Protection of citrus rootstocks against Phytophthora spp. with a hypovirulent isolate of Phytophthora nicotianae
Identifieur interne : 000435 ( PascalFrancis/Checkpoint ); précédent : 000434; suivant : 000436Protection of citrus rootstocks against Phytophthora spp. with a hypovirulent isolate of Phytophthora nicotianae
Auteurs : G. C. Colburn [États-Unis] ; J. H. Graham [États-Unis]Source :
- Phytopathology [ 0031-949X ] ; 2007.
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Abstract
Phytophthora root rot of citrus in Florida is caused by Phytophthora nicotianae and P. palmivora. A naturally occurring isolate of P. nicotianae (Pnl 17) was characterized as hypovirulent on citrus roots. Pnl 17 infected and colonized fibrous roots, but caused significantly less disease than the virulent isolates P. nicotianae Pn198 and P. palmivora Pp99. Coincident inoculation of rootstock seedlings of Cleopatra mandarin (Citrus reticulata) or Swingle citrumelo (C. paradisi x Poncirus trifoliata) with the hypovirulent Pn117 and the virulent isolates Pn198 and Pp99 did not reduce the severity of disease caused by the virulent Phytophthora spp. When either rootstock was inoculated with the hypovirulent Pn117 for 3 days prior to inoculation with virulent isolates, preinoculated seedlings had significantly less disease and greater root weight compared with seedlings inoculated with the virulent isolates alone. Recovery of the different colony types of Phytophthora spp. from roots of sweet orange (C. sinensis) or Swingle citrumelo was evaluated on semiselective medium after sequential inoculations with the hypovirulent Pn117 and virulent Pp99. Pn117 was isolated from roots at the same level as the Pp99 at 3 days post inoculation. Preinoculation of Pn117 for 3 days followed by inoculation with Pp99 resulted in greater recovery of the hypovirulent isolate and lower recovery of the virulent compared with coincident inoculation.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Protection of citrus rootstocks against Phytophthora spp. with a hypovirulent isolate of Phytophthora nicotianae</title><author><name sortKey="Colburn, G C" sort="Colburn, G C" uniqKey="Colburn G" first="G. C." last="Colburn">G. C. Colburn</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>University of Florida, Citrus Research and Education Center, Department of Soil and Water Science, 700 Experiment Station Road</s1><s2>Lake Alfred 33850</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Lake Alfred 33850</wicri:noRegion></affiliation></author><author><name sortKey="Graham, J H" sort="Graham, J H" uniqKey="Graham J" first="J. H." last="Graham">J. H. Graham</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>University of Florida, Citrus Research and Education Center, Department of Soil and Water Science, 700 Experiment Station Road</s1><s2>Lake Alfred 33850</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Lake Alfred 33850</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">07-0388805</idno><date when="2007">2007</date><idno type="stanalyst">PASCAL 07-0388805 INIST</idno><idno type="RBID">Pascal:07-0388805</idno><idno type="wicri:Area/PascalFrancis/Corpus">000465</idno><idno type="wicri:Area/PascalFrancis/Curation">000539</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000435</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Protection of citrus rootstocks against Phytophthora spp. with a hypovirulent isolate of Phytophthora nicotianae</title><author><name sortKey="Colburn, G C" sort="Colburn, G C" uniqKey="Colburn G" first="G. C." last="Colburn">G. C. Colburn</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>University of Florida, Citrus Research and Education Center, Department of Soil and Water Science, 700 Experiment Station Road</s1><s2>Lake Alfred 33850</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Lake Alfred 33850</wicri:noRegion></affiliation></author><author><name sortKey="Graham, J H" sort="Graham, J H" uniqKey="Graham J" first="J. H." last="Graham">J. H. Graham</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>University of Florida, Citrus Research and Education Center, Department of Soil and Water Science, 700 Experiment Station Road</s1><s2>Lake Alfred 33850</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Lake Alfred 33850</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Phytopathology</title><title level="j" type="abbreviated">Phytopathology</title><idno type="ISSN">0031-949X</idno><imprint><date when="2007">2007</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Phytopathology</title><title level="j" type="abbreviated">Phytopathology</title><idno type="ISSN">0031-949X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Citrus