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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en"><italic>Phomopsis longanae</italic>
Chi-Induced Changes in Activities of Cell Wall-Degrading Enzymes and Contents of Cell Wall Components in Pericarp of Harvested Longan Fruit and Its Relation to Disease Development</title>
<author><name sortKey="Chen, Yihui" sort="Chen, Yihui" uniqKey="Chen Y" first="Yihui" last="Chen">Yihui Chen</name>
<affiliation><nlm:aff id="aff1"><institution>Institute of Postharvest Technology of Agricultural Products, College of Food Science, Fujian Agriculture and Forestry University</institution>
,<addr-line>Fuzhou</addr-line>
,<country>China</country>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Zhang, Shen" sort="Zhang, Shen" uniqKey="Zhang S" first="Shen" last="Zhang">Shen Zhang</name>
<affiliation><nlm:aff id="aff1"><institution>Institute of Postharvest Technology of Agricultural Products, College of Food Science, Fujian Agriculture and Forestry University</institution>
,<addr-line>Fuzhou</addr-line>
,<country>China</country>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Lin, Hetong" sort="Lin, Hetong" uniqKey="Lin H" first="Hetong" last="Lin">Hetong Lin</name>
<affiliation><nlm:aff id="aff1"><institution>Institute of Postharvest Technology of Agricultural Products, College of Food Science, Fujian Agriculture and Forestry University</institution>
,<addr-line>Fuzhou</addr-line>
,<country>China</country>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Sun, Junzheng" sort="Sun, Junzheng" uniqKey="Sun J" first="Junzheng" last="Sun">Junzheng Sun</name>
<affiliation><nlm:aff id="aff1"><institution>Institute of Postharvest Technology of Agricultural Products, College of Food Science, Fujian Agriculture and Forestry University</institution>
,<addr-line>Fuzhou</addr-line>
,<country>China</country>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Lin, Yifen" sort="Lin, Yifen" uniqKey="Lin Y" first="Yifen" last="Lin">Yifen Lin</name>
<affiliation><nlm:aff id="aff1"><institution>Institute of Postharvest Technology of Agricultural Products, College of Food Science, Fujian Agriculture and Forestry University</institution>
,<addr-line>Fuzhou</addr-line>
,<country>China</country>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Wang, Hui" sort="Wang, Hui" uniqKey="Wang H" first="Hui" last="Wang">Hui Wang</name>
<affiliation><nlm:aff id="aff1"><institution>Institute of Postharvest Technology of Agricultural Products, College of Food Science, Fujian Agriculture and Forestry University</institution>
,<addr-line>Fuzhou</addr-line>
,<country>China</country>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Lin, Mengshi" sort="Lin, Mengshi" uniqKey="Lin M" first="Mengshi" last="Lin">Mengshi Lin</name>
<affiliation><nlm:aff id="aff2"><institution>Food Science Program, Division of Food System & Bioengineering, University of Missouri</institution>
,<addr-line>Columbia, MO</addr-line>
,<country>United States</country>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Shi, John" sort="Shi, John" uniqKey="Shi J" first="John" last="Shi">John Shi</name>
<affiliation><nlm:aff id="aff3"><institution>Guelph Food Research Center, Agriculture and Agri-Food Canada</institution>
,<addr-line>Guelph, ON</addr-line>
,<country>Canada</country>
</nlm:aff>
</affiliation>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">PMC</idno>
<idno type="pmid">29875756</idno>
<idno type="pmc">5974112</idno>
<idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5974112</idno>
<idno type="RBID">PMC:5974112</idno>
<idno type="doi">10.3389/fmicb.2018.01051</idno>
<date when="2018">2018</date>
<idno type="wicri:Area/Pmc/Corpus">000792</idno>
<idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000792</idno>
</publicationStmt>
<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main"><italic>Phomopsis longanae</italic>
Chi-Induced Changes in Activities of Cell Wall-Degrading Enzymes and Contents of Cell Wall Components in Pericarp of Harvested Longan Fruit and Its Relation to Disease Development</title>
<author><name sortKey="Chen, Yihui" sort="Chen, Yihui" uniqKey="Chen Y" first="Yihui" last="Chen">Yihui Chen</name>
<affiliation><nlm:aff id="aff1"><institution>Institute of Postharvest Technology of Agricultural Products, College of Food Science, Fujian Agriculture and Forestry University</institution>
,<addr-line>Fuzhou</addr-line>
,<country>China</country>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Zhang, Shen" sort="Zhang, Shen" uniqKey="Zhang S" first="Shen" last="Zhang">Shen Zhang</name>
<affiliation><nlm:aff id="aff1"><institution>Institute of Postharvest Technology of Agricultural Products, College of Food Science, Fujian Agriculture and Forestry University</institution>
,<addr-line>Fuzhou</addr-line>
,<country>China</country>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Lin, Hetong" sort="Lin, Hetong" uniqKey="Lin H" first="Hetong" last="Lin">Hetong Lin</name>
<affiliation><nlm:aff id="aff1"><institution>Institute of Postharvest Technology of Agricultural Products, College of Food Science, Fujian Agriculture and Forestry University</institution>
,<addr-line>Fuzhou</addr-line>
,<country>China</country>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Sun, Junzheng" sort="Sun, Junzheng" uniqKey="Sun J" first="Junzheng" last="Sun">Junzheng Sun</name>
<affiliation><nlm:aff id="aff1"><institution>Institute of Postharvest Technology of Agricultural Products, College of Food Science, Fujian Agriculture and Forestry University</institution>
