tr><td align="left" rowspan="1" colspan="1">8</td><td align="left" rowspan="1" colspan="1">1 (70°C)</td><td align="left" rowspan="1" colspan="1">3 (12 h)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2 (1:25)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">18.07± 1.41</td></tr><tr><td align="left" rowspan="1" colspan="1">9</td><td align="left" rowspan="1" colspan="1">1 (70°C)</td><td align="left" rowspan="1" colspan="1">3 (12 h)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3 (1:30)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">18.58± 1.47</td></tr><tr><td align="left" rowspan="1" colspan="1">10</td><td align="left" rowspan="1" colspan="1">2 (80°C)</td><td align="left" rowspan="1" colspan="1">1 (8 h)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1 (1:20)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">19.43± 1.10</td></tr><tr><td align="left" rowspan="1" colspan="1">11</td><td align="left" rowspan="1" colspan="1">2 (80°C)</td><td align="left" rowspan="1" colspan="1">1 (8 h)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2 (1:25)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">19.71± 1.07</td></tr><tr><td align="left" rowspan="1" colspan="1">12</td><td align="left" rowspan="1" colspan="1">2 (80°C)</td><td align="left" rowspan="1" colspan="1">1 (8 h)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3 (1:30)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">17.25± 1.31</td></tr><tr><td align="left" rowspan="1" colspan="1">13</td><td align="left" rowspan="1" colspan="1">2 (80°C)</td><td align="left" rowspan="1" colspan="1">2 (10 h)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1 (1:20)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">19.20±1.38</td></tr><tr><td align="left" rowspan="1" colspan="1">14</td><td align="left" rowspan="1" colspan="1">2 (80°C)</td><td align="left" rowspan="1" colspan="1">2 (10 h)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2 (1:25)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">17.93± 1.56</td></tr><tr><td align="left" rowspan="1" colspan="1">15</td><td align="left" rowspan="1" colspan="1">2 (80°C)</td><td align="left" rowspan="1" colspan="1">2 (10 h)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3 (1:30)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">18.58± 1.36</td></tr><tr><td align="left" rowspan="1" colspan="1">16</td><td align="left" rowspan="1" colspan="1">2 (80°C)</td><td align="left" rowspan="1" colspan="1">3 (12 h)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1 (1:20)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">17.96± 2.09</td></tr><tr><td align="left" rowspan="1" colspan="1">17</td><td align="left" rowspan="1" colspan="1">2 (80°C)</td><td align="left" rowspan="1" colspan="1">3 (12 h)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2 (1:25)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">18.94± 2.17</td></tr><tr><td align="left" rowspan="1" colspan="1">18</td><td align="left" rowspan="1" colspan="1">2 (80°C)</td><td align="left" rowspan="1" colspan="1">3 (12 h)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3 (1:30)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">18.24± 1.36</td></tr><tr><td align="left" rowspan="1" colspan="1">19</td><td align="left" rowspan="1" colspan="1">3 (90°C)</td><td align="left" rowspan="1" colspan="1">1 (8 h)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1 (1:20)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">18.13± 0.78</td></tr><tr><td align="left" rowspan="1" colspan="1">20</td><td align="left" rowspan="1" colspan="1">3 (90°C)</td><td align="left" rowspan="1" colspan="1">1 (8 h)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2 (1:25)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">18.84± 2.05</td></tr><tr><td align="left" rowspan="1" colspan="1">21</td><td align="left" rowspan="1" colspan="1">3 (90°C)</td><td align="left" rowspan="1" colspan="1">1 (8 h)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3 (1:30)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">19.45± 0.95</td></tr><tr><td align="left" rowspan="1" colspan="1">22</td><td align="left" rowspan="1" colspan="1">3 (90°C)</td><td align="left" rowspan="1" colspan="1">2 (10 h)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1 (1:20)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">17.18± 1.98</td></tr><tr><td align="left" rowspan="1" colspan="1">23</td><td align="left" rowspan="1" colspan="1">3 (90°C)</td><td align="left" rowspan="1" colspan="1">2 (10 h)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2 (1:25)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">18.03± 1.00</td></tr><tr><td align="left" rowspan="1" colspan="1">24</td><td align="left" rowspan="1" colspan="1">3 (90°C)</td><td align="left" rowspan="1" colspan="1">2 (10 h)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">3 (1:30)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">16.25± 1.29</td></tr><tr><td align="left" rowspan="1" colspan="1">25</td><td align="left" rowspan="1" colspan="1">3 (90°C)</td><td align="left" rowspan="1" colspan="1">3 (12 h)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">1 (1:20)</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">18.66± 1.20</td></tr><tr><td align="left" rowspan="1" colspan="1">26</td><td align="left" rowspan="1" colspan="1">3 (90°C)</td><td align="left" rowspan="1" colspan="1">3 (12 h)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2 (1:25)</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">19.04± 1.79</td></tr><tr><td align="left" rowspan="1" colspan="1">27</td><td align="left" rowspan="1" colspan="1">3 (90°C)</td><td align="left" rowspan="1" colspan="1">3 (12 h)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3 (1:30)</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">18.61± 2.02</td></tr><tr><td align="left" rowspan="1" colspan="1"><italic>K</italic><sub>1<italic>j</italic></sub><xref ref-type="table-fn" rid="nt103">b</xref></td><td align="left" rowspan="1" colspan="1">17.40</td><td align="left" rowspan="1" colspan="1">17.99</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1">17.88</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1">∑488.03</td></tr><tr><td align="left" rowspan="1" colspan="1"><italic>K</italic><sub>2<italic>j</italic></sub></td><td align="left" rowspan="1" colspan="1">18.58</td><td align="left" rowspan="1" colspan="1">17.81</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1">18.48</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td></tr><tr><td align="left" rowspan="1" colspan="1"><italic>K<sub>3j</sub></italic></td><td align="left" rowspan="1" colspan="1">18.24</td><td align="left" rowspan="1" colspan="1">18.42</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1">17.87</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td></tr><tr><td align="left" rowspan="1" colspan="1"><italic>R</italic><xref ref-type="table-fn" rid="nt104">c</xref></td><td align="left" rowspan="1" colspan="1">1.18</td><td align="left" rowspan="1" colspan="1">0.61</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1">0.61</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td></tr></tbody></table></alternatives><table-wrap-foot><fn id="nt101"><label></label><p>A represented the factor of extraction temperature(°C), B represented the factor of extraction time (h), and C represented the factor of solid to liquid ratio (g: mL).</p></fn><fn id="nt102"><label>a</label><p>DMSO was used as control. A negative result was defined as an inhibition zone of 10 mm. Greater than 10 mm indicated positive result of the presence of antimicrobial substance. Each value was mean and standard deviation (S.D.) of twelve replications.</p></fn><fn id="nt103"><label>b</label><p><italic>K<sub>ij</sub></italic> = (1/9) ∑ mean inhibition zone of <italic>L. japonica</italic> at factor <italic>j</italic> (<italic>j</italic> = A, B, C).</p></fn><fn id="nt104"><label>c</label><p><italic>R<sub>ij</sub></italic> = max {<italic>K<sub>ij</sub></italic>}−min {<italic>K<sub>ij</sub></italic>}, <italic>j</italic> and <italic>i</italic> mean factor and setting level here, respectively.</p></fn></table-wrap-foot></table-wrap><p>Because interactions between factors are complex, only low–order interactions were analyzed while high–order (three–, four–, and five–order) interactions were neglected. In <xref ref-type="table" rid="pone-0094329-t003">Table 3</xref>, the term ‘‘interaction’’, indicated by inserting the ‘‘×’’ symbol between the two interacting factors, is used to describe the condition in which the effect of one factor’s influence upon the result is dependent on the condition of the other factor. In <xref ref-type="table" rid="pone-0094329-t003">Table 3</xref>, if the significant level, α, was 0.05, then A (temperature), and A×B (interaction of temperature and extraction time) have significant influence on the antimicrobial activity of <italic>L. japonica</italic>. Therefore, factor A and the interaction A×B were regarded as a dependent factor and interaction in the extraction of antimicrobial substances. B (extraction time), C (solid to liquid ratio) and interactions A×C, B×C, were regarded as independent factors and interactions. As seen from the result in <xref ref-type="table" rid="pone-0094329-t002">Table 2</xref>, the factors that gave the optimal extraction level were A<sub>2</sub>B<sub>3</sub>C<sub>2</sub>, in other words, the optimum conditions for extracting antimicrobial substances from <italic>L. japonica</italic> were 80°C, an extraction time 12 h, and a solid to liquid ratio of 1∶25</p><table-wrap id="pone-0094329-t003" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.t003</object-id><label>Table 3</label><caption><title>Results of variance (ANOVA) analysis.</title></caption><alternatives><graphic id="pone-0094329-t003-3" xlink:href="pone.0094329.t003"></graphic><table frame="hsides" rules="groups"><colgroup span="1"><col align="left" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col></colgroup><thead><tr><td align="left" rowspan="1" colspan="1">Source</td><td align="left" rowspan="1" colspan="1">SS</td><td align="left" rowspan="1" colspan="1"><italic>df</italic></td><td align="left" rowspan="1" colspan="1">MS</td><td align="left" rowspan="1" colspan="1"><italic>F</italic><xref ref-type="table-fn" rid="nt105">a</xref></td><td align="left" rowspan="1" colspan="1">Significance<italic><sup>b</sup></italic></td></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">A</td><td align="left" rowspan="1" colspan="1">6.67</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3.34</td><td align="left" rowspan="1" colspan="1">5.14</td><td align="left" rowspan="1" colspan="1">*</td></tr><tr><td align="left" rowspan="1" colspan="1">A×B</td><td align="left" rowspan="1" colspan="1">8.88</td><td align="left" rowspan="1" colspan="1">4</td><td align="left" rowspan="1" colspan="1">2.22</td><td align="left" rowspan="1" colspan="1">3.42</td><td align="left" rowspan="1" colspan="1">*</td></tr><tr><td align="left" rowspan="1" colspan="1">Error</td><td align="left" rowspan="1" colspan="1">12.91</td><td align="left" rowspan="1" colspan="1">20</td><td align="left" rowspan="1" colspan="1">0.65</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td></tr><tr><td align="left" rowspan="1" colspan="1">Total</td><td align="left" rowspan="1" colspan="1">28.46</td><td align="left" rowspan="1" colspan="1">26</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td></tr></tbody></table></alternatives><table-wrap-foot><fn id="nt105"><label>a</label><p>Significant parameter, <italic>F</italic><sub>0.05</sub> (2, 20) = 3.49, <italic>F</italic><sub>0.05</sub> (4, 20) = 2.87. <italic><sup>b</sup></italic> *indicate significant different.</p></fn></table-wrap-foot></table-wrap></sec><sec id="s2b"><title>Determination of the major inhibitory substances</title><p>At 1 mg/mL, the petroleum ether fraction showed the highest antimicrobial activity. Hence, the petroleum ether fraction was subjected to subsequent analysis. To select a mobile phase for silica gel column chromatography, a thin layer chromatography (TLC) method was performed. Among the twenty solvent systems tested, petroleum ether/ethyl acetate (2∶1) could be used to separate up to seven spots (<xref ref-type="fig" rid="pone-0094329-g003">Figure 3A</xref>). Therefore, we selected petroleum ether/ethyl acetate as the mobile phase for silica gel column chromatography. The petroleum ether fraction was subjected to silica gel column chromatography with petroleum ether/ethyl acetate as the eluent, and the polarity was slowly increased to pure ethyl acetate. Nineteen fractionations were isolated from the petroleum ether fraction, and Fractionation three (Fr.3) showed the highest (<italic>P</italic><0.05) antimicrobial activity against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> (<xref ref-type="fig" rid="pone-0094329-g003">Figure 3B</xref>). Fr.3 obtained from the first step of column chromatography (petroleum ether/ethyl acetate 100: 3 (v/v)) was subjected to a second round of chromatography. However, the sub–fractionations obtained from the second round of chromatography did not show higher inhibitory activities against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>, than Fr.3. Hence, Fr.3 was subjected to subsequent chemical composition analysis.