Evolution of the rice blast pathogen on spatially structured rice landraces maintains multiple generalist fungal lineages
2023
Ali, Sajid | Gladieux, Pierre | Ravel, Sebastien | Adreit, Henri | Meusnier, Isabelle | Milazzo, Joelle | Cros-Arteil, Sandrine | Bonnot, François | Jin, Baihui | Dumartinet, Thomas | Charriat, Florian | Lassagne, Alexandre | He, Xiahong | Tharreau, Didier | Huang, Huichuan | Morel, Jean Benoît | Fournier, Elisabeth | Hazara University Mansehra (HU) | Plant Health Institute of Montpellier (UMR PHIM) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université de Montpellier (UM) | Département Systèmes Biologiques (Cirad-BIOS) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad) | Kunming University | Yunnan Agricultural University | International Associate Laboratory (LIA) Plantomix | INRAE SMaCH Metaprogram
International audience
Mostrar más [+] Menos [-]Inglés. Traditional agrosystems, where humans, crops and microbes have coevolved over long periods, can serve as models to understand the ecoevolutionary determinants of disease dynamics and help the engineering of durably resistant agrosystems. Here, we investigated the genetic and phenotypic relationship between rice (Oryza sativa) landraces and their rice blast pathogen (Pyricularia oryzae) in the traditional Yuanyang terraces of flooded rice paddies in China, where rice landraces have been grown and bred over centuries without significant disease outbreaks. Analyses of genetic subdivision revealed that indica rice plants clustered according to landrace names. Three new diverse lineages of rice blast specific to the Yuanyang terraces coexisted with lineages previously detected at the worldwide scale. Population subdivision in the pathogen population did not mirror pattern of population subdivision in the host. Measuring the pathogenicity of rice blast isolates on landraces revealed generalist life history traits. Our results suggest that the implementation of disease control strategies based on the emergence or maintenance of a generalist lifestyle in pathogens may sustainably reduce the burden of disease in crops.
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