,<addr-line>Fuzhou</addr-line>
,<country>China</country>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Lin, Yifen" sort="Lin, Yifen" uniqKey="Lin Y" first="Yifen" last="Lin">Yifen Lin</name>
<affiliation><nlm:aff id="aff1"><institution>Institute of Postharvest Technology of Agricultural Products, College of Food Science, Fujian Agriculture and Forestry University</institution>
,<addr-line>Fuzhou</addr-line>
,<country>China</country>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Wang, Hui" sort="Wang, Hui" uniqKey="Wang H" first="Hui" last="Wang">Hui Wang</name>
<affiliation><nlm:aff id="aff1"><institution>Institute of Postharvest Technology of Agricultural Products, College of Food Science, Fujian Agriculture and Forestry University</institution>
,<addr-line>Fuzhou</addr-line>
,<country>China</country>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Lin, Mengshi" sort="Lin, Mengshi" uniqKey="Lin M" first="Mengshi" last="Lin">Mengshi Lin</name>
<affiliation><nlm:aff id="aff2"><institution>Food Science Program, Division of Food System & Bioengineering, University of Missouri</institution>
,<addr-line>Columbia, MO</addr-line>
,<country>United States</country>
</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Shi, John" sort="Shi, John" uniqKey="Shi J" first="John" last="Shi">John Shi</name>
<affiliation><nlm:aff id="aff3"><institution>Guelph Food Research Center, Agriculture and Agri-Food Canada</institution>
,<addr-line>Guelph, ON</addr-line>
,<country>Canada</country>
</nlm:aff>
</affiliation>
</author>
</analytic>
<series><title level="j">Frontiers in Microbiology</title>
<idno type="eISSN">1664-302X</idno>
<imprint><date when="2018">2018</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
</fileDesc>
<profileDesc><textClass></textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en"><p>The main goal of this study was to investigate the influences of <italic>Phomopsis longanae</italic>
Chi infection on activities of cell wall-degrading enzymes (CWDEs), and contents of cell wall components in pericarp of harvested “Fuyan” longan (<italic>Dimocarpus longan</italic>
Lour. cv. Fuyan) fruit and its relation to disease development. The results showed that, compared with the control samples, <italic>P. longanae</italic>
-inoculated longans showed higher fruit disease index, lower content of pericarp cell wall materials (CWMs), as well as lower contents of pericarp cell wall components (chelate-soluble pectin (CSP), sodium carbonate-soluble pectin, hemicelluloses, and cellulose), but higher content of pericarp water-soluble pectin (WSP). In addition, the inoculation treatment with <italic>P. longanae</italic>
significantly promoted the activities of CWDEs including pectinesterase, polygalacturonase, β-galactosidase, and cellulase. The results suggested that the <italic>P. longanae</italic>
stimulated-disease development of harvested longans was due to increase in activities of pericarp CWDEs, which might accelerate the disassembly of pericarp cell wall components. In turn, resulting in the degradation of pericarp cell wall, reduction of pericarp mechanical strength, and subsequently leading to the breakdown of longan pericarp tissues. Eventually resulting in development of disease development and fruit decay in harvested longans during storage at 28°C.</p>
</div>
</front>
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</back>
</TEI>
<pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Front Microbiol</journal-id>
<journal-id journal-id-type="iso-abbrev">Front Microbiol</journal-id>
<journal-id journal-id-type="publisher-id">Front. Microbiol.</journal-id>
<journal-title-group><journal-title>Frontiers in Microbiology</journal-title>
</journal-title-group>
<issn pub-type="epub">1664-302X</issn>
<publisher><publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">29875756</article-id>
<article-id pub-id-type="pmc">5974112</article-id>
<article-id pub-id-type="doi">10.3389/fmicb.2018.01051</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Microbiology</subject>
<subj-group><subject>Original Research</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group><article-title><italic>Phomopsis longanae</italic>
Chi-Induced Changes in Activities of Cell Wall-Degrading Enzymes and Contents of Cell Wall Components in Pericarp of Harvested Longan Fruit and Its Relation to Disease Development</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Chen</surname>
<given-names>Yihui</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Zhang</surname>
<given-names>Shen</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Lin</surname>
<given-names>Hetong</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup>
</xref>
<xref ref-type="corresp" rid="c001"><sup>*</sup>
</xref>
<uri xlink:type="simple" xlink:href="http://loop.frontiersin.org/people/543391/overview"></uri>
</contrib>
<contrib contrib-type="author"><name><surname>Sun</surname>
<given-names>Junzheng</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Lin</surname>
<given-names>Yifen</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Wang</surname>
<given-names>Hui</given-names>
</name>
<xref ref-type="aff" rid="aff1"><sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Lin</surname>
<given-names>Mengshi</given-names>
</name>
<xref ref-type="aff" rid="aff2"><sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Shi</surname>
<given-names>John</given-names>
</name>
<xref ref-type="aff" rid="aff3"><sup>3</sup>
</xref>
</contrib>
</contrib-group>
