DUTECH, Christian Cyril; FABREGUETTES, Olivier; CAPDEVIELLE, Xavier; ROBIN, Cécile

doi:10.1038/hdy.2009.164

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

FABREGUETTES, Olivier
Biodiversité, Gènes & Communautés [BioGeCo]

CAPDEVIELLE, Xavier
Biodiversité, Gènes & Communautés [BioGeCo]

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Heredity. 2010, vol. 105, n° 2, p. 220-228

Nature Publishing Group

Résumé en anglais

The occurrence of multiple introductions may be a crucial factor in the successful establishment of invasive species, but few studies focus on the introduction of fungal pathogens, despite their significant effect on invaded habitats. Although Cryphonectria parasitica, the chestnut blight fungus introduced in North America and Europe from Asia during the 20th century, caused dramatic changes in its new range, the history of its introduction is not well retraced in Europe. Using 10 microsatellite loci, we investigated the genetic diversity of 583 isolates in France, where several introductions have been hypothesized. Our analyses showed that the seven most frequent multilocus genotypes belonged to three genetic lineages, which had a different and geographically limited distribution. These results suggest that different introduction events occurred in France. Genetic recombination was low among these lineages, despite the presence of the two mating types in each chestnut stand analysed. The spatial distribution of lineages suggests that the history of introductions in France associated with the slow expansion of the disease has contributed to the low observed rate of recombination among the divergent lineages. However, we discuss the possibility that environmental conditions or viral interactions could locally reduce recombination among genotypes.< Réduire

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ASCOMYCOTA

BIOLOGICAL INVASION

Mots clés en anglais

BAYESIAN CLUSTERING ANALYSIS

CRYPHONECTRIA-HYPOVIRUS

LINKAGE DISEQUILIBRIUM

PRINCIPAL COMPONENT ANALYSIS

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Multiple introductions of divergent genetic lineages in an invasive fungal pathogen, Cryphonectria parasitica, in France

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