</p><fig id="pone-0094329-g003" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.g003</object-id><label>Figure 3</label><caption><title>Major inhibitory substance determination.</title><p>Thin layer chromatography (TLC) pattern of petroleum ether partition from <italic>L. japonica</italic> alcoholic extracts developed in twenty solvent systems (A). Inhibitory activities of nineteen fractionations isolated from the petroleum ether partition (B). Gas chromatography–mass spectroscopy (GC–MS) of Fractionation three (C). A negative result is defined as an inhibition zone of 10 mm, while an inhibition zone of greater than 10 mm indicates a positive result in the presence of inhibitory substance. Different letters indicate a significant difference (<italic>P</italic><0.05; ANOVA and Duncan’s multiple range test). Bars represent the mean ± standard deviation. Each experiment was replicated five times. Fr., Fractionation.</p></caption><graphic xlink:href="pone.0094329.g003"></graphic></fig><p>Analysis of chemical composition by gas chromatography–mass spectroscopy (GC–MS) identified a total of 26 components, representing 94.48% of Fr.3 (<xref ref-type="table" rid="pone-0094329-t004">Table 4</xref>, <xref ref-type="fig" rid="pone-0094329-g003">Figure 3C</xref>). These components were classified into six different classes, including 11 alkanes, 5 esters, 5 acids, 3 alcohols, 1 phenol and 1 anhydride. The major components were pentacosane (11.97%), heptacosane (10.71%), tetratriacontane (10.22%), hentriacontane (10.07%), nonacosane (9.68%), octacosane (7.57%), hexatriacontane (7.32%), tetratetracontane (5.88%) and docosane (4.04%). In summary, Fr.3 contained high amounts of alkanes (80.97%), esters (5.24%), acids (4.87%) and alcohols (2.21%).</p><table-wrap id="pone-0094329-t004" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.t004</object-id><label>Table 4</label><caption><title>The main constituents of Fractionation three determined by gas chromatography–mass spectroscopy (GC–MS) analysis.</title></caption><alternatives><graphic id="pone-0094329-t004-4" xlink:href="pone.0094329.t004"></graphic><table frame="hsides" rules="groups"><colgroup span="1"><col align="left" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col></colgroup><thead><tr><td align="left" rowspan="1" colspan="1">Peak number</td><td align="left" rowspan="1" colspan="1">Compound <xref ref-type="table-fn" rid="nt106">a</xref></td><td align="left" rowspan="1" colspan="1">Retention time (min)</td><td align="left" rowspan="1" colspan="1">Molecular formula</td><td align="left" rowspan="1" colspan="1">Chemical composition (%) <italic><sup>b</sup></italic></td></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">Tert-hexadecanethiol</td><td align="left" rowspan="1" colspan="1">9.10</td><td align="left" rowspan="1" colspan="1">C<sub>16</sub>H<sub>34</sub>S</td><td align="left" rowspan="1" colspan="1">0.35</td></tr><tr><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3-Ethyl-5-(2-ethylbutyl) octadecane</td><td align="left" rowspan="1" colspan="1">9.69</td><td align="left" rowspan="1" colspan="1">C<sub>26</sub>H<sub>54</sub></td><td align="left" rowspan="1" colspan="1">1.64</td></tr><tr><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">Dodeceny succinicanhydride</td><td align="left" rowspan="1" colspan="1">10.13</td><td align="left" rowspan="1" colspan="1">C<sub>16</sub>H<sub>26</sub>O<sub>3</sub></td><td align="left" rowspan="1" colspan="1">0.32</td></tr><tr><td align="left" rowspan="1" colspan="1">4</td><td align="left" rowspan="1" colspan="1">1-Phenylpentadecane</td><td align="left" rowspan="1" colspan="1">10.74</td><td align="left" rowspan="1" colspan="1">C<sub>21</sub>H<sub>36</sub></td><td align="left" rowspan="1" colspan="1">1.87</td></tr><tr><td align="left" rowspan="1" colspan="1">5</td><td align="left" rowspan="1" colspan="1">1-Heptatriacotanol</td><td align="left" rowspan="1" colspan="1">11.30</td><td align="left" rowspan="1" colspan="1">C<sub>37</sub>H<sub>76</sub>O</td><td align="left" rowspan="1" colspan="1">0.68</td></tr><tr><td align="left" rowspan="1" colspan="1">6</td><td align="left" rowspan="1" colspan="1">Diisononyl phthalate</td><td align="left" rowspan="1" colspan="1">11.56</td><td align="left" rowspan="1" colspan="1">C<sub>26</sub>H<sub>42</sub>O<sub>4</sub></td><td align="left" rowspan="1" colspan="1">1.63</td></tr><tr><td align="left" rowspan="1" colspan="1">7</td><td align="left" rowspan="1" colspan="1">Gibberellic acid</td><td align="left" rowspan="1" colspan="1">11.73</td><td align="left" rowspan="1" colspan="1">C<sub>19</sub>H<sub>22</sub>O<sub>6</sub></td><td align="left" rowspan="1" colspan="1">0.98</td></tr><tr><td align="left" rowspan="1" colspan="1">8</td><td align="left" rowspan="1" colspan="1">Linoleic acid ethyl ester</td><td align="left" rowspan="1" colspan="1">12.09</td><td align="left" rowspan="1" colspan="1">C<sub>20</sub>H<sub>36</sub>O<sub>2</sub></td><td align="left" rowspan="1" colspan="1">0.47</td></tr><tr><td align="left" rowspan="1" colspan="1">9</td><td align="left" rowspan="1" colspan="1">Benzenepropanoic acid, 4-hydroxy-, [(4S)-2,2-dimethyl-1,3-dioxolan-4-yl]methyl ester</td><td align="left" rowspan="1" colspan="1">12.54</td><td align="left" rowspan="1" colspan="1">C<sub>15</sub>H<sub>20</sub>O<sub>5</sub></td><td align="left" rowspan="1" colspan="1">0.63</td></tr><tr><td align="left" rowspan="1" colspan="1">10</td><td align="left" rowspan="1" colspan="1">Alatolide</td><td align="left" rowspan="1" colspan="1">12.69</td><td align="left" rowspan="1" colspan="1">C<sub>19</sub>H<sub>26</sub>O<sub>6</sub></td><td align="left" rowspan="1" colspan="1">2.03</td></tr><tr><td align="left" rowspan="1" colspan="1">11</td><td align="left" rowspan="1" colspan="1">Methyl abietate</td><td align="left" rowspan="1" colspan="1">12.91</td><td align="left" rowspan="1" colspan="1">C<sub>21</sub>H<sub>32</sub>O<sub>2</sub></td><td align="left" rowspan="1" colspan="1">0.48</td></tr><tr><td align="left" rowspan="1" colspan="1">12</td><td align="left" rowspan="1" colspan="1">Ursodeoxycholic acid</td><td align="left" rowspan="1" colspan="1">13.08</td><td align="left" rowspan="1" colspan="1">C<sub>24</sub>H<sub>40</sub>O<sub>4</sub></td><td align="left" rowspan="1" colspan="1">0.42</td></tr><tr><td align="left" rowspan="1" colspan="1">13</td><td align="left" rowspan="1" colspan="1">Docosane</td><td align="left" rowspan="1" colspan="1">13.63</td><td align="left" rowspan="1" colspan="1">C<sub>22</sub>H<sub>46</sub></td><td align="left" rowspan="1" colspan="1">4.04</td></tr><tr><td align="left" rowspan="1" colspan="1">14</td><td align="left" rowspan="1" colspan="1">Squalene-2, 3-diol</td><td align="left" rowspan="1" colspan="1">14.30</td><td align="left" rowspan="1" colspan="1">C<sub>30</sub>H<sub>52</sub>O<sub>2</sub></td><td align="left" rowspan="1" colspan="1">1.18</td></tr><tr><td align="left" rowspan="1" colspan="1">15</td><td align="left" rowspan="1" colspan="1">Octacosane</td><td align="left" rowspan="1" colspan="1">14.52</td><td align="left" rowspan="1" colspan="1">C<sub>28</sub>H<sub>58</sub></td><td align="left" rowspan="1" colspan="1">7.57</td></tr><tr><td align="left" rowspan="1" colspan="1">16</td><td align="left" rowspan="1" colspan="1">Hentriacontane</td><td align="left" rowspan="1" colspan="1">15.47</td><td align="left" rowspan="1" colspan="1">C<sub>31</sub>H<sub>64</sub></td><td align="left" rowspan="1" colspan="1">10.07</td></tr><tr><td align="left" rowspan="1" colspan="1">17</td><td align="left" rowspan="1" colspan="1">Heptacosane</td><td align="left" rowspan="1" colspan="1">16.60</td><td align="left" rowspan="1" colspan="1">C<sub>27</sub>H<sub>54</sub></td><td align="left" rowspan="1" colspan="1">10.71</td></tr><tr><td align="left" rowspan="1" colspan="1">18</td><td align="left" rowspan="1" colspan="1">2,2'-Methylenebis(6-tert-butyl-4-methylphenol)</td><td align="left" rowspan="1" colspan="1">17.14</td><td align="left" rowspan="1" colspan="1">C<sub>23</sub>H<sub>32</sub>O<sub>2</sub></td><td align="left" rowspan="1" colspan="1">0.87</td></tr><tr><td align="left" rowspan="1" colspan="1">19</td><td align="left" rowspan="1" colspan="1">3,3,3-Triphenylpropionic acid</td><td align="left" rowspan="1" colspan="1">17.38</td><td align="left" rowspan="1" colspan="1">C<sub>21</sub>H<sub>18</sub>O<sub>2</sub></td><td align="left" rowspan="1" colspan="1">2.21</td></tr><tr><td align="left" rowspan="1" colspan="1">20</td><td align="left" rowspan="1" colspan="1">Pentacosane</td><td align="left" rowspan="1" colspan="1">17.98</td><td align="left" rowspan="1" colspan="1">C<sub>25</sub>H<sub>52</sub></td><td align="left" rowspan="1" colspan="1">11.97</td></tr><tr><td align="left" rowspan="1" colspan="1">21</td><td align="left" rowspan="1" colspan="1">Abietic acid</td><td align="left" rowspan="1" colspan="1">18.54</td><td align="left" rowspan="1" colspan="1">C<sub>20</sub>H<sub>30</sub>O<sub>2</sub></td><td align="left" rowspan="1" colspan="1">0.85</td></tr><tr><td align="left" rowspan="1" colspan="1">22</td><td align="left" rowspan="1" colspan="1">(Z,Z,Z)-9,12,15-Octadecatrienoic acid</td><td align="left" rowspan="1" colspan="1">19.02</td><td align="left" rowspan="1" colspan="1">C<sub>18</sub>H<sub>30</sub>O<sub>2</sub></td><td align="left" rowspan="1" colspan="1">0.41</td></tr><tr><td align="left" rowspan="1" colspan="1">23</td><td align="left" rowspan="1" colspan="1">Tetratriacontane</td><td align="left" rowspan="1" colspan="1">19.75</td><td align="left" rowspan="1" colspan="1">C<sub>34</sub>H<sub>70</sub></td><td align="left" rowspan="1" colspan="1">10.22</td></tr><tr><td align="left" rowspan="1" colspan="1">24</td><td align="left" rowspan="1" colspan="1">Nonacosane</td><td align="left" rowspan="1" colspan="1">22.01</td><td align="left" rowspan="1" colspan="1">C<sub>29</sub>H<sub>60</sub></td><td align="left" rowspan="1" colspan="1">9.68</td></tr><tr><td align="left" rowspan="1" colspan="1">25</td><td align="left" rowspan="1" colspan="1">Hexatriacontane</td><td align="left" rowspan="1" colspan="1">24.94</td><td align="left" rowspan="1" colspan="1">C<sub>36</sub>H<sub>74</sub></td><td align="left" rowspan="1" colspan="1">7.32</td></tr><tr><td align="left" rowspan="1" colspan="1">26</td><td align="left" rowspan="1" colspan="1">Tetratetracontane</td><td align="left" rowspan="1" colspan="1">28.76</td><td align="left" rowspan="1" colspan="1">C<sub>44</sub>H<sub>90</sub></td><td align="left" rowspan="1" colspan="1">5.88</td></tr></tbody></table></alternatives><table-wrap-foot><fn id="nt106"><label>a</label><p>All constituents were tentatively identified. <italic><sup>b</sup></italic> Relative area (peak area relative to the total peak area).</p></fn></table-wrap-foot></table-wrap></sec><sec id="s2c"><title>Investigation of the Inhibition Mechanism</title><sec id="s2c1"><title>Minimum inhibitory concentration (MIC) determination</title><p>The MIC of Fr.3 against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> was determined by the agar diffusion method (ADM). As shown in <xref ref-type="fig" rid="pone-0094329-g004">Figure 4</xref>, Fr.3 was effective in inhibiting the growth of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> when tested at 0.64 mg/mL, 0.32 mg/mL, 0.16 mg/mL, 0.08 mg/mL and 0.04 mg/mL, compared to the control (<italic>P</italic><0.05; <xref ref-type="fig" rid="pone-0094329-g004">Figure 4</xref>). There were no statistically significant (<italic>P</italic><0.05) differences between the 0.02 mg/mL, 0.01 mg/mL, 0.005 mg/mL samples and the negative control, dimethyl sulphoxide (DMSO). These data indicated that Fr.3 exhibited concentration–dependent inhibition of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> growth. Fr.3 at 0.04 mg/mL was enough to inhibit the growth of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>. Thus, the MIC of Fr.3 against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> was 0.04 mg/mL.</p><fig id="pone-0094329-g004" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.g004</object-id><label>Figure 4</label><caption><title>Inhibitory effects of Fractionation three at different concentrations against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>.