<aff id="aff1"><sup>1</sup>
<institution>Institute of Postharvest Technology of Agricultural Products, College of Food Science, Fujian Agriculture and Forestry University</institution>
,<addr-line>Fuzhou</addr-line>
,<country>China</country>
</aff>
<aff id="aff2"><sup>2</sup>
<institution>Food Science Program, Division of Food System & Bioengineering, University of Missouri</institution>
,<addr-line>Columbia, MO</addr-line>
,<country>United States</country>
</aff>
<aff id="aff3"><sup>3</sup>
<institution>Guelph Food Research Center, Agriculture and Agri-Food Canada</institution>
,<addr-line>Guelph, ON</addr-line>
,<country>Canada</country>
</aff>
<author-notes><fn fn-type="edited-by"><p>Edited by: Nengguo Tao, Xiangtan University, China</p>
</fn>
<fn fn-type="edited-by"><p>Reviewed by: Jia Liu, Chongqing University of Arts and Sciences, China; José Ascención Martínez-Álvarez, University of Guanajuato, Mexico; Prashant Singh, Florida State University, United States</p>
</fn>
<corresp id="c001">*Correspondence: Hetong Lin, <email>hetonglin@126.com</email>
; <email>hetonglin@163.com</email>
</corresp>
<fn fn-type="other" id="fn002"><p>This article was submitted to Food Microbiology, a section of the journal Frontiers in Microbiology</p>
</fn>
</author-notes>
<pub-date pub-type="epub"><day>23</day>
<month>5</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="collection"><year>2018</year>
</pub-date>
<volume>9</volume>
<elocation-id>1051</elocation-id>
<history><date date-type="received"><day>31</day>
<month>3</month>
<year>2018</year>
</date>
<date date-type="accepted"><day>03</day>
<month>5</month>
<year>2018</year>
</date>
</history>
<permissions><copyright-statement>Copyright © 2018 Chen, Zhang, Lin, Sun, Lin, Wang, Lin and Shi.</copyright-statement>
<copyright-year>2018</copyright-year>
<copyright-holder>Chen, Zhang, Lin, Sun, Lin, Wang, Lin and Shi</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/"><license-p>This is an openaccess article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</license-p>
</license>
</permissions>
<abstract><p>The main goal of this study was to investigate the influences of <italic>Phomopsis longanae</italic>
Chi infection on activities of cell wall-degrading enzymes (CWDEs), and contents of cell wall components in pericarp of harvested “Fuyan” longan (<italic>Dimocarpus longan</italic>
Lour. cv. Fuyan) fruit and its relation to disease development. The results showed that, compared with the control samples, <italic>P. longanae</italic>
-inoculated longans showed higher fruit disease index, lower content of pericarp cell wall materials (CWMs), as well as lower contents of pericarp cell wall components (chelate-soluble pectin (CSP), sodium carbonate-soluble pectin, hemicelluloses, and cellulose), but higher content of pericarp water-soluble pectin (WSP). In addition, the inoculation treatment with <italic>P. longanae</italic>
significantly promoted the activities of CWDEs including pectinesterase, polygalacturonase, β-galactosidase, and cellulase. The results suggested that the <italic>P. longanae</italic>
stimulated-disease development of harvested longans was due to increase in activities of pericarp CWDEs, which might accelerate the disassembly of pericarp cell wall components. In turn, resulting in the degradation of pericarp cell wall, reduction of pericarp mechanical strength, and subsequently leading to the breakdown of longan pericarp tissues. Eventually resulting in development of disease development and fruit decay in harvested longans during storage at 28°C.</p>
</abstract>
<kwd-group><kwd>longan (<italic>Dimocarpus longan</italic>
Lour.)</kwd>
<kwd><italic>Phomopsis longanae</italic>
Chi</kwd>
<kwd>disease development</kwd>
<kwd>cell wall components</kwd>
<kwd>cell wall-degrading enzymes</kwd>
<kwd>cell wall disassembly</kwd>
</kwd-group>
<counts><fig-count count="5"></fig-count>
<table-count count="0"></table-count>
<equation-count count="0"></equation-count>
<ref-count count="38"></ref-count>
<page-count count="8"></page-count>
<word-count count="0"></word-count>
</counts>
</article-meta>
</front>
<body><sec><title>Introduction</title>
<p>In developed countries, fruit decay caused by pathogens affects 20–25% of the harvested fruits during post-harvest handling and storage. While in developing countries, the situation is even worse due to inadequate transportation, storage, and preservation facilities for fruits (<xref rid="B2" ref-type="bibr">Al-Hindi et al., 2011</xref>
). Infection by pathogenic bacteria and fungi could take place in almost every step of fruit production from pre-harvest to post-harvest storage and marketing (<xref rid="B35" ref-type="bibr">Yao and Tian, 2005</xref>
; <xref rid="B1" ref-type="bibr">Aghdam and Fard, 2017</xref>
; <xref rid="B20" ref-type="bibr">Li et al., 2017</xref>
).</p>
<p>In botanic cells, the cell wall is the first barrier against the infection by fungal pathogens (<xref rid="B18" ref-type="bibr">Kubicek et al., 2014</xref>
). Cell wall-degrading enzymes (CWDEs) secreted by pathogens play a key role in penetrating the cell wall to utilize the nutrients (<xref rid="B16" ref-type="bibr">Kang and Buchenauer, 2000</xref>
; <xref rid="B19" ref-type="bibr">Lalaoui et al., 2000</xref>
; <xref rid="B17" ref-type="bibr">Kikot et al., 2009</xref>
; <xref rid="B31" ref-type="bibr">Tian et al., 2009</xref>
; <xref rid="B14" ref-type="bibr">Gharbi et al., 2015</xref>
; <xref rid="B28" ref-type="bibr">Ramos et al., 2016</xref>
