séminaire Agroécologie

"Écologie microbienne et fonctionnement des écosystèmes: déclinaisons autour des communautés impliquées dans le cycle de l'azote" - Laurent Philippot, UMR MSE, Inra Dijon - lundi 15 Novembre 2010 à 11h, salle de conférences Inra





The denitrification trait is a microbial respiratory process during which soluble nitrogen oxides are used as alternative electron acceptor when oxygen is limiting. It results in considerable losses of nitrogen, which is the most limiting nutrient for crop production in agriculture. Denitrification is also of environmental concern, since it is the main biological process responsible for emissions of nitrous oxide, one of the six greenhouse gases considered by the Kyoto protocol. In addition to natural variations, agroecosystems are characterized by the use of numerous practices, such as fertilization and tillage, which influence N-fluxes by denitrification. This has been widely documented in the literature, mirroring the complexity of the underlying mechanisms regulating this process. In the last decade, however, application of molecular biology approaches has given the opportunity to look behind denitrification rates and study the ecology of the micro-organisms involved in this process, the denitrifying community.  This talk will give examples of the use of the denitrifiers as a model guild for bridging microbial community ecology, microbial processes and ecosystem functioning.

Laurent PHILIPPOT, Directeur de Recherche
UMR Microbiologie du sol et de l’environnement
INRA Dijon
[page web]