</title><p>DMSO was used as the control. A negative result is defined as an inhibition zone of 10(<italic>P</italic><0.05; ANOVA and Duncan’s multiple range test). Bars represent the mean ± standard deviation. Each experiment was replicated four times.</p></caption><graphic xlink:href="pone.0094329.g004"></graphic></fig></sec><sec id="s2c2"><title>Growth curve</title><p>The result of bactericidal kinetic assay is presented as a log<sub>10</sub> cfu/mL change (<xref ref-type="fig" rid="pone-0094329-g005">Figure 5</xref>). Compared to the control, a lower concentration of Fr.3 (1/2MIC concentration) demonstrated a weaker inhibitory effect during a 24 h period. At the MIC and 2MIC, Fr.3 suppressed the growth of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> significantly following a 2 h exposure. A clear correlation was observed between the concentration of Fr.3 and its inhibitory activity.</p><fig id="pone-0094329-g005" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.g005</object-id><label>Figure 5</label><caption><title>Growth curves of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> in the presence and absence of Fractionation three.</title><p>MIC, Minimum inhibitory concentration.</p></caption><graphic xlink:href="pone.0094329.g005"></graphic></fig></sec><sec id="s2c3"><title>Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations</title><p>SEM and TEM are suitable tools for investigation of the morphology and microstructure of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic><xref rid="pone.0094329-Wu1" ref-type="bibr">[21]</xref>. A SEM study was used to examine any surface alterations and or general morphological changes of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> after exposure to Fr.3. All the control cells of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> were generally smooth–walled bodies, spherical in shape and were separated from each other. (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6A</xref>). Microscopic observation of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> exposed to Fr.3 at the MIC (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6B</xref>) showed severe changes compared to the control. Some damaged cells showed intracellular constituent leakage (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6B:</xref> 1), while others were misshapen (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6B:</xref> 3). The damaged cell surfaces became roughened (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6B:</xref> 5) and were decorated with blebs (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6B:</xref> 4). In addition, some cells were observed to clump (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6B:</xref> 2). It was clearly observed that the number of the damaged cells treated with Fr.3 (2MIC concentration) was significantly greater than that in the control (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6C</xref>). Damaged cells showed significant leakage (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6C:</xref> 6, 12, 13), surface collapse (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6C:</xref> 7, 8, 10, 11, 12), were fragmented (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6C:</xref> 9), clumped (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6C:</xref> 7, 8, 11, 12), swollen (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6C:</xref> 7, 8, 10, 12), had a disrupted cytoplasmic membrane (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6C:</xref> 8, 10, 11, 12), or were completely lysed (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6C:</xref> 9). The internal structure of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> treated with Fr.3 was observed with TEM. The untreated <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> cells retained their connatural morphology (regular outlined cell wall, plasma lemma lying closely to the cell wall, and regularly distributed cytoplasm) and seemed to be normal (<xref ref-type="fig" rid="pone-0094329-g007">Figure 7A–B</xref>). In contrast, <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> treated with Fr.3 (MIC concentration) exhibited a wide range of abnormalities (<xref ref-type="fig" rid="pone-0094329-g007">Figure 7</xref> C–I). At the MIC, the treated cells contained small vacuoles (<xref ref-type="fig" rid="pone-0094329-g007">Figure 7C</xref>). At certain locations, the leakage of intracellular content because of cell wall and cell membrane damage was also observed (<xref ref-type="fig" rid="pone-0094329-g007">Figure 7D:</xref> 1; <xref ref-type="fig" rid="pone-0094329-g007">Figure 7E:</xref> 3). The cytoplasm was separated from the cell wall and cell membrane (<xref ref-type="fig" rid="pone-0094329-g007">Figure 7F:</xref> 4; <xref ref-type="fig" rid="pone-0094329-g007">Figure 7G:</xref> 5). Furthermore, the damaged cells also contained some large vacuoles (<xref ref-type="fig" rid="pone-0094329-g007">Figure 7D:</xref> 2; <xref ref-type="fig" rid="pone-0094329-g007">Figure 7H:</xref> 6; <xref ref-type="fig" rid="pone-0094329-g007">Figure 7I:</xref> 7), which were rarely observed in control cells.</p><fig id="pone-0094329-g006" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.g006</object-id><label>Figure 6</label><caption><title>Scanning electron micrographs (SEM) of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> cells.</title><p>Untreated (A, 10000×); treated with Fractionation three at the MIC concentration (B, 10000×), and treated at 2MIC concentration (C, 10000×). Extracellular leakage of cell content (1, 6, 12, 13), cells gathered into “clumps”(2, 7, 8, 11, 12), misshapen cells (3), blebs of damaged cells (4), roughened cell surfaces (5), collapsed surfaces (7, 8, 10, 11, 12), fragmentation (9), swollen cells (7, 8, 10, 12), disrupted cytoplasmic membrane (8, 10, 11, 12), and cell lysis (9). MIC, Minimum inhibitory concentration.</p></caption><graphic xlink:href="pone.0094329.g006"></graphic></fig><fig id="pone-0094329-g007" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.g007</object-id><label>Figure 7</label><caption><title>Transmission electron micrographs (TEM) of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> cells.</title><p>Untreated (A, 20000×; B, 120000×); treated with Fractionation three at the MIC concentration (C, 20000×; D, F, G, H, 100000×; E, 120000×; I, 80000×). Disintegration of cell wall (1, 3), cytoplasm separated from cell wall and cell membrane (4, 5), large vacuoles inside the cells (2, 6, 7). MIC, Minimum inhibitory concentration.</p></caption><graphic xlink:href="pone.0094329.g007"></graphic></fig></sec><sec id="s2c4"><title>Integrity of the cell wall and cell membrane</title><p>Alkaline phosphatase (AKP) was used to determine the effect of Fr.3 on the cell wall. As shown in <xref ref-type="fig" rid="pone-0094329-g008">Figure 8A</xref>, there were no significant differences between the control, and treatments at 1/5MIC, 1/2MIC, or the MIC. However, a significant (<italic>P</italic><0.05) difference in AKP activity was observed when the cells were treated with Fr.3 at 2MIC for 6 h, 8 h and 10 h. The result indicated that Fr.3 had an effect on the cell wall permeability. <xref ref-type="fig" rid="pone-0094329-g008">Figure 8B</xref> shows the leakage of nucleotides from the <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> cells treated with Fr.3. There were no significant differences between the control and treatment at 1/5MIC. However, when the concentration of Fr.3 increased to the MIC and 2MIC, OD values at 260 nm were all significantly (<italic>P</italic><0.05) higher than the control. A significant correlation was found between the concentration of Fr.3 and OD value at 260 nm. The result indicated that Fr.3 had an effect on the membrane permeability of the <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>, and the effect was dose–dependent. In <xref ref-type="fig" rid="pone-0094329-g008">Figure 8C</xref>, dissipation of the membrane potential by Fr.3 treatment was clearly evident from flow cytometry analyses. After 8 h, the fluorescence value of the control was 361.51, whereas it was 300.75 for the 1/5MIC group, 182.92 for the 1/2MIC group, 168.98 for the MIC group, and was only 133.69 for the 2MIC group. The result clearly indicated that the membrane potential is disrupted after Fr.3 treatment.</p><fig id="pone-0094329-g008" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.g008</object-id><label>Figure 8</label><caption><title>Effects of Fractionation three on the cell wall and cell membrane permeability.</title><p>Effect of Fractionation three on the alkaline phosphatase (AKP) activity of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> (A). Effect of Fractionation three on the leakage of nucleotides from <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> (B). Cell membrane depolarization in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> cells treated with Fractionation three (C). Proposed mechanism of cell wall and cell membrane disruption by Fractionation three treatment (D). Different letters indicated a significant difference (<italic>P</italic><0.05; ANOVA and Duncan’s multiple range test). Bars represent the mean ± standard deviation. Each experiment was replicated three times. Analysis of cell membrane potential by flow cytometry (C left panel) and fluorescence microscopy (C right panel, 20×). MIC, Minimum inhibitory concentration; Fr.3, Fractionation three.</p></caption><graphic xlink:href="pone.0094329.g008"></graphic></fig></sec><sec id="s2c5"><title>Effects of Fr.3 on reactive oxygen species (ROS), superoxide dismutase (SOD), and catalase (CAT)</title><p>Compared with the control group, higher (<italic>P</italic><0.05) levels of ROS were found in the MIC and 2MIC groups (<xref ref-type="fig" rid="pone-0094329-g009">Figure 9A</xref>). An increase in the concentration led to greater SOD activity, and the highest SOD activity with a significant (<italic>P</italic><0.05) difference was observed for the 1/2MIC group. However, increasing the concentration to the 2MIC did not improve the SOD activity (<xref ref-type="fig" rid="pone-0094329-g009">Figure 9B</xref>). Treatment with Fr.3 (1/5MIC, 1/2MIC, MIC, and 2MIC) resulted in a statistically significant (<italic>P</italic><0.05) decrease in the CAT activity compared to the control (<xref ref-type="fig" rid="pone-0094329-g009">Figure 9C</xref>).</p><fig id="pone-0094329-g009" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.g009</object-id><label>Figure 9</label><caption><title>Measurement of reactive oxygen species (A), superoxide dismutase (B) and catalase (C).</title><p>Cells without Fractionation three treatment were used as the control. Different letters indicated a significant difference (<italic>P</italic><0.05; ANOVA and Duncan’s multiple range test). Bars represent the mean ± standard deviation. Each experiment was replicated three times. MIC, Minimum inhibitory concentration; ROS, reactive oxygen species; SOD, superoxide dismutase; CAT, catalase.</p></caption><graphic xlink:href="pone.0094329.g009"></graphic></fig></sec><sec id="s2c6"><title>Fr.3 increases the cytosolic Ca<sup>2+</sup> level in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic></title><p>Fluo3–AM is a Ca<sup>2+</sup> indicator which, when combined with Ca<sup>2+</sup>, yields a fluorescence output that corresponds to intracellular Ca<sup>2+</sup><xref rid="pone.0094329-Schepers1" ref-type="bibr">[22]</xref>. As shown in <xref ref-type="fig" rid="pone-0094329-g010">Figure 10</xref>, the fluorescence intensity of the control group was 53.52, whereas it was 58.15 for the 1/5MIC group, 66.36 for the 1/2MIC group, and 89.36 for the MIC group, respectively. Intracellular Ca<sup>2+</sup> was increased after the treatment with Fr.3.</p><fig id="pone-0094329-g010" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.g010</object-id><label>Figure 10</label><caption><title>Cytosolic Ca<sup>2+</sup> concentration in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> cells treated with Fractionation three.</title><p>Analysis of Ca<sup>2+</sup> concentration in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> cells by flow cytometry (upper panel) and fluorescence microscopy (lower panel, 10×). MIC, Minimum inhibitory concentration.</p></caption><graphic xlink:href="pone.0094329.g010"></graphic></fig></sec><sec id="s2c7"><title>Inhibition of cell respiration by Fr.3</title><p>As shown in <xref ref-type="fig" rid="pone-0094329-g011">Figure 11A</xref>, the dissolved oxygen of the control group significantly decreased within the initial 8 h. When the control bacteria entered into stationary phase, the dissolved oxygen decreased more slowly. The dissolved oxygen increased again after the control bacteria entered into the decline phase. However, at a lower concentration of Fr.3 (1/2MIC and MIC), the curve of dissolved oxygen changed gradually. When Fr.3 was 4MIC, there was almost no change in dissolved oxygen over 24 h.