). There is a diverse array of CWDEs, including polygalacturonase (PG), pectin methylgalacturonase (PMG), pectinesterase (PE), pectin lyase (PL), pectate lyase (PNL), cellulase (C<sub>X</sub>
), β-glucosidase, and xylanases (<xref rid="B2" ref-type="bibr">Al-Hindi et al., 2011</xref>
; <xref rid="B21" ref-type="bibr">Li et al., 2012</xref>
; <xref rid="B18" ref-type="bibr">Kubicek et al., 2014</xref>
). <xref rid="B28" ref-type="bibr">Ramos et al. (2016)</xref>
found that <italic>Macrophomina phaseolina</italic>
induced the cell wall degradation of maize and sunflower, which was initiated by the pectinase that was the first CWDE secreted by <italic>M. phaseolina</italic>
. The activities of PG and PMG were higher than C<sub>X</sub>
that appeared in the later stage of the degradation process (<xref rid="B28" ref-type="bibr">Ramos et al., 2016</xref>
). This sequence promoted the initial tissue maceration before the degradation of cell wall materials (CWMs). It was reported that <italic>Fusarium culmorum</italic>
was able to secrete CWDEs including cellulases, xylanases, and pectinases. These CWDEs degraded the wheat spike plant tissues (cellulose, xylan, and pectin) and enabled the invasion to the tissues by <italic>F. culmorum</italic>
(<xref rid="B16" ref-type="bibr">Kang and Buchenauer, 2000</xref>
). <xref rid="B16" ref-type="bibr">Kang and Buchenauer (2000)</xref>
also reported that in the cell wall, the degree of pectin degradation was higher compared with cellulose and xylan at the early stage of infection, which implied that there might be earlier secretion or higher activity of pectinases over cellulases or xylanases. Moreover, <xref rid="B21" ref-type="bibr">Li et al. (2012)</xref>
showed that <italic>Botryodiplodia theobromae</italic>
Pat. caused the stem-end rot of mangoes by producing PG, PMG, and C<sub>X</sub>
that disrupted the fruit tissues in the deterioration process. Therefore, it can be concluded that the secretion of CWDEs plays an important role in the degradation of plant cell wall during pathogenesis.</p>
<p>Longan is a well-known subtropical fruit with a short shelf life at room temperature due to its high susceptibility to pathogenic infections (<xref rid="B8" ref-type="bibr">Chen et al., 2014</xref>
; <xref rid="B23" ref-type="bibr">Lin et al., 2017a</xref>
,<xref rid="B25" ref-type="bibr">b</xref>
,<xref rid="B26" ref-type="bibr">c</xref>
, <xref rid="B24" ref-type="bibr">2018</xref>
; <xref rid="B36" ref-type="bibr">Zhang et al., 2017</xref>
, <xref rid="B37" ref-type="bibr">2018</xref>
; <xref rid="B30" ref-type="bibr">Sun et al., 2018</xref>
). Our previous studies demonstrated that <italic>Phomopsis longanae</italic>
Chi (<italic>P. longanae</italic>
) is one of the dominating pathogens that can cause postharvest decay of longans (<xref rid="B9" ref-type="bibr">Chen et al., 2011a</xref>
,<xref rid="B10" ref-type="bibr">b</xref>
, <xref rid="B8" ref-type="bibr">2014</xref>
; <xref rid="B23" ref-type="bibr">Lin et al., 2017a</xref>
). To date, there has been no report on the types or activities of the CWDEs produced by <italic>P. longanae</italic>
, and there is still a lack of research regarding the effect of these enzymes on infected longan fruits. The objective of this study was to investigate the changes of CWDEs activities during disease development in <italic>P. longanae</italic>
-inoculated longan fruits and their effect on the degradation of cell wall. This study also aimed to elucidate the CWDEs’ function during the infection of <italic>P. longanae</italic>
on harvested longan fruits.</p>
</sec>
<sec sec-type="materials|methods" id="s1"><title>Materials and Methods</title>
<sec><title>Inoculation of Longan Fruits</title>
<p><italic>Phomopsis longanae</italic>
culturing and the preparation of spore suspension were performed as described in our previous publication (<xref rid="B8" ref-type="bibr">Chen et al., 2014</xref>
). The concentration of spore suspension was diluted to 1 × 10<sup>4</sup>
spores mL<sup>-1</sup>
and used for inoculation.</p>
<p>“Fuyan” longan (<italic>Dimocarpus longan</italic>
Lour. cv. Fuyan) fruit at commercial maturity were handpicked from a longan orchard (Quanzhou, Fujian, China). The harvested fruit were carefully packed and transported to a research laboratory in Fujian Agriculture and Forestry University (Fuzhou, Fujian, China) within 3 h and stored at 4°C. Fruit in uniform maturity and size were selected for the experiment and any rotten or damaged fruit were excluded.</p>
<p>The fruits were dipped in 0.5% sodium hypochlorite solution for 10 s to eliminate surface microorganisms, and then air-dried. A total of 150 fruits were employed to evaluate the properties of harvested fruits on day 0. The remaining 3000 fruits were randomly divided into two lots (1500 fruits per lot) for the control and <italic>P. longanae</italic>
-inoculated treatment. The control group (1500 fruits) was dipped into the sterile deionized water for 5 min. The <italic>P. longanae</italic>
-inoculated group (1500 fruits) was immersed into the <italic>P. longanae</italic>
spore suspension (1 × 10<sup>4</sup>
spores mL<sup>-1</sup>
) for 5 min. All fruits were then air dried and packed in a polyethylene bag with a thickness of 0.015 mm. Each bag contained 50 longan fruits and 30 bags were used for each treatment. The samples were then stored at 28°C with a relative humidity of 90%. For each treatment, three bags of fruit (total 150 longan fruits) were randomly selected on a daily basis during the storage period and used for the assessments of longan fruit. All the evaluations were conducted in triplicate.</p>
