Tracking costs of virulence in natural populations of the wheat pathogen, Puccinia striiformis f.sp.tritici
Identifieur interne : 000326 ( Pmc/Curation ); précédent : 000325; suivant : 000327Tracking costs of virulence in natural populations of the wheat pathogen, Puccinia striiformis f.sp.tritici
Auteurs : Bochra Bahri [France] ; Oliver Kaltz [France] ; Marc Leconte [France] ; Claude De Vallavieille-Pope [France] ; Jérôme Enjalbert [France]Source :
- BMC Evolutionary Biology [ 1471-2148 ] ; 2009.
Abstract
Costs of adaptation play an important role in host-parasite coevolution. For parasites, evolving the ability to circumvent host resistance may trade off with subsequent growth or transmission. Such costs of virulence (
In pairwise competition experiments, we compared the fitness of near-isogenic genotypes that differed by a single virulence factor. Two virulence factors (
Our results illustrate the variation in the evolutionary trajectories of virulence mutations and the potential role of compensatory mutations. Anticipation of such variable evolutionary outcomes represents a major challenge for plant breeding strategies. More generally, we believe that agro-patho-systems can provide valuable insight in (co)evolutionary processes in host-parasite systems.
Url:
DOI: 10.1186/1471-2148-9-26
PubMed: 19183485
PubMed Central: 2660305
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f.sp.<italic>tritici</italic>
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f.sp.<italic>tritici</italic>
</title>
<author><name sortKey="Bahri, Bochra" sort="Bahri, Bochra" uniqKey="Bahri B" first="Bochra" last="Bahri">Bochra Bahri</name>
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<author><name sortKey="Kaltz, Oliver" sort="Kaltz, Oliver" uniqKey="Kaltz O" first="Oliver" last="Kaltz">Oliver Kaltz</name>
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<affiliation wicri:level="1"><nlm:aff id="I3">Institut des Sciences de l'Evolution – UMR 5554, Université Montpellier 2, Place E. Bataillon (CC065), 34095 Montpellier Cedex 05, France</nlm:aff>
<country xml:lang="fr">France</country>
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<author><name sortKey="Leconte, Marc" sort="Leconte, Marc" uniqKey="Leconte M" first="Marc" last="Leconte">Marc Leconte</name>
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<wicri:regionArea>UMR BIOGER CPP, INRA Agro-Paris-Tech, BP01, 78850 Thiverval-Grignon</wicri:regionArea>
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<author><name sortKey="De Vallavieille Pope, Claude" sort="De Vallavieille Pope, Claude" uniqKey="De Vallavieille Pope C" first="Claude" last="De Vallavieille-Pope">Claude De Vallavieille-Pope</name>
<affiliation wicri:level="1"><nlm:aff id="I1">UMR BIOGER CPP, INRA Agro-Paris-Tech, BP01, 78850 Thiverval-Grignon, France</nlm:aff>
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<author><name sortKey="Enjalbert, Jerome" sort="Enjalbert, Jerome" uniqKey="Enjalbert J" first="Jérôme" last="Enjalbert">Jérôme Enjalbert</name>
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<front><div type="abstract" xml:lang="en"><sec><title>Background</title>
<p>Costs of adaptation play an important role in host-parasite coevolution. For parasites, evolving the ability to circumvent host resistance may trade off with subsequent growth or transmission. Such costs of virulence (<italic>sensu </italic>
plant pathology) limit the spread of all-infectious genotypes and thus facilitate the maintenance of genetic polymorphism in both host and parasite. We investigated costs of three virulence factors in <italic>Puccinia striiformis </italic>
f.sp.<italic>tritici</italic>
, a fungal pathogen of wheat (<italic>Triticum aestivum</italic>
).</p>
</sec>
<sec><title>Results</title>
<p>In pairwise competition experiments, we compared the fitness of near-isogenic genotypes that differed by a single virulence factor. Two virulence factors (<italic>vir4</italic>
, <italic>vir6</italic>
) imposed substantial fitness costs in the absence of the corresponding resistance genes. In contrast, the <italic>vir9 </italic>
virulence factor conferred a strong competitive advantage to several isolates, and this for different host cultivars and growing seasons. In part, the experimentally derived fitness costs and benefits are consistent with frequency changes of these virulence factors in the French pathogen population.</p>
</sec>
<sec><title>Conclusion</title>
<p>Our results illustrate the variation in the evolutionary trajectories of virulence mutations and the potential role of compensatory mutations. Anticipation of such variable evolutionary outcomes represents a major challenge for plant breeding strategies. More generally, we believe that agro-patho-systems can provide valuable insight in (co)evolutionary processes in host-parasite systems.</p>
</sec>
</div>
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<pmc article-type="research-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">BMC Evol Biol</journal-id>
<journal-title>BMC Evolutionary Biology</journal-title>
<issn pub-type="epub">1471-2148</issn>
<publisher><publisher-name>BioMed Central</publisher-name>
</publisher>
</journal-meta>