</p><fig id="pone-0094329-g011" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.g011</object-id><label>Figure 11</label><caption><title>Effect of Fractionation three on the cellular respiration of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>.</title><p>Determination of dissolved oxygen (A). Determination of inhibition rate and overlay rate (B). Effect of Fractionation three on hexokinase (HK), pyruvate kinase (PK), lactate dehydrogenase (LDH), malate dehydrogenase (MDH), succinate dehydrogenase (SDH) and total ATPase (T–ATPase) activities (C). Proposed mechanism of the inhibitory effect of Fractionation three on respiration (D). Cells without Fractionation three treatment were used as the control. Different letters indicated a significant difference (<italic>P</italic><0.05; ANOVA and Duncan’s multiple range test). Bars represent the mean ± standard deviation. Each experiment was replicated three times. EMP, glycolytic pathway; TCA, tricarboxylic acid cycle; HMP, pentose phosphate pathway; HK, hexokinase; PK, pyruvate kinase; LDH, lactate dehydrogenase; MDH, malate dehydrogenase; SDH, succinate dehydrogenase; G-6-P, glucose-6-phosphate; MIC, Minimum inhibitory concentration; Fr.3, Fractionation three.</p></caption><graphic xlink:href="pone.0094329.g011"></graphic></fig><p>The extent of inhibition of respiration provided by Fr.3 was compared with that from 3 typical inhibitors. The inhibition rates were ranked as follows: sodium phosphate > iodoacetic acid > Fr.3 > propanedioic acid. The overlay rates of the standard inhibitors and Fr.3 were ranked as follows: overlay rate of Fr.3 and sodium phosphate > overlay rate of Fr.3 and iodoacetic acid > overlay rate of Fr.3 and propanedioic acid (<xref ref-type="fig" rid="pone-0094329-g011">Figure 11B</xref>).</p><p>The effect of Fr.3 on hexokinase (HK), pyruvate kinase (PK), lactate dehydrogenase (LDH), malate dehydrogenase (MDH), succinate dehydrogenase (SDH) and total ATPase (T–ATPase) activities in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> are presented in <xref ref-type="fig" rid="pone-0094329-g011">Figure 11C</xref>. HK and PK activities showed no significant differences between the control and the 1/5MIC, 1/2MIC, MIC and 2MIC groups. Activities of LDH and ATP decreased sharply (<italic>P</italic><0.05) compared with the control. The MDH activity in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> significantly (<italic>P</italic><0.05) decreased, when the concentration of Fr.3 increased to 1/2MIC, MIC and 2MIC. When Fr.3 was treated at MIC and 2MIC, the SDH activity was significantly (<italic>P</italic><0.05) decreased in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>.</p></sec><sec id="s2c8"><title>Bacterial proteins</title><p>Protein electrophoresis bands from normal <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> cells were easily visualized. After treatment with Fr.3 (1/2MIC, MIC and 2MIC), the protein bands appeared shallow or even disappeared (14.4–35 kDa). As the concentration of Fr.3 increased to 4MIC, the disappearance of the protein bands became more distinct (<xref ref-type="fig" rid="pone-0094329-g012">Figure 12</xref>). Therefore, the inhibitory action of Fr.3 was dose–dependent.</p><fig id="pone-0094329-g012" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.g012</object-id><label>Figure 12</label><caption><title>Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS–PAGE) analysis of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>.</title><p>Lane 1, untreated <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>. Lane 2, <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> cells treated with Fractionation three at 1/2MIC concentration for 8 h. Lane 3, <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> cells treated with Fractionation three at the MIC concentration for 8 h. Lane 4, <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> cells treated with Fractionation three at 2MIC concentration for 8 h. Lane 5, <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> cells treated with Fractionation three at 4MIC concentration for 8 h. Lane M, marker.</p></caption><graphic xlink:href="pone.0094329.g012"></graphic></fig></sec><sec id="s2c9"><title>Inhibition of nucleic acids</title><p>4,6–diamidino–2–phenylindole (DAPI) is a fluorescent dye that can penetrate the cell membrane and combine with DNA and RNA. The amount of nucleic acids in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> after treatment with DAPI is reflected by the fluorescence intensity. In <xref ref-type="fig" rid="pone-0094329-g013">Figure 13</xref> (A), a fluorescence micrograph of the control nucleic acids is strongly fluorescent. The fluorescence became weaker with treatment of Fr.3 at 1/5MIC, 1/2MIC, and the MIC. There was almost no fluorescence observed after treatment with 2MIC and 4MIC of Fr.3. The results presented in <xref ref-type="fig" rid="pone-0094329-g013">Figure 13</xref> (B) showed that the quantity of DNA and RNA were significantly (<italic>P</italic><0.05) reduced when the concentration ranged from 1/5MIC, 1/2MIC, MIC, to 2MIC.</p><fig id="pone-0094329-g013" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.g013</object-id><label>Figure 13</label><caption><title>Inhibition of <italic>C. michiganense</italic> subsp. <italic>Sepedonicum</italic> nucleic acid synthesis by treatment with Fractionation three.</title><p>Fluorescence micrographs of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> treated with Fractionation three at 1/5MIC, 1/2MIC, MIC, 2MIC, and 4MIC concentrations (A, 100×). Effect of Fractionation three on the synthesis of nucleic acid in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> (B). Gel retardation assays (C). UV–visible spectra of genomic DNA treated with increasing concentrations of Fractionation three (D; 1/5MIC; 1/2MIC, MIC, and 2MIC). Competitive binding of Fractionation three (1/2MIC, MIC, and 2MIC) and EB with <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> genomic DNA (E). Flow cytometric analysis of the cell cycle (F). Cells without Fractionation three treatment were used as the control. Different letters indicated a significant difference (<italic>P</italic><0.05; ANOVA and Duncan’s multiple range test). Bars represent the mean ± standard deviation. Each experiment was replicated three times. MIC, Minimum inhibitory concentration.</p></caption><graphic xlink:href="pone.0094329.g013"></graphic></fig><p>To determine the molecular mechanisms of action, the DNA–binding capability of Fr.3 was evaluated using an electrophoretic gel mobility shift assay (<xref ref-type="fig" rid="pone-0094329-g013">Figure 13C</xref>). Results showed the DNA band in the control group was easily visualized. After treatment with Fr.3 (1/5MIC, 1/2MIC and MIC), the DNA bands appeared shallow and in some cases, they disappeared (2MIC). These results indicated that Fr.3 could interact with <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> genomic DNA, and the inhibitory action was dose–dependent.</p><p>Ultraviolet (UV)–visible scans and competitive studies with ethidium bromide (EB) were conducted in order to determine the extent of DNA conformational changes upon binding Fr.3. The absorption spectra of DNA treated with Fr.3 was shown in <xref ref-type="fig" rid="pone-0094329-g013">Figure 13D</xref>. In the UV region, samples exhibited an intense absorption band between 220 nm and 380 nm that increased with increasing concentrations of Fr.3. Competitive binding studies were performed in the presence of EB in order to investigate the existence of a potential intercalation of the contents of Fr.3 to DNA. EB is one of the most sensitive fluorescent probes for DNA structure and binds to DNA via intercalation of its planar phenanthridinium ring between adjacent base pairs on the DNA double helix. Fluorescence emission is enhanced because of intercalation of EB to DNA <xref rid="pone.0094329-Lepecq1" ref-type="bibr">[23]</xref>. Fluorescence spectroscopic results are presented in <xref ref-type="fig" rid="pone-0094329-g013">Figure 13E</xref>. The fluorescence intensities of EB bound to DNA at 493 nm decreased with increases in the concentration of Fr.3.</p><p>Flow cytometry showed that the <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> cell cycle changed upon incubation with Fr.3. In the bacterial cell cycle, the I phase (DNA preparatory period) is the same as the G<sub>1</sub> phase in the eukaryotic cell cycle. The R phase (DNA copy period) is the same as the S phase in the eukaryotic cell cycle. There is no G<sub>2</sub> phase in the bacterial cell cycle <xref rid="pone.0094329-Geng1" ref-type="bibr">[24]</xref>. As shown in <xref ref-type="fig" rid="pone-0094329-g013">Figure 13F</xref>, the G<sub>2</sub> phase was zero. After treatment with Fr.3 at 1/5MIC for 8 h, the number of bacteria in the I phase decreased from 73.23% to 66.68% (red area in <xref ref-type="fig" rid="pone-0094329-g013">Figure 13F</xref>), while the number of cells in the R phase increased from 26.77% to 33.32% (line area in <xref ref-type="fig" rid="pone-0094329-g013">Figure 13F</xref>). When treated at 1/2MIC and the MIC, the number of bacteria in the I phase decreased to 65.39%, and 62.51% (red area in <xref ref-type="fig" rid="pone-0094329-g013">Figure 13F</xref>), while the number in the R phase increased to 34.61% and 37.49% (line area in <xref ref-type="fig" rid="pone-0094329-g013">Figure 13F</xref>).</p></sec></sec></sec><sec id="s3"><title>Discussion</title><p>In this study, <italic>L. japonica</italic> was shown to have antimicrobial activity against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>, the causal agent of bacterial ring rot of potato. Solvents are commonly used to extract antimicrobial substances from plants. In this study, we used ethanol because the ethanol extracts had the highest (<italic>P</italic><0.05) antimicrobial activity against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>. The three factors that affected the antimicrobial substance extraction were extraction temperature (A), extraction time (B), and solid to liquid ratio (C) <xref rid="pone.0094329-Xiong1" ref-type="bibr">[25]</xref>. The effect of temperature on antimicrobial activity was studied by varying the temperature from 40 to 98°C. The data (<xref ref-type="fig" rid="pone-0094329-g002">Figure 2A</xref>) indicated that increasing the temperature enhanced diffusivity and hence, the antimicrobial activity increased with increasing temperature <xref rid="pone.0094329-Liu1" ref-type="bibr">[26]</xref>. When the temperature was too high, ethanol volatilization was accelerated and the solid to liquid ratio was lowed, and thus the yield of antimicrobial activity was decreased. Extraction time is one of the most influential parameters in antimicrobial substance extraction. Shorter extraction times resulted in incomplete extraction while longer extraction times waste time and energy, and leads to the possibility that the antimicrobial components might decompose (<xref ref-type="fig" rid="pone-0094329-g002">Figure 2B</xref>) <xref rid="pone.0094329-Yang1" ref-type="bibr">[27]</xref>. Seven solid to liquid ratios were investigated (<xref ref-type="fig" rid="pone-0094329-g002">Figure 2C</xref>). Because of insufficient contact between the solvent and the antimicrobial substance, it was not possible to extract the maximal amount of antimicrobial substances when the solid to liquid ratio was too low. When the solid to liquid ratio was too high, the time to concentrate would be long and the antimicrobial components might decompose <xref rid="pone.0094329-BernardoGil1" ref-type="bibr">[28]</xref>. An orthogonal array provides the shortest possible matrix of combinations in which all the parameters are varied to simultaneously consider their direct effect as well as their interactions. It can effectively screen out key variables by several representative experiments <xref rid="pone.0094329-Sun1" ref-type="bibr">[29]</xref>–<xref rid="pone.0094329-Dez1" ref-type="bibr">[33]</xref>. The results (<xref ref-type="table" rid="pone-0094329-t002">Table 2</xref>, <xref ref-type="table" rid="pone-0094329-t003">Table 3</xref>) revealed that factor A, and the interaction A×B had a significant (<italic>P</italic><0.05) effect on the antimicrobial activity of <italic>L. japonica</italic>. The optimum extraction conditions for <italic>L. japonica</italic> were defined as below: temperature 80°C, extraction time 12 h, and a solid to liquid ratio of 1∶25.