</sec>
<sec><title>Assessment of the Index of Fruit Disease</title>
<p>Longan fruit disease was assessed based on our previous study (<xref rid="B8" ref-type="bibr">Chen et al., 2014</xref>
). The lesion proportion on fruit surface of 50 individual longan fruits was measured and defined to five disease scales. The calculations of fruit disease index were performed based on the method of <xref rid="B8" ref-type="bibr">Chen et al. (2014)</xref>
.</p>
</sec>
<sec><title>Preparation of CWM</title>
<p>Extraction of CWM was based on the modified procedures described in <xref rid="B13" ref-type="bibr">Duan et al. (2011)</xref>
and <xref rid="B6" ref-type="bibr">Chen et al. (2017a</xref>
,<xref rid="B7" ref-type="bibr">b</xref>
). Ten grams of frozen longan pericarp were homogenized in 200 mL of 80 % ethanol. The mixture was boiled for 30 min with stirring. The solution was then cooled to room temperature, followed by filtration with filter papers (ϕ11 cm Medium-Speed, Whatman, Zhejiang, China). The residues were subsequently washed with 200 mL of 80% ethanol, immersed into 50 mL of 90 % dimethyl sulfoxide for 8 h to remove starches. It was subsequently washed with 200 mL of acetone, dried for 3 days at 40°C to report the final weight as CWM.</p>
</sec>
<sec><title>Fractionation and Analysis of Cell Wall Components</title>
<p>Cell wall components fractionation and analysis were followed the procedures reported in <xref rid="B29" ref-type="bibr">Rugkong et al. (2010)</xref>
and <xref rid="B6" ref-type="bibr">Chen et al. (2017a</xref>
,<xref rid="B7" ref-type="bibr">b</xref>
) with some modifications. Water-soluble pectin (WSP) was extracted via dispersing CWM (300 mg) in sodium acetate buffer (50 mmol L<sup>-1</sup>
, pH 6.5) for 6 h with shaking (SKY-200B, SUKUN, Shanghai, China). The mixture was then centrifuged (10,000 × <italic>g</italic>
, 4°C) for 10 min (Centrifuge 5810R, Eppendorf AG, Hamburg, Germany). The sediment was immersed in 20 mL of 50 mmol L<sup>-1</sup>
ethylene diamine tetraacetic acid (EDTA) with 1 mol L<sup>-1</sup>
NaCl (pH 6.8). After shaking and centrifugation, the supernatant containing chelate-soluble pectin (CSP) was collected. Residues were further immersed in 20 mL of 50 mmol L<sup>-1</sup>
Na<sub>2</sub>
CO<sub>3</sub>
with 20 mmol L<sup>-1</sup>
NaBH<sub>4</sub>
for another shaking and centrifugation. The supernatant containing Na<sub>2</sub>
CO<sub>3</sub>
-soluble pectin (NSP) was collected. The remaining residue was further dipped in 10 mL of 4 mmol L<sup>-1</sup>
KOH solution with 100 mmol L<sup>-1</sup>
NaBH<sub>4</sub>
for shaking and centrifugation, and the supernatant collected was considered as hemicellulose. A volume of 1% sodium sulfite and 50 mL of 8 mol L<sup>-1</sup>
KOH solution with 10 mmol L<sup>-1</sup>
NaBH<sub>4</sub>
were then added to the remaining residue for shaking and centrifugation, and the supernatant containing cellulose was collected. The amounts of WSP, CSP, and NSP were determined via m-hydroxydiphenyl method (<xref rid="B33" ref-type="bibr">Wang et al., 2015</xref>
; <xref rid="B6" ref-type="bibr">Chen et al., 2017a</xref>
,<xref rid="B7" ref-type="bibr">b</xref>
). The amount of hemicellulose and cellulose were determined based on the anthrone method (<xref rid="B33" ref-type="bibr">Wang et al., 2015</xref>
; <xref rid="B6" ref-type="bibr">Chen et al., 2017a</xref>
,<xref rid="B7" ref-type="bibr">b</xref>
).</p>
</sec>
<sec><title>Extraction and Assay of CWDEs</title>
<p>Enzyme extraction was based on the procedures described by <xref rid="B3" ref-type="bibr">Andrews and Li (1995)</xref>
and <xref rid="B6" ref-type="bibr">Chen et al. (2017a</xref>
,<xref rid="B7" ref-type="bibr">b</xref>
). Briefly, frozen longan pericarp (1 g) was ground with 8 mL of 40 mmol L<sup>-1</sup>
sodium acetate buffer (containing 100 mmol L<sup>-1</sup>
NaCl, 2% mercaptoethanol and 5% PVP, pH 5.2). The homogenous solution was centrifuged (12,000 × <italic>g</italic>
, 20 min) at 4°C. The collected supernatant was used to measure the activities of PE, PG, β-galactosidase and cellulase.</p>
<p>Pectinesterase activity was measured by combining 3 mL of crude enzyme with 10 mL of 1% pectin for the titration using 0.01 mol L<sup>-1</sup>
NaOH (pH 7.4 at 37°C for 30 min). The amount of enzyme that consumed 1 μmol NaOH solution per hour was used to define one unit of PE activity.</p>
<p>Polygalacturonase activity was determined by mixing 5 mL of 20 mmol L<sup>-1</sup>
sodium acetate (pH 4.0), 2 mL of 1% (<italic>w</italic>
/<italic>v</italic>
) polygalacturonic acid, and 1 mL of crude enzyme extract, followed by incubation at 37°C for the 30 min. A volume of 2 mL of 10 mmol L<sup>-1</sup>
Na<sub>2</sub>
B<sub>4</sub>
O<sub>7</sub>
was then added to the reaction mixture before terminating the reaction with 0.1 mL of 1% (<italic>w</italic>
/<italic>v</italic>
) 2-cyanoacetamide and boiling for 5 min. The boiled reaction mixture without adding substrate was used as the blank. The concentrations of the reducing groups were measured at 276 nm with <sc>D</sc>
-galacturonic acid as the standard. The amount of enzyme producing 1 μmol galacturonic acid per hour was considered as one unit of PG activity.</p>
<p>To determine the β-galactosidase activity, 5 mL of 20 mmol L<sup>-1</sup>
sodium acetate (pH 4.7), 2 mL of 3 mmol L<sup>-1</sup>
<italic>p-</italic>
nitrophenyl-β-D-galactopyranoside, and 1 mL of crude enzyme were combined and incubated at 37°C for 30 min. A volume of 2 mL of 0.2 mmol L<sup>-1</sup>