<article-meta><article-id pub-id-type="pmid">19183485</article-id>
<article-id pub-id-type="pmc">2660305</article-id>
<article-id pub-id-type="publisher-id">1471-2148-9-26</article-id>
<article-id pub-id-type="doi">10.1186/1471-2148-9-26</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject>
</subj-group>
</article-categories>
<title-group><article-title>Tracking costs of virulence in natural populations of the wheat pathogen, <italic>Puccinia striiformis </italic>
f.sp.<italic>tritici</italic>
</article-title>
</title-group>
<contrib-group><contrib id="A1" corresp="yes" contrib-type="author"><name><surname>Bahri</surname>
<given-names>Bochra</given-names>
</name>
<xref ref-type="aff" rid="I1">1</xref>
<email>bochra.bahri@grignon.inra.fr</email>
</contrib>
<contrib id="A2" contrib-type="author"><name><surname>Kaltz</surname>
<given-names>Oliver</given-names>
</name>
<xref ref-type="aff" rid="I2">2</xref>
<xref ref-type="aff" rid="I3">3</xref>
<email>oliver.kaltz@univ-montp2.fr</email>
</contrib>
<contrib id="A3" contrib-type="author"><name><surname>Leconte</surname>
<given-names>Marc</given-names>
</name>
<xref ref-type="aff" rid="I1">1</xref>
<email>leconte@grignon.inra.fr</email>
</contrib>
<contrib id="A4" contrib-type="author"><name><surname>de Vallavieille-Pope</surname>
<given-names>Claude</given-names>
</name>
<xref ref-type="aff" rid="I1">1</xref>
<email>pope@grignon.inra.fr</email>
</contrib>
<contrib id="A5" contrib-type="author"><name><surname>Enjalbert</surname>
<given-names>Jérôme</given-names>
</name>
<xref ref-type="aff" rid="I1">1</xref>
<email>enjalber@grignon.inra.fr</email>
</contrib>
</contrib-group>
<aff id="I1"><label>1</label>
UMR BIOGER CPP, INRA Agro-Paris-Tech, BP01, 78850 Thiverval-Grignon, France</aff>
<aff id="I2"><label>2</label>
UPMC UnivParis 06, Laboratoire de Parasitologie Evolutive – UMR 7103, 7 quai St-Bernard, 75252 Paris, France</aff>
<aff id="I3"><label>3</label>
Institut des Sciences de l'Evolution – UMR 5554, Université Montpellier 2, Place E. Bataillon (CC065), 34095 Montpellier Cedex 05, France</aff>
<pub-date pub-type="collection"><year>2009</year>
</pub-date>
<pub-date pub-type="epub"><day>30</day>
<month>1</month>
<year>2009</year>
</pub-date>
<volume>9</volume>
<fpage>26</fpage>
<lpage>26</lpage>
<ext-link ext-link-type="uri" xlink:href="http://www.biomedcentral.com/1471-2148/9/26"></ext-link>
<history><date date-type="received"><day>22</day>
<month>8</month>
<year>2008</year>
</date>
<date date-type="accepted"><day>30</day>
<month>1</month>
<year>2009</year>
</date>
</history>
<permissions><copyright-statement>Copyright © 2009 Bahri et al; licensee BioMed Central Ltd.</copyright-statement>
<copyright-year>2009</copyright-year>
<copyright-holder>Bahri et al; licensee BioMed Central Ltd.</copyright-holder>
<license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/2.0"><p>This is an Open Access article distributed under the terms of the Creative Commons Attribution License (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/2.0"></ext-link>
), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</p>
<pmc-comment>
Bahri
Bochra
bochra.bahri@grignon.inra.fr
Tracking costs of virulence in natural populations of the wheat pathogen, Puccinia striiformis f.sp.tritici
2009 BMC Evolutionary Biology 9(1): 26-. (2009) 1471-2148(2009)9:1<26> urn:ISSN:1471-2148 </pmc-comment>
</license>
</permissions>
<abstract><sec><title>Background</title>
<p>Costs of adaptation play an important role in host-parasite coevolution. For parasites, evolving the ability to circumvent host resistance may trade off with subsequent growth or transmission. Such costs of virulence (<italic>sensu </italic>
plant pathology) limit the spread of all-infectious genotypes and thus facilitate the maintenance of genetic polymorphism in both host and parasite. We investigated costs of three virulence factors in <italic>Puccinia striiformis </italic>
f.sp.<italic>tritici</italic>
, a fungal pathogen of wheat (<italic>Triticum aestivum</italic>
).</p>
</sec>
<sec><title>Results</title>
<p>In pairwise competition experiments, we compared the fitness of near-isogenic genotypes that differed by a single virulence factor. Two virulence factors (<italic>vir4</italic>
, <italic>vir6</italic>
) imposed substantial fitness costs in the absence of the corresponding resistance genes. In contrast, the <italic>vir9 </italic>
virulence factor conferred a strong competitive advantage to several isolates, and this for different host cultivars and growing seasons. In part, the experimentally derived fitness costs and benefits are consistent with frequency changes of these virulence factors in the French pathogen population.</p>
</sec>
<sec><title>Conclusion</title>
<p>Our results illustrate the variation in the evolutionary trajectories of virulence mutations and the potential role of compensatory mutations. Anticipation of such variable evolutionary outcomes represents a major challenge for plant breeding strategies. More generally, we believe that agro-patho-systems can provide valuable insight in (co)evolutionary processes in host-parasite systems.</p>
</sec>
</abstract>
</article-meta>
</front>
</pmc>
</record>
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