reticulata</term><term>Florida</term><term>Isolate</term><term>Microbiology</term><term>Phytophthora nicotianae</term><term>Plant</term><term>Plant pathogen</term><term>Plant pathology</term><term>Poncirus trifoliata</term><term>Root</term><term>Seedlings</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Citrus reticulata</term><term>Phytophthora nicotianae</term><term>Poncirus trifoliata</term><term>Isolat</term><term>Racine</term><term>Floride</term><term>Plant semis</term><term>Microbiologie</term><term>Phytopathologie</term><term>Phytopathogène</term><term>Plante</term><term>Poncirus trifoliata Citrus paradisi</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Phytophthora root rot of citrus in Florida is caused by Phytophthora nicotianae and P. palmivora. A naturally occurring isolate of P. nicotianae (Pnl 17) was characterized as hypovirulent on citrus roots. Pnl 17 infected and colonized fibrous roots, but caused significantly less disease than the virulent isolates P. nicotianae Pn198 and P. palmivora Pp99. Coincident inoculation of rootstock seedlings of Cleopatra mandarin (Citrus reticulata) or Swingle citrumelo (C. paradisi x Poncirus trifoliata) with the hypovirulent Pn117 and the virulent isolates Pn198 and Pp99 did not reduce the severity of disease caused by the virulent Phytophthora spp. When either rootstock was inoculated with the hypovirulent Pn117 for 3 days prior to inoculation with virulent isolates, preinoculated seedlings had significantly less disease and greater root weight compared with seedlings inoculated with the virulent isolates alone. Recovery of the different colony types of Phytophthora spp. from roots of sweet orange (C. sinensis) or Swingle citrumelo was evaluated on semiselective medium after sequential inoculations with the hypovirulent Pn117 and virulent Pp99. Pn117 was isolated from roots at the same level as the Pp99 at 3 days post inoculation. Preinoculation of Pn117 for 3 days followed by inoculation with Pp99 resulted in greater recovery of the hypovirulent isolate and lower recovery of the virulent compared with coincident inoculation.</div></front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0031-949X</s0></fA01><fA02 i1="01"><s0>PHYTAJ</s0></fA02><fA03 i2="1"><s0>Phytopathology</s0></fA03><fA05><s2>97</s2></fA05><fA06><s2>8</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Protection of citrus rootstocks against Phytophthora spp. with a hypovirulent isolate of Phytophthora nicotianae</s1></fA08><fA11 i1="01" i2="1"><s1>COLBURN (G. C.)</s1></fA11><fA11 i1="02" i2="1"><s1>GRAHAM (J. H.)</s1></fA11><fA14 i1="01"><s1>University of Florida, Citrus Research and Education Center, Department of Soil and Water Science, 700 Experiment Station Road</s1><s2>Lake Alfred 33850</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></fA14><fA20><s1>958-963</s1></fA20><fA21><s1>2007</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>674</s2><s5>354000161464750080</s5></fA43><fA44><s0>0000</s0><s1>© 2007 INIST-CNRS. All rights reserved.</s1></fA44><fA45><s0>25 ref.</s0></fA45><fA47 i1="01" i2="1"><s0>07-0388805</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Phytopathology</s0></fA64><fA66 i1="01"><s0>USA</s0></fA66><fC01 i1="01" l="ENG"><s0>Phytophthora root rot of citrus in Florida is caused by Phytophthora nicotianae and P. palmivora. A naturally occurring isolate of P. nicotianae (Pnl 17) was characterized as hypovirulent on citrus roots. Pnl 17 infected and colonized fibrous roots, but caused significantly less disease than the virulent isolates P. nicotianae Pn198 and P. palmivora Pp99. Coincident inoculation of rootstock seedlings of Cleopatra mandarin (Citrus reticulata) or Swingle citrumelo (C. paradisi x Poncirus trifoliata) with the hypovirulent Pn117 and the virulent isolates Pn198 and Pp99 did not reduce the severity of disease caused by the virulent Phytophthora spp. When either rootstock was inoculated with the hypovirulent Pn117 for 3 days prior to inoculation with virulent isolates, preinoculated seedlings had significantly less disease and greater root weight compared with seedlings inoculated with the virulent isolates alone. Recovery of the different colony types of Phytophthora spp. from roots of sweet orange (C. sinensis) or Swingle citrumelo was evaluated on semiselective medium after sequential inoculations with the hypovirulent Pn117 and virulent Pp99. 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C." last="Colburn">G. C. Colburn</name></noRegion><name sortKey="Graham, J H" sort="Graham, J H" uniqKey="Graham J" first="J. H." last="Graham">J. H. Graham</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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