Na<sub>2</sub>
CO<sub>3</sub>
was then added to the mixture. The concentration of the reducing product was determined at 400 nm with <italic>p</italic>
-nitrophenol (PNP) as a standard. One unit of β-galactosidase activity referred to the amount of enzyme that produced 1 μmol PNP per hour.</p>
<p>Cellulase activity was assayed by mixing 5 mL of 20 mmol L<sup>-1</sup>
sodium acetate (pH 4.0), 1 mL of 0.25% carboxymethyl cellulose, and 1 mL of crude enzyme extract. The mixture was incubated at 37°C for 30 min followed by addition of 2 mL of 10 mmol L<sup>-1</sup>
Na<sub>2</sub>
B<sub>4</sub>
O<sub>7</sub>
and 0.1 mL of 1% (<italic>w</italic>
/<italic>v</italic>
) 2-cyanoacetamide. The reaction was stopped by heating in a boiling water bath for 5 min. A blank was prepared for each sample by boiling the reaction mixture before addition of substrate. One unit of cellulase activity referred to the amount of enzyme that produced 1 μg D-glucose per hour.</p>
<p>The activities of CWDEs were presented as U mg<sup>-1</sup>
protein. Protein content was measured following the method of <xref rid="B4" ref-type="bibr">Bradford (1976)</xref>
using bovine serum as standard.</p>
</sec>
<sec><title>Statistical Analysis</title>
<p>All experiments were repeated three time and data were acquired. The values in figures were expressed in the format of the mean values and standard errors. Analysis of variance (ANOVA) was used to analyze the data using the software (SPSS version 17.0). Student’s <italic>t</italic>
-test was used to compare the mean values of the data set. A <italic>P</italic>
-value of less than or equal to 0.05 or 0.01 was considered statistically significant.</p>
</sec>
</sec>
<sec><title>Results and Discussion</title>
<sec><title>Changes in Fruit Disease Index</title>
<p>As indicated in <bold>Figure <xref ref-type="fig" rid="F1">1</xref>
</bold>
, control fruits were intact without lesion during the first two storage days, and then the fruit disease index gradually increased with further storage. But the disease index of <italic>P. longanae</italic>
-inoculated fruit increased rapidly throughout the storage period. Statistical analysis reveals that <italic>P. longanae</italic>
-inoculated fruit had consistently higher fruit disease index than the control fruit at the same storage time (<italic>P</italic>
< 0.01). After 5 days of storage, the disease index of <italic>P. longanae</italic>
-inoculated longans was 0.9, which was almost twice as high as that of the control longans. This clearly demonstrates that inoculation treatment could significantly increase disease development of longans during storage.</p>
<fig id="F1" position="float"><label>FIGURE 1</label>
<caption><p>Effects of <italic>Phomopsis longanae</italic>
infection on fruit disease index of harvested longan fruit during storage at 28°C. The asterisks indicate significant difference between control and <italic>P. longanae</italic>
-inoculated fruit (<sup>∗∗</sup>
<italic>P</italic>
< 0.01). ∘, control; •, <italic>P. longanae</italic>
-inoculation treatment.</p>
</caption>
<graphic xlink:href="fmicb-09-01051-g001"></graphic>
</fig>
</sec>
<sec><title>Changes in CWM</title>
<p>As shown in <bold>Figure <xref ref-type="fig" rid="F2">2</xref>
</bold>
, the pericarp CWM content decreased rapidly during storage and CWM readings of <italic>P. longanae</italic>
-inoculated longans was significantly (<italic>P</italic>
< 0.05) lower than the control longans on each storage day. After 5 days of storage, the CWM in pericarp of control longans decreased from 12.18 to 6.23 mg g<sup>-1</sup>
, while <italic>P. longanae</italic>
-inoculated longans has a pericarp CWM value of 5.08 mg g<sup>-1</sup>
on storage day 5. Correlation analysis indicates that there was a significant negative correlation between disease index (<italic>y</italic>
) and CWM content (<italic>x</italic>
) (<italic>y</italic>
= 1.5173-0.1362 <italic>x</italic>
, <italic>r</italic>
= -0.915, <italic>P</italic>
< 0.05) for the <italic>P. longanae</italic>
-inoculated longans during storage. These findings indicate that the disease development or loss of disease resistance of longan fruits during storage could lead to cell wall disassembly.</p>
<fig id="F2" position="float"><label>FIGURE 2</label>
<caption><p>Effects of <italic>P. longanae</italic>
infection on cell wall material (CWM) in pericarp of harvested longan fruit during storage at 28°C. The asterisks indicate significant difference between control and <italic>P. longanae</italic>
-inoculated fruit (<sup>∗</sup>
<italic>P</italic>
< 0.05). ∘, control; •, <italic>P. longanae</italic>
-inoculation treatment.</p>
</caption>
<graphic xlink:href="fmicb-09-01051-g002"></graphic>
</fig>
</sec>
<sec><title>Changes in Cell Wall Components</title>
<p>Cell wall components including pectic substances, hemicelluloses, and cellulose constitute the material basis for the mechanical properties of cell wall, and also for maintaining the mechanical strength of the pericarp (<xref rid="B15" ref-type="bibr">Huang et al., 1999</xref>
; <xref rid="B32" ref-type="bibr">Vorwerk et al., 2004</xref>
). Pectic substances like WSP, CSP, and NSP are located in the primary cell wall and the middle lamella. The degradation of pectic substances led to cellulose and hemicellulose disassembly, which caused pericarp tissue loosing or fruit softening (<xref rid="B12" ref-type="bibr">Duan et al., 2008</xref>
; <xref rid="B38" ref-type="bibr">Zhou et al., 2011</xref>
; <xref rid="B6" ref-type="bibr">Chen et al., 2017a</xref>
