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Dominance of natural over released biological control agents of the chestnut blight fungus Cryphonectria parasitica in south-eastern France is associated with fitness-related traits

hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorROBIN, Cécile
hal.structure.identifierSwiss Federal Institute for Forest, Snow and Landscape Research WSL
dc.contributor.authorLANZ, Stefan
hal.structure.identifiergroupement de Grenoble
dc.contributor.authorSOUTRENON, Alain
hal.structure.identifierSwiss Federal Institute for Forest, Snow and Landscape Research WSL
dc.contributor.authorRIGLING, Daniel
dc.date.accessioned2022-10-12T12:44:01Z
dc.date.available2022-10-12T12:44:01Z
dc.date.issued2010
dc.identifier.issn1049-9644
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/157156
dc.description.abstractEnCryphonectria hypovirus 1 (CHV-1) is responsible for hypovirulence (reduced virulence) in the chestnut blight fungus Cryphonectria parasitica and has been used as a biocontrol agent against this introduced tree pathogen. However, the development of self-sustaining hypovirulence following the deployment of virus strains has never clearly been demonstrated. We assessed the prevalence of subtypes of CHV-1 in south-eastern France, where a specific CHV-1 subtype (F1) has been released for biological control at several chestnut sites. Using these data, we explored the potential effects of control treatments, fungal vegetative incompatibility and the ecological fitness of viral subtypes on the establishment of CHV-1 in C. parasitica populations. The prevalence of CHV-1 in C. parasitica cankers varied from 31 to 90% between sites and was not related to biological control treatment or to the diversity of vegetative compatibility types of the fungal population. Our study revealed that the CHV-1 subtype F1 used for biological control did not become established in the study area. Of the 79 hypoviruses identified, 78 belonged to CHV-1 subtype I, and one to subtype F2. Fungal isolates infected with CHV-1 subtypes F1 or F2 grew significantly slower and had lower levels of sporulation than isolates infected with the naturally occurring subtype I viruses. The greater ecological fitness of subtype I than of subtypes F1 and F2 probably accounts for its greater invasiveness. Our results indicate that different CHV-1 subtypes could be used differently in the biological control of chestnut blight.
dc.language.isoen
dc.publisherElsevier
dc.subjectCONTRÔLE BIOLOGIQUE
dc.subject.enCRYPHONECTRIA PARASITICA
dc.subject.enCRYPHONECTRIA HYPOVIRUS
dc.subject.enCLASSICAL BIOLOGICAL CONTROL
dc.subject.enCHESTNUT BLIGHT DISEASE
dc.subject.enVEGETATIVE COMPATIBILITY
dc.title.enDominance of natural over released biological control agents of the chestnut blight fungus Cryphonectria parasitica in south-eastern France is associated with fitness-related traits
dc.typeArticle de revue
dc.identifier.doi10.1016/j.biocontrol.2009.10.013
dc.subject.halSciences du Vivant [q-bio]/Biotechnologies
bordeaux.journalBiological Control
bordeaux.page55-61
bordeaux.volume53
bordeaux.hal.laboratoriesBioGeCo (Biodiversité Gènes & Communautés) - UMR 1202*
bordeaux.issue1
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-02665216
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02665216v1
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