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Écologie de Pseudomonas syringae dans un bassin versant : vers un modèle de transfert : des habitats naturels aux agro-systèmes

Abstract : The characterization of the spread of bio-agressors spread is a major issue for themanagement of plant health and the prediction of disease emergence. Given thelimitations of conventional approaches in plant pathology, a new vision has beenproposed addressing paradigms life history of plant pathogens outside the limits of thecrop host-pathogen system. Among the plant pathogens, studies on P. syringae are thosethat have contributed the most to this new way of thought for which life history inrelation to "non host" reservoirs has been highlighted. The species is found in manycompartments of the water cycle, from precipitation to rivers and irrigation water, wildplants and snowpack. All these observations have raised new questions about how P.syringae spreads through these environments and on the processes impactingpopulation dynamics at the scale of a watershed. This research was therefore interestedin these processes with the objective to acquire data for modeling the tranfer of P.syringae through the watershed. They highlighted the resident populations of litter andtheir survival in the soil, processes never identified in association with the life history ofP. syringae. They also revealed (i) the conditions for transport via precipitations, (ii) therole of snowpack as a reservoir and protector of the populations in alpine meadows and(iii) showed that water chemistry can be used as an indicator of the populationdynamics in headwaters. These observations suggested a transport of P. syringae via thesoil that we subsequently characterized through field studies and laboratorysimulations. Finally, all data from this research combined with GIS tools andmeteorological and hydrological models have permitted us to propose a model of theflux of P. syringae of natural habitats to agricultural systems.
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Submitted on : Tuesday, December 10, 2013 - 2:38:33 PM
Last modification on : Friday, November 5, 2021 - 2:16:01 PM
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  • HAL Id : tel-00916593, version 1
  • PRODINRA : 165142



Caroline Monteil. Écologie de Pseudomonas syringae dans un bassin versant : vers un modèle de transfert : des habitats naturels aux agro-systèmes. Sciences de la Terre. Université d'Avignon, 2011. Français. ⟨NNT : 2011AVIG0046⟩. ⟨tel-00916593⟩



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