H2O2 metabolism during sweet orange (Citrus sinensis L. Osb.) 'Hamlin' Xanthomonas axonopodis pv. citri interaction
Identifieur interne : 001949 ( Main/Exploration ); précédent : 001948; suivant : 001950H2O2 metabolism during sweet orange (Citrus sinensis L. Osb.) 'Hamlin' Xanthomonas axonopodis pv. citri interaction
Auteurs : Naveen Kumar [États-Unis] ; Robert C. Ebel [États-Unis] ; Pamela D. Roberts [États-Unis]Source :
- Scientia horticulturae [ 0304-4238 ] ; 2011.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Horticulture.
English descriptors
- KwdEn :
Abstract
Sweet orange (Citrus sinensis L. Osb.)'Hamlin' is a canker (Xanthomonas axonopodis pv. citri: Xac) susceptible citrus genotype grown commercially worldwide. Canker causes severe economic losses and restricts the marketability of crop for export. Little is known about the role of oxidative stress in canker development. In the present investigation, sweet orange'Hamlin' leaves were artificially inoculated with Xac to determine the impact of Xac infection on hydrogen peroxide (H2O2) metabolism. Characteristic symp- toms following artificial inoculation were water soaking of the infiltrated zone between 2 and 8 days after inoculation (dai); raised epidermis accompanying tiny yellow colored bacterial colonies at 8 dai; and yellowing and necrosis of the infected zone by 12-16 dai. In planta Xac population increased 1000 fold by 14dai from an initial population of 7.3 x 106 cfu cm-2 (0 dai). Peak concentrations of H2O2 were observed at 24 h and between 8 and 10 dai and coincided with higher activity of total superoxide dismu- tase (SOD). Lower levels of H2O2 in infected leaves were maintained by Xac induced higher activities of catalase (CAT), ascorbate peroxidase (APOD), and guaiacol peroxidase (POD). It appears Xac altered H2O2 metabolism in C. sinensis L. Osb. 'Hamlin' to enhance survival and growth.
Affiliations:
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">H<sub>2</sub>O<sub>2</sub> metabolism during sweet orange (Citrus sinensis L. Osb.) 'Hamlin' Xanthomonas axonopodis pv. citri interaction</title><author><name sortKey="Kumar, Naveen" sort="Kumar, Naveen" uniqKey="Kumar N" first="Naveen" last="Kumar">Naveen Kumar</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Southwest Florida Research and Education Center, Institute of Food and Agriculture Sciences, University of Florida</s1><s2>Immokalee, FL 34142</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Floride</region></placeName></affiliation></author><author><name sortKey="Ebel, Robert C" sort="Ebel, Robert C" uniqKey="Ebel R" first="Robert C." last="Ebel">Robert C. 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Roberts</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Southwest Florida Research and Education Center, Institute of Food and Agriculture Sciences, University of Florida</s1><s2>Immokalee, FL 34142</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Floride</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">11-0249245</idno><date when="2011">2011</date><idno type="stanalyst">PASCAL 11-0249245 INIST</idno><idno type="RBID">Pascal:11-0249245</idno><idno type="wicri:Area/PascalFrancis/Corpus">000173</idno><idno type="wicri:Area/PascalFrancis/Curation">000827</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000172</idno><idno type="wicri:Area/Main/Merge">001981</idno><idno type="wicri:Area/Main/Curation">001949</idno><idno type="wicri:Area/Main/Exploration">001949</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">H<sub>2</sub>O<sub>2</sub> metabolism during sweet orange (Citrus sinensis L. Osb.) 'Hamlin' Xanthomonas axonopodis pv. citri interaction</title><author><name sortKey="Kumar, Naveen" sort="Kumar, Naveen" uniqKey="Kumar N" first="Naveen" last="Kumar">Naveen Kumar</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Southwest Florida Research and Education Center, Institute of Food and Agriculture Sciences, University of Florida</s1><s2>Immokalee, FL 34142</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Floride</region></placeName></affiliation></author><author><name sortKey="Ebel, Robert C" sort="Ebel, Robert C" uniqKey="Ebel R" first="Robert C." last="Ebel">Robert C. Ebel</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Southwest Florida Research and Education Center, Institute of Food and Agriculture Sciences, University of Florida</s1><s2>Immokalee, FL 34142</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Floride</region></placeName></affiliation></author><author><name sortKey="Roberts, Pamela D" sort="Roberts, Pamela D" uniqKey="Roberts P" first="Pamela D." last="Roberts">Pamela D. Roberts</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Southwest Florida Research and Education Center, Institute of Food and Agriculture Sciences, University of Florida</s1><s2>Immokalee, FL 34142</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Floride</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Scientia horticulturae</title><title level="j" type="abbreviated">Sci. hortic.</title><idno type="ISSN">0304-4238</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Scientia horticulturae</title><title level="j" type="abbreviated">Sci. hortic.</title><idno type="ISSN">0304-4238</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Catalase</term><term>Citrus sinensis</term><term>Horticulture</term><term>Hydrogen peroxide</term><term>L-Ascorbate peroxidase</term><term>Metabolism</term><term>Reactive oxygen species</term><term>Xanthomonas axonopodis</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Métabolisme</term><term>Horticulture</term><term>Citrus sinensis</term><term>Xanthomonas axonopodis</term><term>Peroxyde d'hydrogène</term><term>L-Ascorbate peroxidase</term><term>Catalase</term><term>Espèces réactives de l'oxygène</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Horticulture</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Sweet orange (Citrus sinensis L. Osb.)'Hamlin' is a canker (Xanthomonas axonopodis pv. citri: Xac) susceptible citrus genotype grown commercially worldwide. Canker causes severe economic losses and restricts the marketability of crop for export. Little is known about the role of oxidative stress in canker development. In the present investigation, sweet orange'Hamlin' leaves were artificially inoculated with Xac to determine the impact of Xac infection on hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) metabolism. Characteristic symp- toms following artificial inoculation were water soaking of the infiltrated zone between 2 and 8 days after inoculation (dai); raised epidermis accompanying tiny yellow colored bacterial colonies at 8 dai; and yellowing and necrosis of the infected zone by 12-16 dai. In planta Xac population increased 1000 fold by 14dai from an initial population of 7.3 x 10<sup>6</sup> cfu cm<sup>-2</sup> (0 dai). Peak concentrations of H<sub>2</sub>O<sub>2</sub> were observed at 24 h and between 8 and 10 dai and coincided with higher activity of total superoxide dismu- tase (SOD). Lower levels of H<sub>2</sub>O<sub>2</sub> in infected leaves were maintained by Xac induced higher activities of catalase (CAT), ascorbate peroxidase (APOD), and guaiacol peroxidase (POD). It appears Xac altered H<sub>2</sub>O<sub>2</sub> metabolism in C. sinensis L. Osb. 'Hamlin' to enhance survival and growth.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Floride</li></region></list><tree><country name="États-Unis"><region name="Floride"><name sortKey="Kumar, Naveen" sort="Kumar, Naveen" uniqKey="Kumar N" first="Naveen" last="Kumar">Naveen Kumar</name></region><name sortKey="Ebel, Robert C" sort="Ebel, Robert C" uniqKey="Ebel R" first="Robert C." last="Ebel">Robert C. Ebel</name><name sortKey="Roberts, Pamela D" sort="Roberts, Pamela D" uniqKey="Roberts P" first="Pamela D." last="Roberts">Pamela D. Roberts</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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