These two authors contributed equally to this work
Nonagricultural reservoirs contribute to emergence and evolution of Pseudomonas syringae crop pathogens
Article first published online: 21 MAY 2013
© 2013 The Authors. New Phytologist © 2013 New Phytologist Trust
Volume 199, Issue 3, pages 800–811, August 2013
How to Cite
Monteil, C. L., Cai, R., Liu, H., Mechan Llontop, M. E., Leman, S., Studholme, D. J., Morris, C. E. and Vinatzer, B. A. (2013), Nonagricultural reservoirs contribute to emergence and evolution of Pseudomonas syringae crop pathogens. New Phytologist, 199: 800–811. doi: 10.1111/nph.12316
- Issue published online: 11 JUL 2013
- Article first published online: 21 MAY 2013
- Manuscript Accepted: 2 APR 2013
- Manuscript Received: 20 FEB 2013
- NSF. Grant Number: IOS 0746501
- host range;
- plant pathogens;
- water cycle
- 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.