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Emergence of new virulent populations of apple scab from nonagricultural disease reservoirs

hal.structure.identifierInstitut de Recherche en Horticulture et Semences [IRHS]
dc.contributor.authorLEMAIRE, Christophe
hal.structure.identifierInstitut de Recherche en Horticulture et Semences [IRHS]
dc.contributor.authorDE GRACIA, Marie
hal.structure.identifierInstitut de Recherche en Horticulture et Semences [IRHS]
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorLEROY, Thibault
hal.structure.identifierInstitute of Horticulture
dc.contributor.authorMICHALECKA, Monika
hal.structure.identifierAarhus University [Aarhus]
dc.contributor.authorLINDHARD-PEDERSEN, Hanne
hal.structure.identifierPeuplements végétaux et bioagresseurs en milieu tropical [UMR PVBMT]
hal.structure.identifierInstitut de Recherche en Horticulture et Semences [IRHS]
dc.contributor.authorGUÉRIN, Fabien
hal.structure.identifierBiologie et Génétique des Interactions Plante-Parasite [UMR BGPI]
hal.structure.identifierInstitut de Recherche en Horticulture et Semences [IRHS]
dc.contributor.authorGLADIEUX, Pierre
hal.structure.identifierInstitut de Recherche en Horticulture et Semences [IRHS]
dc.contributor.authorLE CAM, Bruno
dc.date.issued2015
dc.identifier.issn0028-646X
dc.description.abstractEnPlant pathogens adapt readily to new crop varieties in agrosystems, and it is crucial to understand the factors underlying the epidemic spread of new virulent strains if we are to develop more efficient strategies to control them. In this study we used multilocus microsatellite typing, molecular epidemiology tools and a large collection of isolates from cultivated, wild and ornamental apples to investigate the origin of new virulent populations of Venturia inaequalis, an ascomycete fungus causing apple scab on varieties carrying the Rvi6 resistance gene. We demonstrated a common origin at the European scale of populations infecting apples (Malus × domestica) carrying the Rvi6 resistance and Malus floribunda, the progenitor of the Rvi6 resistance. Demographic modeling indicated that the Rvi6-virulent lineage separated several thousands of years ago from populations infecting non-Rvi6 hosts, without detectable gene flow between the two lineages. These findings show that 'breakdowns' of plant resistance genes can be caused by the selection and migration of virulent genotypes from standing genetic variation maintained in environmental disease reservoirs, here ornamental crabapples. This work stresses the need to take better account of pathogen diversity in resistance screenings of breeding lines and in resistance deployment strategies, in order to enhance sustainable disease management.
dc.language.isoen
dc.publisherWiley
dc.subject.enVenturia inaequalis.
dc.subject.enMicrosatellites
dc.subject.enapproximate Bayesian computation
dc.subject.enenvironmental reservoirs
dc.subject.enevolutionary epidemiology
dc.subject.enMalus x domestica
dc.title.enEmergence of new virulent populations of apple scab from nonagricultural disease reservoirs
dc.typeArticle de revue
dc.identifier.doi10.1111/nph.13658
dc.subject.halSciences du Vivant [q-bio]
bordeaux.journalNew Phytologist
bordeaux.page1220–1229
bordeaux.volume209
bordeaux.issue3
bordeaux.peerReviewedoui
hal.identifierhal-01392705
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01392705v1
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