DUTECH, Christian Cyril; BARRES, Benoît; BRIDIER, J.; ROBIN, Cécile; MILGROOM, M.G.; RAVIGNÉS, V.

doi:10.1111/j.1365-294X.2012.05575.x

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DUTECH, Christian Cyril
Biodiversité, Gènes & Communautés [BioGeCo]

BARRES, Benoît
Biodiversité, Gènes & Communautés [BioGeCo]

BRIDIER, J.
Institut National de la Recherche Agronomique [INRA]

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Ce document a été publié dans

Molecular Ecology. 2012, vol. 21, n° 16, p. 3931-3946

Wiley

Résumé en anglais

Clonal expansion has been observed in several invasive fungal plant pathogens colonizing new areas, raising the question of the origin of clonal lineages. Using microsatellite markers, we retraced the evolutionary history of introduction of the chestnut blight fungus, Cryphonectria parasitica, in North America and western Europe. Combining discriminant analysis of principal components and approximate Bayesian computation analysis, we showed that several introduction events from genetically differentiated source populations have occurred in both invaded areas. In addition, a low signal of genetic recombination among different source populations was suggested in North America. Finally, two genetic lineages were present in both invaded areas as well as in the native areas, suggesting the existence of genetic lineages with a high capacity to establish in diverse environments and host species. This study confirmed the importance of multiple introductions, but questioned the role of genetic admixture in the success of introduction of a fungal plant pathogen.< Réduire

Mots clés

biological invasion

genetic admixture

Mots clés en anglais

approximate Bayesian computation analysis

Cryphonectria parasitica

mode of reproduction

multiple introductions