</p><p>Active compound isolation and analysis are two important steps in plant extraction. Solvent partition, TLC and column chromatography are methods used to identify inhibitory compounds. All nineteen fractionations had antimicrobial activities against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>. Fr.3 had the highest (<italic>P</italic><0.05) inhibitory activity, and sub–fractionations obtained from Fr.3 did not have inhibitory activities higher than Fr.3. It can be concluded that the antimicrobial activity of Fr.3 against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> should be the result of synergy between a mixture of compounds, rather than a single compound. The components in Fr.3 might be linked together with chemical bonds. As the extract became more pure, the chemical bonds between the molecules were destroyed and the inhibitory activity decreased. GC-MS analysis revealed an abundance of alkanes, esters, acids and alcohols in Fr.3. According to the reports, we know that some algae have antimicrobial activities, and the main antimicrobial components in algae are alkanes. Zhen <xref rid="pone.0094329-Zhen1" ref-type="bibr">[34]</xref> indicated that the petroleum ether fraction of <italic>Pachydictyon coriaceum</italic> extracts had antimicrobial activity against <italic>Rhizopus chinensi</italic>, <italic>Penicillium chrysogenum</italic> and <italic>Pyricularia oryzae</italic>. Chemical analysis by GC-MS indicated that alkanes of n-C<sub>15</sub>∼n-C<sub>29</sub> could be found in the petroleum ether fraction. Karabay-Yavasoglu <xref rid="pone.0094329-KarabayYavasoglu1" ref-type="bibr">[35]</xref> indicated that volatile oil of <italic>Jania rubens</italic> (red alga) showed antimicrobial activity against five gram-positive and four gram-negative bacteria. GC-MS analysis identified 40 compounds, and docosane and tetratriacontane were the major components. It is evident from these data reported here that antimicrobial activity in algae is closely related with alkanes. Fr.3 contained high amounts of alkanes (80.97%), which might induce antimicrobial activity. In addition, Fr.3 exhibited inhibitory activities which might be attributed to the presence of abietic acid, linoleic acid ethyl ester, hexatriacontane, tetratetracontane, tetratriacontane, nonacosane, pentacosane, docosane, octacosane, hentriacontane and heptacosane. These compounds are known in plant extracts which have inhibitory activities <xref rid="pone.0094329-Lupea1" ref-type="bibr">[36]</xref>–<xref rid="pone.0094329-Wang1" ref-type="bibr">[52]</xref>.</p><p>In the present study, Fr.3 showed antimicrobial activity against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> even at lower concentration (0.04 mg/mL). As shown in <xref ref-type="fig" rid="pone-0094329-g005">Figure 5</xref>, the inhibitory effect of Fr.3 mainly occurred during the logarithmic phase indicating that Fr.3 inhibited the cell division of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>. After a 2 h exposure, the number of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> decreased significantly.</p><p>SEM and TEM were used to investigate possible changes in cell morphology. After treatment with Fr.3, <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> underwent cell wall disintegration, cell membrane disruption, cell swelling, fragmentation, clumping, bleb formation, separation between the cell wall and cell membrane, formation of vacuoles, decrease in cytoplasmic materials, and cell lysis (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6</xref> and <xref ref-type="fig" rid="pone-0094329-g007">Figure 7</xref>). The ultrastructural analysis highlighted the multiple sites of action of Fr.3 in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>. It is believed that the active components in Fr.3 disrupted the cell wall and cell membrane of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6:</xref> 5, 7, 8, 10, 11, 12; <xref ref-type="fig" rid="pone-0094329-g007">Figure 7:</xref> 1, 3), thereby causing leakage of the bacterial cell content (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6:</xref> 1, 6, 12, 13) resulting in the appearance of vacuoles (<xref ref-type="fig" rid="pone-0094329-g007">Figure 7:</xref> 2, 6, 7). Finally these changes resulted in fragmentation, misshapen cells, cell lysis and cell death (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6:</xref> 3, 9, 10, 11). The distortion of the cell physical structure caused expansion (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6:</xref> 7, 8, 10, 12) and destabilization of the membrane and would increase membrane fluidity, which in turn would increase passive permeability <xref rid="pone.0094329-Ultee1" ref-type="bibr">[53]</xref>. Polysaccharides that leak out of the cell would generate cell adhesions producing a ‘clump’ like shape (<xref ref-type="fig" rid="pone-0094329-g006">Figure 6:</xref> 2, 7, 8, 11, 12). Separation between the cell wall and cell membrane (<xref ref-type="fig" rid="pone-0094329-g007">Figure 7:</xref> 4, 5) was found in some damaged cells. This phenomenon might be caused by osmotic pressure changes induced by the active components in Fr.3. Thus, the use of SEM and TEM provided evidence of the antimicrobial activity of the components of Fr.3.</p><p>The cell membrane permeability analysis (<xref ref-type="fig" rid="pone-0094329-g008">Figure 8B</xref>) suggested that the action of Fr.3 (MIC and 2MIC) on the cell membrane lead to cell damage and content leakage from 2 h to 10 h after treatment. As shown in <xref ref-type="fig" rid="pone-0094329-g008">Figure 8C</xref>, the fluorescence decreased from 361.51 (control) to 133.69 (2MIC treatment). This suggested that Fr.3 caused disruption of the cell membrane by inducing depolarization. GC–MS analysis revealed that Fr.3 contained abundant lipophilic compounds (alkanes and esters). Lipophilic compounds have the ability to interact with hydrophobic structures like bacterial membranes <xref rid="pone.0094329-Sikkema1" ref-type="bibr">[54]</xref>. We speculated that the active compounds of Fr.3 disrupted the cytoplasmic membrane of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>, thereby causing leakage of the bacterial cell content. The dysfunction and disruption of the membrane, interference with the energy generation system in the cell, and enzyme inhibition preventing substrate utilization for energy production may also lead to the death of bacterial cells <xref rid="pone.0094329-Ibrahim1" ref-type="bibr">[55]</xref>–<xref rid="pone.0094329-Hara1" ref-type="bibr">[58]</xref>. AKP is an enzyme located between the cell membrane and cell wall <xref rid="pone.0094329-Hara1" ref-type="bibr">[58]</xref>. It functions to effectively maintain the cellular osmotic pressure and cell shape. When the cell wall is intact, AKP cannot pass through the cell walls, and it is not detected in the periplasmic space. However, damage to the external cell wall layers can cause the release of AKP from the cell <xref rid="pone.0094329-Cheng1" ref-type="bibr">[59]</xref>. In the present study, significantly (<italic>P</italic><0.05) higher AKP activity was only observed when concentration of Fr.3 was 2MIC and the treatment time was 6 h, 8 h and 10 h (<xref ref-type="fig" rid="pone-0094329-g008">Figure 8A</xref>). This result indicated that the cell wall of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> was destroyed only when the concentration was higher (2MIC) and the treatment time was longer (6 h). After a comprehensive consideration of all the results (<xref ref-type="fig" rid="pone-0094329-g008">Figure 8A, B, and C</xref>), we developed a potential mechanism to account for the antimicrobial activity of Fr.3 (<xref ref-type="fig" rid="pone-0094329-g008">Figure 8D</xref>). We speculated that the active compounds in Fr. 3 penetrated the cell walls and disrupted the cell membrane structures firstly. The cell wall was not destroyed when the concentration was lower and the treatment time was shorter. However, when the treatment time and concentration reached a certain level (2MIC and 6 h), the cell wall was then damaged.</p><p>Treatment of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> with Fr.3 might enhance production of reactive oxygen species (ROS; <xref ref-type="fig" rid="pone-0094329-g009">Figure 9A</xref>). Recently Kohanski et al. <xref rid="pone.0094329-Kohanski1" ref-type="bibr">[60]</xref> demonstrated that the production of ROS contributes to the antimicrobial activity of bactericidal antibiotics. An earlier report suggested that the excessive accumulation of ROS within the cells can cause damage to DNA, proteins and lipids which leads to disorganization, dysfunction and damage of membranes and proteins. Thus, the ROS production by Fr.3 might trigger a cascade of events like protein carbonylation, lipid peroxidation, mitochondrial membrane depolarization and DNA fragmentation in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic><xref rid="pone.0094329-Yang2" ref-type="bibr">[61]</xref>, <xref rid="pone.0094329-Anastasiou1" ref-type="bibr">[62]</xref>. SOD and CAT play central roles in the enzymatic defense system against oxidative exposure to eliminate ROS and to reduce damaging effects <xref rid="pone.0094329-Bowler1" ref-type="bibr">[63]</xref>–<xref rid="pone.0094329-Li2" ref-type="bibr">[66]</xref>. The changes of SOD activity (<xref ref-type="fig" rid="pone-0094329-g009">Figure 9B</xref>) indicated that Fr.3 caused SOD to increase at lower concentrations. As the concentration of Fr.3 increased to its MIC, the ROS exceeded the ability of SOD to eliminate them, and the SOD activity was decreased. The decrease in CAT activity (<xref ref-type="fig" rid="pone-0094329-g009">Figure 9C</xref>) indicated Fr.3 might directly inhibit CAT indicating that CAT was not able to eliminate the ROS. These findings suggested that the inhibitory effect of Fr.3 was associated with oxidative damage.</p><p>Ca<sup>2+</sup> plays an import role in the cell. Ca<sup>2+</sup> movement is strictly regulated in healthy cells. In general, the concentration of intracellular Ca<sup>2+</sup> is significantly lower than the extracellular concentration. However, when the cell membrane is seriously damaged, the inflow of extracellular Ca<sup>2+</sup> can initiate an increase in intracellular Ca<sup>2+</sup> concentration. The Ca<sup>2+</sup> in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> was increased when the samples were treated with different concentrations of Fr.3 (<xref ref-type="fig" rid="pone-0094329-g010">Figure 10</xref>). This result indicated that the damaged membrane of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> caused the inflow of Ca<sup>2+</sup>. In addition, ROS induced by Fr.3 might act as second messengers to activate Ca<sup>2+</sup> channels, further contributing to increases in Ca<sup>2+</sup> concentration <xref rid="pone.0094329-Foreman1" ref-type="bibr">[67]</xref>, <xref rid="pone.0094329-Mori1" ref-type="bibr">[68]</xref>. On the other hand, active Ca<sup>2+</sup> channels would further increase the permeability of the cell membrane.