,<xref rid="B7" ref-type="bibr">b</xref>
). In a similar study performed on litchi fruit, higher levels of structural materials like insoluble pectin, hemicellulose, and cellulose were observed in the cell walls of ‘Huaizhi’ litchi fruit pericarp compared with ‘Nuomici’ litchis, which might notably correlate to better pericarp structural strength (<xref rid="B15" ref-type="bibr">Huang et al., 1999</xref>
).</p>
<p>The data acquired from this work indicate that <italic>P. longanae</italic>
-inoculated longans had a faster increase in pericarp WSP than the control longans (<bold>Figure <xref ref-type="fig" rid="F3">3A</xref>
</bold>
). <italic>P. longanae</italic>
-inoculated longans also had faster reduction in pericarp CSP contents (<bold>Figure <xref ref-type="fig" rid="F3">3B</xref>
</bold>
), NSP (<bold>Figure <xref ref-type="fig" rid="F3">3C</xref>
</bold>
), hemicellulose (<bold>Figure <xref ref-type="fig" rid="F4">4A</xref>
</bold>
), and cellulose (<bold>Figure <xref ref-type="fig" rid="F4">4B</xref>
</bold>
) than the control longans. Furthermore, fruit disease index (<italic>y</italic>
) shows negative correlations with CSP content (<italic>x</italic>
) (<italic>y</italic>
= 1.6142-8.7271 <italic>x</italic>
, <italic>r</italic>
= -0.971, <italic>P</italic>
< 0.01), NSP content (<italic>x</italic>
) (<italic>y</italic>
= 1.1252-2.9018 <italic>x</italic>
, <italic>r</italic>
= -0.962, <italic>P</italic>
< 0.01), hemicellulose (<italic>x</italic>
) (<italic>y</italic>
= 1.0903-2.584 <italic>x</italic>
, <italic>r</italic>
= -0.916, <italic>P</italic>
< 0.05) and cellulose (<italic>x</italic>
) (<italic>y</italic>
= 1.58-0.4145 <italic>x</italic>
, <italic>r</italic>
= -0.956, <italic>P</italic>
< 0.01) in pericarp of <italic>P. longanae</italic>
-inoculated longan fruit during storage. However, a positive correlation between fruit disease index (<italic>y</italic>
) and WSP content (<italic>x</italic>
) (<italic>y</italic>
= -0.5308 + 8.3717 <italic>x</italic>
, <italic>r</italic>
= 0.972, <italic>P</italic>
< 0.01) in pericarp of <italic>P. longanae</italic>
-inoculated longan fruit was observed. In short, <italic>P. longanae</italic>
-inoculation treatment accelerated the degradation of the cell wall components including CSP, NSP, hemicellulose, and cellulose in longans pericarp cell wall and middle lamella; however, the degraded cell wall components like WSP was elevated. Therefore, the mechanical strength of the cell wall of longan pericarp was decreased during disease development. Cell wall disassembly of longan pericarp may facilitate further pathogen invasion and dissemination.</p>
<fig id="F3" position="float"><label>FIGURE 3</label>
<caption><p>Effects of <italic>P. longanae</italic>
infection on water-soluble pectin (WSP) <bold>(A)</bold>
, chelate-soluble pectin (CSP) <bold>(B)</bold>
and sodium carbonate-soluble pectin <bold>(C)</bold>
in pericarp of harvested longan fruit during storage at 28°C. The asterisks indicate significant difference between control and <italic>P. longanae</italic>
-inoculated fruit (<sup>∗</sup>
<italic>P</italic>
< 0.05, <sup>∗∗</sup>
<italic>P</italic>
< 0.01). ∘, control; •, <italic>P. longanae</italic>
-inoculation treatment.</p>
</caption>
<graphic xlink:href="fmicb-09-01051-g003"></graphic>
</fig>
<fig id="F4" position="float"><label>FIGURE 4</label>
<caption><p>Effects of <italic>P. longanae</italic>
infection on hemicellulose <bold>(A)</bold>
and cellulose <bold>(B)</bold>
in pericarp of harvested longan fruit during storage at 28°C. The asterisks indicate significant difference between control and <italic>P. longanae</italic>
-inoculated fruit (<sup>∗</sup>
<italic>P</italic>
< 0.05, <sup>∗∗</sup>
<italic>P</italic>
< 0.01). ∘, control; •, <italic>P. longanae</italic>
-inoculation treatment.</p>
</caption>
<graphic xlink:href="fmicb-09-01051-g004"></graphic>
</fig>
</sec>
<sec><title>Changes in Cell Wall Degrading Enzymes</title>
<p>To further explain the change of cell wall components during disease development, changes in CWDEs were measured. PE and PG activities in pericarp of control fruit rose gradually toward the maximum on day 4 and decreased afterwards (<bold>Figures <xref ref-type="fig" rid="F5">5A,B</xref>
</bold>
). The PE and PG activities in pericarp of <italic>P. longanae</italic>
-inoculated longans followed a similar trend as the control longans but had significantly (<italic>P</italic>
< 0.05) higher activities (<bold>Figures <xref ref-type="fig" rid="F5">5A,B</xref>
</bold>
). It has been reported that the softening of pericarp tissues were associated with the changes in pectic substances, which could be attributed to the action of PE and PG (<xref rid="B27" ref-type="bibr">Liu et al., 2006</xref>
). Specifically, PE can remove the methoxyl groups and catalyze the decomposition of galacturonic acid polymer to polygalacturonic acid, which enables PG to hydrolyze 1, 4-α-<sc>D</sc>
-galacturonic bond of polygalacturonic acid to generate galacturonic acid (<xref rid="B27" ref-type="bibr">Liu et al., 2006</xref>
; <xref rid="B22" ref-type="bibr">Lin et al., 2007</xref>
; <xref rid="B29" ref-type="bibr">Rugkong et al., 2010</xref>
; <xref rid="B34" ref-type="bibr">Wei et al., 2010</xref>
). The degradation of pectic substances by the joint action of PE and PG can destroy the structure of middle lamella and decrease the mechanical strength of cell wall (<xref rid="B11" ref-type="bibr">Deng et al., 2005</xref>
; <xref rid="B27" ref-type="bibr">Liu et al., 2006</xref>
