Skip to Main content Skip to Navigation
Journal articles

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

Abstract : 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.
Complete list of metadata

https://hal.inrae.fr/hal-02648548
Contributor : Migration Prodinra <>
Submitted on : Friday, May 29, 2020 - 9:50:39 AM
Last modification on : Thursday, February 25, 2021 - 10:44:04 AM

Links full text

Identifiers

Collections

Citation

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, Wiley, 2013, 199 (3), pp.800 - 811. ⟨10.1111/nph.12316⟩. ⟨hal-02648548⟩

Share

Metrics

Record views

312