</p><p>In <xref ref-type="fig" rid="pone-0094329-g011">Figure 11A</xref>, the control cells showed a typical respiration curve. However, at lower Fr.3 concentrations, the curve of dissolved oxygen changed more gradually. When the concentration of Fr.3 was 4MIC, there was almost no change in dissolved oxygen. The result indicated that the respiration of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> was inhibited by Fr.3, and the effect was dose dependent. Iodoacetic acid, propanedioic acid, and sodium phosphate are three inhibitors known to inhibit the glycolytic pathway (EMP), tricarboxylic acid cycle (TCA) and pentose phosphate pathway (HMP), respectively. Calculation of the overlay rate of the known inhibitor and Fr.3 could determine which pathway was inhibited by Fr.3. When Fr.3 and the known inhibitor inhibited different respiration pathways, there should be synergy between Fr.3 and the known inhibitor, resulting in a higher overlay rate. When Fr.3 and the known inhibitor inhibited the same respiration pathway, the overlay rate of Fr.3 and the known inhibitor should be lower <xref rid="pone.0094329-Chen3" ref-type="bibr">[69]</xref>, <xref rid="pone.0094329-Yun1" ref-type="bibr">[70]</xref>. As shown in <xref ref-type="fig" rid="pone-0094329-g011">Figure 11B</xref>, the overlay rates of the known inhibitors and Fr.3 were ranked as: overlay rate of Fr.3 and sodium phosphate > overlay rate of Fr.3 and iodoacetic acid > overlay rate of Fr.3 and propanedioic acid. This result revealed that the EMP, TCA and HMP in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> were all inhibited by Fr.3, and that the inhibition effect of Fr.3 on TCA was the most significant. The EMP and TCA cycle oxidize hexose to ATP and NADH, the major energy currencies of the cell <xref rid="pone.0094329-Munger1" ref-type="bibr">[71]</xref>. Analysis of the enzyme activities of HK, PK, and LDH indicated that the EMP in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> was inhibited by Fr.3 (<xref ref-type="fig" rid="pone-0094329-g011">Figure 11C</xref>). HK in cells plays a key role in regulating EMP and catalyzes glucose to glucose 6–phosphate. PK, a final–stage enzyme in EMP, catalyzes the transfer of a phosphoryl group from phosphoenolpyruvate (PEP) to adenosine diphosphate (ADP), generating the substrates ATP and pyruvate for anaerobic and aerobic metabolism <xref rid="pone.0094329-Mattevi1" ref-type="bibr">[72]</xref>, <xref rid="pone.0094329-Rigden1" ref-type="bibr">[73]</xref>. However, even at high concentrations, Fr.3 did not change the HK and PK activities in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>. LDH is a key enzyme that catalyzes the conversion of pyruvic acid to lactic acid, and enables the EMP to produce enough ATP. As shown in <xref ref-type="fig" rid="pone-0094329-g011">Figure 11C</xref>, the activity of LDH decreased significantly (<italic>P</italic><0.05), when the concentrations of Fr.3 were 1/5MIC, 1/2MIC, MIC and 2MIC. This result indicated that Fr.3 inhibited LDH resulting in impairment of the EMP. We analyzed the activities of MDH and SDH, two enzymes involved in the TCA cycle. MDH, a coenzyme of NADP<sup>+</sup>, forms NADPH by accepting hydrogen from metabolites during biosynthesis. SDH plays an important role in the cellular energy metabolism of microbes, and its activity reflects the energy metabolic status of the bacterial cell. However the SDH and MDH activities in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> were all inhibited by Fr.3 at higher concentrations (<xref ref-type="fig" rid="pone-0094329-g011">Figure 11C</xref>). Thus, the production of essential amino acids in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> were decreased because the TCA cycle which is necessary to provide amino acids as carbon sources, was inhibited by Fr.3 <xref rid="pone.0094329-Alteri1" ref-type="bibr">[74]</xref>. After treatment with Fr.3, ATP was also decreased. One reason may be that the NADH associated with the TCA cycle was reduced or that the ATPase activity was inhibited by Fr.3 because of the increased permeability of the cytoplasmic membrane (<xref ref-type="fig" rid="pone-0094329-g011">Figure 11C</xref>). Since the respiratory chain of bacteria is located in the cell membrane, contact with the antibacterial agent destroyed the membrane structure and disrupted the function of the enzyme system in the respiratory chain <xref rid="pone.0094329-Yao1" ref-type="bibr">[75]</xref>. Taken together, we present a theory that explains the inhibitory effect of Fr.3 on respiration in <xref ref-type="fig" rid="pone-0094329-g011">Figure 11D</xref>.</p><p>The result of the sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS–PAGE) assay showed that the total proteins in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> decreased following treatment with Fr.3. In addition, some protein bands even disappeared (<xref ref-type="fig" rid="pone-0094329-g012">Figure 12</xref>). We speculated that Fr.3 could inhibit protein synthesis or control gene expression or that a substantial amount of protein leaked out of the bacteria following membrane disruption. The mechanism of protein breakdown remains unclear and is a topic for future study.</p><p><xref ref-type="fig" rid="pone-0094329-g013">Figure 13</xref> showed that Fr.3 effectively inhibited the synthesis of nucleic acid in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>, resulting in a decrease in DNA and RNA (<xref ref-type="fig" rid="pone-0094329-g013">Figure 13A, B</xref>). Gel retardation analysis (<xref ref-type="fig" rid="pone-0094329-g013">Figure 13C</xref>) showed that Fr.3 could bind to DNA. This result suggested that Fr.3 could directly interact with <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> genomic DNA. One possible mechanism of antimicrobial action of Fr.3 was related to its inhibition of metabolic pathways by blocking or reducing DNA replication and/or transcription through binding DNA <xref rid="pone.0094329-Lu1" ref-type="bibr">[76]</xref>. In order to clarify the molecular mechanism of the DNA damage and the intracellular target of Fr.3, UV–visible absorption changes and a competitive assay employing EB were examined. The changes observed in the UV spectra may give evidence of the existing interaction mode. Generally, hyperchromism indicates that the complex binds to the negatively charged phosphate backbone at the periphery of the DNA, causing damage to the DNA double helix <xref rid="pone.0094329-Han1" ref-type="bibr">[77]</xref>, <xref rid="pone.0094329-Tarushi1" ref-type="bibr">[78]</xref>. On the other hand, hypochromism and red shift indicate a conformational change of the DNA double helix. The changes observed in the UV spectra of the DNA after mixing it with Fr.3 (increase of absorption) indicated that Fr.3 might interact with DNA by the direct formation of a new complex with double helical DNA, causing double helix structural damage. The DNA double helix possesses many hydrogen bonding sites which are accessible both in the minor and major grooves, and it is possible that the components of Fr.3 might bond with DNA through hydrogen bonds, which in turn, may contribute to the hyperchromism observed in the absorption spectra <xref rid="pone.0094329-SenthilKumar1" ref-type="bibr">[79]</xref>. Competitive binding study with EB has been employed to study the interactions involved in DNA complex formation in order to investigate a potential intercalative binding mode. EB does not show any appreciable emission in buffer solution due to fluorescence quenching of the free EB by the solvent molecules <xref rid="pone.0094329-Efthimiadou1" ref-type="bibr">[80]</xref>. On addition of DNA, its fluorescence intensity is highly enhanced because of its strong intercalation between the adjacent DNA base pairs <xref rid="pone.0094329-Efthimiadou2" ref-type="bibr">[81]</xref>. Addition of a second molecule, which binds to DNA more strongly than EB, can decrease the DNA–induced EB emission <xref rid="pone.0094329-Efthimiadou1" ref-type="bibr">[80]</xref>. The intensity of the emission band at 493 nm of the DNA–EB system significantly decreased (<xref ref-type="fig" rid="pone-0094329-g013">Figure 13E</xref>) in <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> genomic DNA, which indicated the competition of Fr.3 components with EB in binding to DNA. The quenching of DNA–EB fluorescence suggested that Fr.3 components prevented EB from inserting into the DNA and Fr.3 could interact with DNA by intercalation <xref rid="pone.0094329-Efthimiadou2" ref-type="bibr">[81]</xref>. The cell cycle can be thought of as a circuit of regulatory components which, by enabling an efficient flow of information, triggers events critical for cellular reproduction <xref rid="pone.0094329-Chen4" ref-type="bibr">[82]</xref>. The results (<xref ref-type="fig" rid="pone-0094329-g013">Figure 13F</xref>) indicated that the population of the treated cells at the I phase dropped to 66.68% (1/5MIC), 65.39% (1/2MIC) and 62.51% (MIC) respectively, compared with the control (73.23%). We speculated that the components of Fr.3 inhibited RNA or protein which is related to cell division during the I phase. From <xref ref-type="fig" rid="pone-0094329-g013">Figure 13F</xref>, we know that the cell population at R phase increased to 33.32% (1/5MIC), 35.64% (1/2MIC) and 37.49% (MIC), respectively, compared with the control (26.77%). This indicated that Fr.3 disrupted R phase rather than I phase, causing most cells to remain in R phase. However, the results of the bactericidal kinetic assay revealed that inhibitory effect of Fr.3 occurred mainly during the logarithmic phase where the number of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> decreased significantly. These results indicated that Fr.3 led the cell population to arrest at R phase, with few cells passing through R phase into the cell division phase, finally resulting in a decrease in the number of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>. According to these results, we speculated that Fr.3 components disrupted the normal cell cycle of the bacteria, sequentially inhibiting the growth of the bacteria, and leading to cell lysis.</p><p>Based on the present research, a schematic model of the proposed mechanism of Fr.3 is described in <xref ref-type="fig" rid="pone-0094329-g014">Figure 14</xref>. The active substances in Fr.3 resulted in loss of outer membrane integrity, causing outer membrane damage. The disruption of the cell membrane caused the leakage of cellular content, inhibition of the proton pump, respiratory chain, electron transfer and oxidative phosphorylation. A massive loss of intracellular ATP might induce a series of structural, biochemical, and functional alterations sufficient to trigger irreversible necrotic cellular pathways <xref rid="pone.0094329-Lieberthal1" ref-type="bibr">[83]</xref>. Secondly, Fr.3 treatment enhanced the production of ROS. The damaged cell membrane and ROS production increased Ca<sup>2+</sup> in <italic>C. michiganense</italic> subsp. <italic>Sepedonicum</italic>. The activated Ca<sup>2+</sup> channels would further increase the permeability of the cell membrane. In addition, Fr.3 also inhibited the EMP pathway and TCA cycle and the respiration was also inhibited by Fr.3. Thirdly, active components inhibited protein and nucleic acid synthesis, disrupting the normal cycle of DNA replication. Fr.3 could directly bind with <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> genomic DNA, causing double helix structural damage. All these factors could result in cell decomposition and eventually death. These findings indicate that <italic>L. japonica</italic> extract has a significant potential for inhibiting <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>.</p><fig id="pone-0094329-g014" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.g014</object-id><label>Figure 14</label><caption><title>Proposed mechanism of antimicrobial activity of Fractionation three against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>.</title><p>Arrowheads represent activating events. LDH, lactate dehydrogenase; MDH, malate dehydrogenase; SDH, succinate dehydrogenase; EMP, glycolytic pathway; TCA, tricarboxylic acid cycle; ROS, reactive oxygen species; Fr.3, Fractionation three.</p></caption><graphic xlink:href="pone.0094329.g014"></graphic></fig></sec><sec sec-type="materials|methods" id="s4"><title>Materials and Methods</title><sec id="s4a"><title>Plant material and pathogen</title><p><italic>Clavibater michiganense</italic> subsp. <italic>sepedonicum</italic> (Spieckermann & Kotthoff) Davis et al. (ATCC 33113) was provided by the Chinese Academy of Agricultural Science. <italic>Laminaria japonica</italic> was purchased from a local market.</p></sec><sec id="s4b"><title>Optimization of production of antimicrobial substances</title><sec id="s4b1"><title>Solvent selection</title><p><italic>L. japonica</italic> was washed with distilled water <xref rid="pone.0094329-AbdelMonaim1" ref-type="bibr">[84]</xref>. The dried samples were finely ground and pulverized using a blender <xref rid="pone.0094329-Choi1" ref-type="bibr">[85]</xref>. The powdered <italic>L. japonica</italic> (10 g of each) was extracted with 100 mL of methanol, ethanol, acetone, chloroform, ethyl acetate, butanol, benzene or petroleum ether for 8 h at their corresponding solvent boiling temperatures. After filtration, the organic solvent was evaporated under reduced pressure and temperature by a vacuum rotary evaporator. Then, each sample was individually dissolved in DMSO to give a final concentration of 1 mg/mL. The extracts were evaluated for their antimicrobial activities as described below.</p><p>Antimicrobial activity was determined by an agar diffusion method (ADM) based on radial diffusion <xref rid="pone.0094329-Michielin1" ref-type="bibr">[86]</xref>. Suspensions of the microorganism (10<sup>8</sup> cfu/mL) were used for the studies. The medium contained 1 L distilled water, 20 g agar, 10 g peptone, 5 g beef extract, and 5 g sodium chloride. The agar surface was perforated with holes (10 mm in diameter), and a 200 μL volume of sample was pipetted into each hole. The DMSO was used as the control since it does not inhibit microorganism growth <xref rid="pone.0094329-SmniaJr1" ref-type="bibr">[87]</xref>. After the diffusion of the solution in each hole, the plates were inverted and incubated at 28°C for 24 h. Then, the antimicrobial activity of the inhibition zone (mm) was recorded. Each treatment was replicated four times.