). In the present work, PE and PG activities increased significantly after inoculation treatment, which promoted the depolymerization and dissolution of pectin.</p>
<fig id="F5" position="float"><label>FIGURE 5</label>
<caption><p>Effects of <italic>P. longanae</italic>
infection on activities of pectinesterase <bold>(A)</bold>
, polygalacturonase <bold>(B)</bold>
, β-galactosidase <bold>(C)</bold>
, and cellulase <bold>(D)</bold>
in pericarp of harvested longan fruit during storage at 28°C. The asterisks indicate significant difference between control and <italic>P. longanae</italic>
-inoculated fruit (<sup>∗</sup>
<italic>P</italic>
< 0.05, <sup>∗∗</sup>
<italic>P</italic>
< 0.01). ∘, control; •, <italic>P. longanae</italic>
-inoculation treatment.</p>
</caption>
<graphic xlink:href="fmicb-09-01051-g005"></graphic>
</fig>
<p>As indicated in <bold>Figure <xref ref-type="fig" rid="F5">5C</xref>
</bold>
, β-galactosidase activity in pericarp of <italic>P. longanae</italic>
-inoculated longans exhibited a sharp increase on the first day of storage, then changed mildly on the second storage day, followed by a quick decline from days 2 to 4, and a rapid increase on day 5. However, the β-galactosidase activity in pericarp of the control longans increased steadily with progressing storage time, with significantly (<italic>P</italic>
< 0.01) lower level in contrast to that of <italic>P. longanae</italic>
-inoculated fruit from day 1 to day 4 (<bold>Figure <xref ref-type="fig" rid="F5">5C</xref>
</bold>
). β-galactosidase also plays a key role in the depolymerization and dissolution of pectic substances in fruits. It can hydrolyze β-1, 4-galactan bonds and separate galactosyl residues from pectin side chains, which may trigger some adverse reactions such as the production of ethylene and stress reaction, and thus further accelerate the disruption of cell wall structure (<xref rid="B27" ref-type="bibr">Liu et al., 2006</xref>
; <xref rid="B22" ref-type="bibr">Lin et al., 2007</xref>
; <xref rid="B34" ref-type="bibr">Wei et al., 2010</xref>
; <xref rid="B6" ref-type="bibr">Chen et al., 2017a</xref>
,<xref rid="B7" ref-type="bibr">b</xref>
). The results of this study suggest that higher levels of β-galactosidase activity in inoculated fruits during storage contributed to the degradation of pectin polysaccharides.</p>
<p>Cellulose activity increased gradually in both control and <italic>P. longanae</italic>
-inoculated longans during storage days 1–4 and then decreased (<bold>Figure <xref ref-type="fig" rid="F5">5D</xref>
</bold>
). After 5 days of storage, <italic>P. longanae</italic>
-inoculated longans showed 72.5% higher value of pericarp cellulose activity as compared with the control longans. Cellulase is a multi-enzyme system including endo-1, 4-β-D-glucanase, exo-1, 4-β-D-glucanase, and β-1, 4-glucosidase (<xref rid="B22" ref-type="bibr">Lin et al., 2007</xref>
). Cellulase could cause the degradation of cellulose and xyloglucan in cell wall structure, which resulted in pericarp tissue loosing and fruit softening (<xref rid="B11" ref-type="bibr">Deng et al., 2005</xref>
; <xref rid="B27" ref-type="bibr">Liu et al., 2006</xref>
; <xref rid="B38" ref-type="bibr">Zhou et al., 2011</xref>
; <xref rid="B5" ref-type="bibr">Bu et al., 2013</xref>
; <xref rid="B6" ref-type="bibr">Chen et al., 2017a</xref>
,<xref rid="B7" ref-type="bibr">b</xref>
). In this study, the enhanced activity of cellulase due to the <italic>P. longanae</italic>
-inoculation treatment correlated well with cellulose degradation (<bold>Figure <xref ref-type="fig" rid="F4">4B</xref>
</bold>
) in pericarp of longan fruit during storage.</p>
</sec>
</sec>
<sec><title>Conclusion</title>
<p>In summary, as compared with the control, fruit inoculated with <italic>P. longanae</italic>
could lead to significantly higher fruit disease index, increased activity of CWDEs (e.g., PE, PG, β-galactosidase and cellulose), and lower levels of CWM and cell wall components (such as CSP, NSP, hemicelluloses, and cellulose) in pericarp of harvested longan fruit. These results indicate that <italic>P. longanae</italic>
infection can accelerate the cell wall degradation of longan pericarp during disease development by promoting CWDEs activities, which decreased the mechanical strength of the cell walls, resulting in longan pericarp tissue softening, and eventually leading to fruit decay.</p>
</sec>
<sec><title>Author Contributions</title>
<p>YC and HL designed the research. SZ, JZS, YL, and HW conducted the experiments and analyzed the data. YC and SZ wrote the manuscript. HL revised the manuscript. ML and JS edited English language of the manuscript. All authors approved the submission and publication of the manuscript.</p>
</sec>
<sec><title>Conflict of Interest Statement</title>
<p>The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
</body>
<back><fn-group><fn fn-type="financial-disclosure"><p><bold>Funding.</bold>
This work was supported by the National Natural Science Foundation of China (Grant Nos. 31772035, 31671914, and 31171776), the Natural Science Foundation of Fujian Province of China (Grant No. 2017J01429), the Construction Projects of Top University at Fujian Agriculture and Forestry University of China (Grant No. 612014042), the Science Fund for Distinguished Young Scholars at Fujian Province of China (Grant No. KLa16036A), and the Science Fund for Distinguished Young Scholars at Fujian Agriculture and Forestry University of China (Grant No. XJQ201512).</p>
</fn>
</fn-group>
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