Adaptation to the most abundant host genotype in an agricultural plant-pathogen system - potato late blight - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Journal of Evolutionary Biology Year : 2008

Adaptation to the most abundant host genotype in an agricultural plant-pathogen system - potato late blight

Abstract

This study investigated local adaptation of Phytophthora infestans populations, the causal agent of potato late blight, to two susceptible potato cultivars, each grown for a number of years and over large areas in separate French regions. We measured aggressiveness (quantitative pathogenicity) of each pathogen population to sympatric and allopatric hosts in a reciprocal cross-inoculation experiment. There was no evidence for specific host adaptation in this pathosystem. At both local and regional scales, the distribution of aggressiveness fits a pattern of adaptation to the most common host genotype. Our observations support the theoretical predictions that large pathogen dispersal rates and genetic drift, revealed by the comparisons of the genotypic structures of the populations tested, can lead to a local adaptation pattern detectable only at a large spatial scale. The unravelling of adaptive patterns at different spatial scales can be used for a more efficient management of the disease.

Dates and versions

hal-02655462 , version 1 (29-05-2020)

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Josselin Montarry, Isabelle Glais, Roselyne Corbière, Didier Andrivon. Adaptation to the most abundant host genotype in an agricultural plant-pathogen system - potato late blight. Journal of Evolutionary Biology, 2008, 21 (5), pp.1397-1407. ⟨10.1111/j.1420-9101.2008.01557.x⟩. ⟨hal-02655462⟩
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