</p></sec><sec id="s4b2"><title>Effects of extraction temperature, extraction time and solid to liquid ratio on antimicrobial substance production</title><p>Three important factors were considered when evaluating the antimicrobial activity of <italic>L. japonica</italic> against <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic>: extraction temperature (°C), extraction time (h) and solid to liquid ratio (g: mL). Each factor was divided into seven levels, and for each experiment, a total of 10 g of <italic>L. japonica</italic> sample was added to the corresponding volume of ethanol and extracted as described in <xref ref-type="table" rid="pone-0094329-t005">Table 5</xref>. Four replicates were used for each extraction. Then, the antimicrobial activity was analyzed by ADM. Each treatment was replicated ten times. From the results of the antimicrobial activity, three reasonable levels of each factor were chosen for orthogonal experimental design.</p><table-wrap id="pone-0094329-t005" orientation="portrait" position="float"><object-id pub-id-type="doi">10.1371/journal.pone.0094329.t005</object-id><label>Table 5</label><caption><title>Factors and levels of orthogonal experiment.</title></caption><alternatives><graphic id="pone-0094329-t005-5" xlink:href="pone.0094329.t005"></graphic><table frame="hsides" rules="groups"><colgroup span="1"><col align="left" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col><col align="center" span="1"></col></colgroup><thead><tr><td align="left" rowspan="1" colspan="1">Factors</td><td align="left" rowspan="1" colspan="1">Conditions</td><td colspan="7" align="left" rowspan="1">Levels</td></tr><tr><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1">1</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">3</td><td align="left" rowspan="1" colspan="1">4</td><td align="left" rowspan="1" colspan="1">5</td><td align="left" rowspan="1" colspan="1">6</td><td align="left" rowspan="1" colspan="1">7</td></tr></thead><tbody><tr><td align="left" rowspan="1" colspan="1">Temperature (°C)</td><td align="left" rowspan="1" colspan="1">Extraction time 8 h</td><td align="left" rowspan="1" colspan="1">40</td><td align="left" rowspan="1" colspan="1">50</td><td align="left" rowspan="1" colspan="1">60</td><td align="left" rowspan="1" colspan="1">70</td><td align="left" rowspan="1" colspan="1">80</td><td align="left" rowspan="1" colspan="1">90</td><td align="left" rowspan="1" colspan="1">98</td></tr><tr><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1">Solid to liquid ratio 1:15</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td></tr><tr><td align="left" rowspan="1" colspan="1">Extraction time (h)</td><td align="left" rowspan="1" colspan="1">Temperature 80°C</td><td align="left" rowspan="1" colspan="1">2</td><td align="left" rowspan="1" colspan="1">4</td><td align="left" rowspan="1" colspan="1">6</td><td align="left" rowspan="1" colspan="1">8</td><td align="left" rowspan="1" colspan="1">10</td><td align="left" rowspan="1" colspan="1">12</td><td align="left" rowspan="1" colspan="1">14</td></tr><tr><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1">Solid to liquid ratio 1:15</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td></tr><tr><td align="left" rowspan="1" colspan="1">Solid to liquid ratio (g: mL)</td><td align="left" rowspan="1" colspan="1">Extraction time 8 h</td><td align="left" rowspan="1" colspan="1">1:10</td><td align="left" rowspan="1" colspan="1">1:15</td><td align="left" rowspan="1" colspan="1">1:20</td><td align="left" rowspan="1" colspan="1">1:25</td><td align="left" rowspan="1" colspan="1">1:30</td><td align="left" rowspan="1" colspan="1">1:35</td><td align="left" rowspan="1" colspan="1">1:40</td></tr><tr><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1">Temperature 80°C</td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td><td align="left" rowspan="1" colspan="1"></td></tr></tbody></table></alternatives></table-wrap></sec><sec id="s4b3"><title>Orthogonal experimental design</title><p>Based on the results of the extraction temperature, extraction time and solid to liquid ratio, three controlling factors at three levels, denoted 1, 2, and 3, were selected to investigate the optimal extraction conditions (<xref ref-type="table" rid="pone-0094329-t001">Table 1</xref>). The impact of three factors was studied using L<sub>27</sub>(3<sup>13</sup>) orthogonal design, with consideration of the interactions between the factors <xref rid="pone.0094329-Jia1" ref-type="bibr">[88]</xref>, <xref rid="pone.0094329-Zhou1" ref-type="bibr">[89]</xref>. Twenty–seven experiments were performed. The complete design matrix of 27 experiments and the obtained results are shown in <xref ref-type="table" rid="pone-0094329-t002">Table 2</xref>. For each experiment, a total of 10 g of <italic>L. japonica</italic> sample was added to the corresponding volume of ethanol and extracted as described in <xref ref-type="table" rid="pone-0094329-t002">Table 2</xref>. Then, the antimicrobial activity of extracts from each sample was analyzed by ADM. Each treatment was replicated twelve times. ANOVA was performed to analyze the obtained data by using the SPSS software package (version 17.0).</p></sec></sec><sec id="s4c"><title>Major antimicrobial compound analysis</title><sec id="s4c1"><title>Solvent partition of <italic>L. japonica</italic> alcoholic extracts</title><p>The <italic>L. japonica</italic> alcoholic extracts were evaporated to dryness and then sterile water was added. Then the sample was extracted using petroleum ether, chloroform, ethyl acetate, or <italic>n</italic>–butyl alcohol as the extraction solvent (1∶1, v/v). The process was repeated five times <xref rid="pone.0094329-Wang2" ref-type="bibr">[90]</xref>.</p></sec><sec id="s4c2"><title>Mobile phase selection</title><p>In order to select the mobile phase for silica gel column chromatography, TLC analysis was carried out. Petroleum ether partitions were spotted on TLC plates and were developed in the following solvent systems according to the solvent polarity (from low to high): benzene, chloroform/benzene (1∶1), chloroform, cyclohexane/ethyl acetate (8∶2), chloroform/acetone (95∶5), benzene/acetone (9∶1), benzene/ethyl acetate (8∶2), chloroform/diethyl ether (9∶1), petroleum ether/ethyl acetate (2∶1), benzene/diethyl ether (6∶4), chloroform/diethyl ether (8∶2), chloroform/methanol (99∶1), benzene/methanol (9∶1), chloroform/diethyl ether (6∶4), chloroform/methanol (95∶5), chloroform/acetone (7∶3), benzene/ethyl acetate (3∶7), ethyl acetate/methanol (99∶1), chloroform/methanol (9∶1) and methanol. The spots were visualized with iodine vapor. The solvent system that yielded the most spots was selected as the mobile phase for silica gel column chromatography.</p></sec><sec id="s4c3"><title>Isolation of active substances from the petroleum ether phase with the best antimicrobial activity</title><p>The petroleum ether phase was purified by silica gel column chromatography. To obtain gradient elution, the mobile phase (petroleum ether and ethyl acetate (100∶0, 100∶1, 100∶2, 100∶3, 100∶5, 100∶7, 100∶10, 100∶15, 100∶20, 100∶30, 100∶50, 100∶100, 0:100, v/v)) was added to the column at 3–4 drops/s. A total of 294 fractions (bottles) were collected, 15 mL per bottle. The constituents in each fraction were compared by TLC. According to the TLC assay, all the fractions were amalgamated into nineteen groups. The nineteen groups were then evaporated to dryness. The dried fractionations of the nineteen groups were dissolved in DMSO to give a final concentration of 1 mg/mL for the antimicrobial activity assay (ADM). Each treatment was replicated five times.</p></sec><sec id="s4c4"><title>Analysis of antimicrobial compounds using GC–MS</title><p>Based on the antimicrobial activity assay, the chemical constituents of the most efficacious group were determined using a GC–MS method <xref rid="pone.0094329-Muthukumar1" ref-type="bibr">[91]</xref>. One μL of diluted sample (1∶100 v/v, in acetone) was injected into the GC–MS (Thermo Trace 2000–Polaris Q, Thermo Finnigan Co., California, USA) operating in a splitless mode. The sample was separated on an Rtx–5MS column (length = 30 m, i.d. = 0.25 mm, thickness = 0.25 μm). The carrier gas was helium, and the flow rate was 1 mL/min. The column temperature was initially set at 80°C for 4 minutes, then gradually increased to 150°C at 15°C/min, and finally increased to 250°C at 10°C/min and held for 15 minutes. The MS total time was 30 minutes. The source and transfer line temperature were set at 250°C and 280°C, respectively. The mass spectrometer was operated in the 70 eV EI mode with scanning from 35 amu to 500 amu every 0.5 s. The major constituents were identified by the relative percent peak area of the TIC from the MS signal and identified by comparing their mass fragmentation pattern with those stored in the spectrometer database using NIST05.LIB (National Institute of Standards and Technology), and with data reported in the literature.</p></sec></sec><sec id="s4d"><title>Investigation of antimicrobial mechanism</title><sec id="s4d1"><title>Determination of MIC</title><p>The MIC of Fr.3 against <italic>C</italic>. <italic>michiganense</italic> subsp. <italic>sepedonicum</italic> was determined by the ADM method as described above. Fr.3 was first diluted to a concentration of 0.64 mg/mL, and then further diluted in DMSO to produce eight concentrations ranging from 0.64 mg/mL to 0.005 mg/mL. The MIC value was defined as the lowest concentration at which a visible inhibition zone around the hole was observed compared with the control (DMSO) <xref rid="pone.0094329-Barros1" ref-type="bibr">[92]</xref>, <xref rid="pone.0094329-Talibi1" ref-type="bibr">[93]</xref>. Each treatment was replicated four times.</p></sec><sec id="s4d2"><title>Bactericidal kinetic assay</title><p>The bactericidal kinetic assay was performed by using appropriate concentrations of Fr.3, including 1/2MIC, MIC and 2MIC. <italic>C</italic>. <italic>michiganense</italic> subsp. <italic>sepedonicum</italic> (logarithmic phase) was adjusted to 10<sup>6</sup> cfu/mL, and was then incubated with three concentrations of Fr.3 (1/2MIC, MIC and 2MIC). Samples for viable cell counting were taken every hour for 24 h. The solution without Fr.3 was used as a control <xref rid="pone.0094329-Talibi1" ref-type="bibr">[93]</xref>–<xref rid="pone.0094329-Avila1" ref-type="bibr">[96]</xref>.</p></sec><sec id="s4d3"><title>SEM</title><p>Logarithmic phase cells of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> were treated with Fr.3 at MIC and 2MIC for 8 h. After incubation, the sample was first fixed with 4% gluteraldehyde at 4°C overnight. A second fixation procedure in 4% osmium tetraoxide (OSO<sub>4</sub>) was then carried out at 4°C for 2 h. The fixed samples were rinsed with phosphate buffer (PBS) for 10–15 minutes, and then were submerged in gradually increased ethanol concentrations (30%, 50%, 70%, 80%, 90%) for 20 minutes each, and finally submerged in 100% ethanol three times at 20 minutes intervals to ensure full dehydration. The samples were critical–point dried with CO<sub>2</sub> in an HCP–2 critical-point dryer (Hitachi, Japan), and coated with IB–5 gold–palladium (Eiko, Japan). Samples were viewed at 25 kV accelerating voltage in a scanning electron microscope (JSM–35C, JEOL, Japan).</p></sec><sec id="s4d4"><title>TEM</title><p>Logarithmic phase cells of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> were treated with Fr.3 at the MIC for 8 h. The samples were fixed in 3% glutaraldehyde followed by 4% OSO<sub>4</sub>. Then, the samples were dehydrated in gradually increasing acetone solutions, and embedded in Epon812. Ultrathin sections were cut and stained with uranyl acetate and lead citrate. The samples were examined using a JEM–1011(JEOL, Japan) transmission electron microscope operated at 80 kV.</p></sec><sec id="s4d5"><title>Permeability of the cell wall and cell membrane</title><p>AKP was examined to determine the cell wall integrity of <italic>C</italic>. <italic>michiganense</italic> subsp. <italic>sepedonicum</italic>. Bacteria cells were incubated to logarithmic phase, and then mixed with different concentrations (1/5MIC, 1/2MIC, MIC and 2MIC) of Fr.3. The suspensions were incubated at 28°C for 2 h, 4 h, 6 h, 8 h and 10 h. Cells without Fr.3 were used as the control. At each time interval, the cells were centrifuged at 4000 rpm (1484×g) and the supernatant was examined using a kit purchased from Nanjing Jiancheng Bioengineering Institute (Nanjing, China). All the measurements were done in triplicate.