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Cindy Morris

The plant pathogenic and ice nucleation active bacterium Pseudomonas syringae, a link between agriculture and Earth system processes

Résumé :
The bacterium Pseudomonas syringae has been historically considered as an archetypical plant pathogen. The past decade of research on the ecology of this bacterium is leading to a new image, moving it away from “ubiquitous epiphytic plant pathogen” to “multifaceted bacterium sans frontiers” in fresh water and other ecosystems linked to the water cycle. Discovery of the aquatic facet of its ecology has led to a vision of its life history that integrates spatial and temporal scales spanning billions of years and traversing watersheds, continents and the planet, and that confronts the implication of roles that are potentially conflicting for agriculture – as a plant pathogen and as an actor in processes leading to rain and snowfall. This new ecological perspective has also yielded insight into epidemiological phenomena linked to disease emergence. Overall, it sets the stage for the integration of more comprehensive contexts of ecology and evolutionary history into comparative genomic analyses to elucidate how P. syringae subverts attack and defense responses of the cohabitants of the diverse environments it occupies. Furthermore, it illustrates how this organism might also play beneficial roles in major environmental processes such as rainfall.