Nonagricultural reservoirs contribute to emergence and evolution of <em>Pseudomonas syringae</em> crop pathogens - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Accéder directement au contenu
Article Dans Une Revue New Phytologist Année : 2013

Nonagricultural reservoirs contribute to emergence and evolution of Pseudomonas syringae crop pathogens

Résumé

While the existence of environmental reservoirs of human pathogens is well established, less is known about the role of nonagricultural environments in emergence, evolution, and spread of crop pathogens. Here, we analyzed phylogeny, virulence genes, host range, and aggressiveness of Pseudomonas syringae strains closely related to the tomato pathogen P. syringae pv. tomato (Pto), including strains isolated from snowpack and streams. The population of Pto relatives in nonagricultural environments was estimated to be large and its diversity to be higher than that of the population of Pto and its relatives on crops. Ancestors of environmental strains, Pto, and other genetically monomorphic crop pathogens were inferred to have frequently recombined, suggesting an epidemic population structure for P. syringae. Some environmental strains have repertoires of type III-secreted effectors very similar to Pto, are almost as aggressive on tomato as Pto, but have a wider host range than typical Pto strains. We conclude that crop pathogens may have evolved through a small number of evolutionary events from a population of less aggressive ancestors with a wider host range present in nonagricultural environments.

Dates et versions

hal-02648548 , version 1 (29-05-2020)

Identifiants

Citer

Caroline Monteil, Rongman Cai, Haijie Liu, Marco E. Mechan Llontop, Scotland Leman, et al.. Nonagricultural reservoirs contribute to emergence and evolution of Pseudomonas syringae crop pathogens. New Phytologist, 2013, 199 (3), pp.800 - 811. ⟨10.1111/nph.12316⟩. ⟨hal-02648548⟩
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