</p><p>The cell membrane integrity of <italic>C</italic>. <italic>michiganense</italic> subsp. <italic>sepedonicum</italic> was examined by determination of the release of material by absorption at 260 nm <xref rid="pone.0094329-Chen5" ref-type="bibr">[97]</xref>–<xref rid="pone.0094329-Devi1" ref-type="bibr">[99]</xref>. Bacteria cells (logarithmic phase) were mixed with different concentrations (1/5MIC, 1/2MIC, MIC and 2MIC) of Fr.3. The suspensions were incubated at 28°C for 2 h, 4 h, 6 h, 8 h and 10 h. Cells without Fr.3 were used as the control. At each time interval, the cell was centrifuged at 4000 rpm (1484×g) and the absorbance of the obtained supernatant was measured at OD<sub>260nm</sub> using a UV/VIS spectrophotometer (752pc, Shanhai Guangpu Instrument Co., LTD, China). All the measurements were done in triplicate.</p><p>The membrane potential of <italic>C</italic>. <italic>michiganense</italic> subsp. <italic>sepedonicum</italic> treated with Fr.3 was analyzed by rhodamine 123 staining followed by flow cytometry analysis <xref rid="pone.0094329-Haines1" ref-type="bibr">[100]</xref>. Rhodamine 123 is a cell–permeable cationic fluorescent dye. <italic>C</italic>. <italic>michiganense</italic> subsp. <italic>sepedonicum</italic> (logarithmic phase) was mixed with different concentrations (1/5MIC, 1/2MIC, MIC and 2MIC) of Fr.3. The cells that were not treated with Fr.3 were used as the control. The suspensions were incubated at 28°C for 8 h. The cells were washed twice with PBS, and subsequently stained with 20 μM of rhodamine 123 in total darkness at room temperature for 30 minutes. The population of cells exhibiting green fluorescence was quantified using FACS Calibur flow cytometer (Becton Dickinson, United States), and the fluorescence micrographs were taken using a fluorescence microscope (Olympus microscope (BX51, Japan) digital microscope camera (DP72 Japan)) at an excitation wavelength of 507 nm and emission wavelength of 529 nm.</p></sec><sec id="s4d6"><title>Determination of ROS, SOD, and CAT activities</title><p>The intracellular ROS was determined using the 2,7–dichlorofluorescin diacetate (DCFH–DA) assay. <italic>C</italic>. <italic>michiganense</italic> subsp. <italic>sepedonicum</italic> (logarithmic phase) was mixed with different concentrations (1/5MIC, 1/2MIC, MIC and 2MIC) of Fr.3. The cells that were not treated with Fr.3 were used as the control. The suspensions were incubated at 28°C for 8 h. Subsequently, cells were collected by centrifugation, and then the pellet was resuspended in DCFH–DA solution (20 μmol/L) in total darkness at room temperature for 30 minutes. Then these samples were washed to remove the excess DCFH–DA and adjusted to OD<sub>630</sub> to 0.3 with PBS. The widths of both the excitation slit and the emission slit were set to 5 nm. Fluorescence intensity was measured at an excitation wavelength of 488 nm and an emission wavelength of 535 nm using a fluorescence spectrophotometer (F–280, Tianjin, Gangdong Sci & Tech Development Co., LTD, China) <xref rid="pone.0094329-Wang3" ref-type="bibr">[101]</xref>, <xref rid="pone.0094329-Cheng2" ref-type="bibr">[102]</xref>.</p><p><italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> was grown to logarithmic phase, and treated with Fr.3 at 1/5MIC, 1/2MIC, MIC, and 2MIC. Cells without Fr.3 treatment were used as the control. All samples were incubated at 28°C for 8 h. Then, 10 mL of each sample was centrifuged at 4000 rpm (1484×g) and was resuspended in 1 mL PBS. Each sample was sonicated using a probe sonicator at 200 W for 15minutes (working mode: 2 s pulse followed by a 4 s stop). The suspension was centrifuged at 12000 rpm (13363×g) for 15 minutes at 4°C, and then the SOD and CAT, in the supernatant were examined using a kit purchased from Nanjing Jiancheng Bioengineering Institute (Nanjing, China) <xref rid="pone.0094329-Shen1" ref-type="bibr">[103]</xref>.</p></sec><sec id="s4d7"><title>Cytosolic Ca<sup>2+</sup> concentration determination</title><p>To detect the cytosolic Ca<italic><sup>2+</sup></italic> levels, the Ca<italic><sup>2+</sup></italic> specific fluorescent dye, Fluo3–AM, was loaded into the cells, and the samples were analyzed by flow cytometry <xref rid="pone.0094329-Wang4" ref-type="bibr">[104]</xref>. <italic>C</italic>. <italic>michiganense</italic> subsp. <italic>sepedonicum</italic> (logarithmic phase) was mixed with different concentrations (1/5MIC, 1/2MIC, and MIC) of Fr.3. The cells without Fr.3 treatment were used as the control. The suspensions were incubated at 28°C for 8 h. The cells were washed twice with PBS, and subsequently stained with 4 μM of Fluo3–AM in total darkness at room temperature for 60minutes. The population of cells exhibiting green fluorescence was quantified using FACS Calibur flow cytometer (Becton Dickinson, USA), and the fluorescence micrographs were taken using an excitation wavelength of 490 nm and emission wavelength of 520 nm.</p></sec><sec id="s4d8"><title>Effect of Fr.3 on cellular respiration</title><p><italic>C</italic>. <italic>michiganense</italic> subsp. <italic>sepedonicum</italic> (logarithmic phase) was mixed with different concentrations (1/2MIC, MIC, and 4MIC) of Fr.3. The cells without Fr.3 treatment were used as the control. Samples for dissolved oxygen (mg/L) testing were taken every hour for a 24 h period. Each treatment was replicated three times.</p><p><italic>C</italic>. <italic>michiganense</italic> subsp. <italic>sepedonicum</italic> (logarithmic phase) was inoculated into liquid medium. The liquid medium was stirred for 5 minutes and then the initial dissolved oxygen (V<sub>0</sub>) was determined. The samples were mixed with propanedioic acid (1/5MIC), iodoacetic acid (1/5MIC), sodium phosphate (1/5MIC) or Fr.3 (1/5MIC) and the cells without any treatment were used as the control. After 8 h, the final dissolved oxygen of the treatment group (V<sub>1</sub><sup>'</sup>) and the control group (V<sub>0</sub><sup>'</sup>) were determined. The inhibition rate and overlay rate were evaluated as follows:<disp-formula id="pone.0094329.e001"><graphic xlink:href="pone.0094329.e001.jpg" position="anchor" orientation="portrait"></graphic></disp-formula></p><p>R<sub>0</sub> = The respiration rate of <italic>C</italic>. <italic>michiganense</italic> subsp. <italic>sepedonicum</italic> without treatment</p><p>R<sub>1</sub> = The respiration rate of <italic>C</italic>. <italic>michiganense</italic> subsp. <italic>sepedonicum</italic> induced by propanedioic acid (1/5MIC), iodoacetic acid (1/5MIC), sodium phosphate (1/5MIC) or Fr.3 (1/5MIC).<disp-formula id="pone.0094329.e002"><graphic xlink:href="pone.0094329.e002.jpg" position="anchor" orientation="portrait"></graphic></disp-formula></p><p>R<sub>1</sub> = The respiration rate of <italic>C</italic>. <italic>michiganense</italic> subsp. <italic>sepedonicum</italic> induced by Fr.3 (1/5MIC).</p><p>R<sub>1</sub><sup>'</sup> = The respiration rate of <italic>C</italic>. <italic>michiganense</italic> subsp. <italic>sepedonicum</italic> induced by the combined action of Fr.3 (1/5MIC) and propanedioic acid (1/5MIC), the combined action of Fr.3 (1/5MIC) and iodoacetic acid (1/5MIC), or the combined action of Fr.3 (1/5MIC) and sodium phosphate (1/5MIC) <xref rid="pone.0094329-Song1" ref-type="bibr">[105]</xref>.</p><p><italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> was grown to logarithmic phase, and treated with Fr.3 at 1/5MIC, 1/2MIC, MIC, and 2MIC. Cells without Fr.3 were used as the control. All samples were incubated at 28°C for 8 h. A total of 10 mL of each sample was centrifuged at 4000 rpm (1484×g) and was resuspended in 1 mL sodium chloride (0.8%). Then each sample was sonicated using a probe sonicator at 200 W for 15 minutes (working mode: pulse 2 s followed by 4 s stop). The suspension was centrifuged at 12000 rpm (13363×g) for 15 minutes at 4°C, and then HK, PK, LDH, MDH, SDH and total ATP ase (T–ATPase) activities in the supernatant were examined using a kit purchased from Nanjing Jiancheng Bioengineering Institute (Nanjing, China) <xref rid="pone.0094329-Bradford1" ref-type="bibr">[106]</xref>, <xref rid="pone.0094329-Wang5" ref-type="bibr">[107]</xref></p></sec><sec id="s4d9"><title>SDS–PAGE</title><p>Logarithmic phase cells of <italic>C. michiganense</italic> subsp. <italic>sepedonicum</italic> were treated with Fr.3 at 1/2MIC, MIC, 2MIC and 4MIC for 8 h. Cells were collected by centrifugation and mixed with SDS sample buffer, incubated at 100°C for 5 minutes, and loaded onto 15% SDS-PAGE gels. Then, the gels were stained with Coomassie blue R-250 for 30 minutes and washed in destainer for 2 h <xref rid="pone.0094329-Friedlander1" ref-type="bibr">[108]</xref>.</p></sec><sec id="s4d10"><title>Effect of Fr.3 on nucleic acids</title><p>The intracellular content of DNA and RNA were determined using DAPI staining assay. C. <italic>michiganense</italic> subsp. <italic>sepedonicum</italic> (logarithmic phase) was mixed with different concentrations (1/5MIC, 1/2MIC, MIC and 2MIC) of Fr.3. The cells without Fr.3 treatment was used as the control. The suspensions were incubated at 28°C for 8 h. Subsequently, the cells (2 mL) were incubated with 5 μL (0.1 mg/mL) DAPI in total darkness at room temperature for 30 minutes. Then these samples were washed to remove the excess DAPI and adjusted to an OD<sub>630</sub> of 0.3 with PBS. The widths of both the excitation slit and the emission slit were set to 5 nm. Fluorescence intensity and fluorescence micrographs were determined using a fluorescence spectrophotometer (F–280, Tianjin, Gangdong Sci & Tech Development Co., LTD, China) and fluorescence microscope (Olympus microscope (BX51, Japan) equipped with a digital microscope camera (DP72 Japan)). The DNA in C. <italic>michiganense</italic> subsp. <italic>sepedonicum</italic> was measured at an excitation wavelength of 364 nm and emission wavelength of 450 nm. The RNA in C. <italic>michiganense</italic> subsp. <italic>sepedonicum</italic> was measured at an excitation wavelength of 400 nm and an emission wavelength of 465 nm <xref rid="pone.0094329-Wang5" ref-type="bibr">[107]</xref>.</p><p>Bacteria genomic DNA was extracted using bacterial genomic DNA isolation kit (Shangon Biotech (Shanghai) Co., LTD, China). The purity of the extracted genomic DNA was evaluated by the optical density ratio of 260 to 280 nm (OD260/OD280 = 1.80). DNA was mixed with increasing amounts of Fr.3 (final concentrations were 1/5MIC, 1/2MIC, MIC, and 2MIC) at room temperature for 2 h. DNA from cells without Fr.3 treatment was used as the control. After adding 10 μL of loading buffer, the migration of DNA was assessed by electrophoresis using a 0.8% agarose gel in 1×TAE buffer and stained using EB. Gel retardation was visualized under UV illumination using a gel imaging system (Shanhai Jiapeng Technology Co., LTD, China) <xref rid="pone.0094329-Imura1" ref-type="bibr">[109]</xref>.</p><p>Bacteria genomic DNA (OD<sub>260</sub> = 0.5) was treated with Fr.3 at 1/5MIC, 1/2MIC, MIC, and 2MIC. DNA from cells without Fr.3 treatment was used as the control. After 5 h, the UV–visible spectra were measured at room temperature with a UV/VIS spectrophotometer (752pc, Shanhai Guangpu Instrument Co., LTD, China). Each sample solution was scanned from 220–380 nm.</p><p>Competitive binding assays were carried out as described by Li <xref rid="pone.0094329-Li3" ref-type="bibr">[110]</xref> with some modifications, using a F–280 fluorescence spectrophotometer (Tianjin Gangdong Sci & Tech Development Co., LTD, China). Bacteria genomic DNA was adjusted to an OD<sub>260</sub> of 0.5. Then these samples were treated with Fr.3 at 1/2MIC, MIC, and 2MIC. DNA from cells without Fr.3 treatment was used as the control. After 5 h, 15 μL EB (0.1 mg/mL) was added to the DNA solution (2 mL). The EB–DNA mixture was incubated in the dark and the fluorescence spectra were measured for each test solution after 15 minutes. The solutions were excited at 493 nm, and the spectra were recorded from 500 to 700 nm. The widths of both the excitation slit and the emission slit were set to 2 nm.</p><p>Cell cycle analysis was performed by staining DNA with propidium iodide (PI, Sigma–Aldrich). Cells were collected after being cultured with Fr.3 at 1/5MIC, 1/2MIC, and MIC concentrations for 8 h. The cells without Fr.3 treatment were used as the control. Cell cycle analysis was performed by fixing cells with 75% alcohol in PBS. Cells were collected by centrifugation, and then the pellet was resuspended in PI solution (50 μg/mL). Flow cytometric analysis was done with a FACS Calibur flow cytometer (Becton Dickinson) and the data were analyzed by Cellquest software <xref rid="pone.0094329-Muirhead1" ref-type="bibr">[111]</xref>.</p></sec></sec><sec id="s4e"><title>Statistical analysis</title><p>One–way analysis of variance (ANOVA) was performed on the data using the SPSS statistic program (Version 17.0). 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