Habilitation à Diriger des Recherches

Jeudi 29 avril 2021 à 14h
(en visioconférence)
Campus de la Gaillarde

Exsudation racinaire, interaction avec le microbiote et nutrition minérale chez les blés sauvages et modernes

Jean-Benoît Peltier
BPMP, équipe Transport Ionique chez les Céréales et adaptation à l’EnviRonnement

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ID de réunion : 759 006 3096
Code secret : HDRjbP294!

Composition du jury :
Guillaume Bécard, Professeur, Université de Toulouse, Toulouse (Rapporteur),
Renaud Brouquisse, DR INRAE, Sofia AgroBiotech, Nice (Rapporteur),
Daniel Wipf, Professeur, Université de Dijon, Dijon (Rapporteur),
Philippe Normand, Professeur, Université de Lyon, Lyon (Examinateur),
Brigitte Brunel, Professeur SupAgro, Montpellier (Présidente du Jury)



The general framework of my research project is the analysis of the interactions between the plant root system and its microbiota. This project reflects a progressive thematic mobility, from biochemical and molecular levels to more integrative approaches. After academic studies in biochemistry, genetics and plant physiology, I became interested during my thesis in the analysis of the sensitivity of the plasma membrane H+-ATPase to auxin. This project led me to participate to the elaboration of one of the first protein repertoire of the plasma membrane. I then joined KJ van Wijk’s team as a post-doctoral fellow at Stockholm University and then at Cornell University (USA) to study the biogenesis of thylakoids and to focus on the structure of a soluble and membrane associated ClpP protease complex. In 2005, I was recruited at INRAE in the Functional Proteomics Laboratory (LPF); where I developed a project on the role of post-translational modifications (nitrosylation and Ub and SUMO labeling) in cell signaling in response to iron stress. In 2012, I carried out a thematic mobility by joining the Ionic Channels team of the UMR Biochimie et Physiologie Moléculaire des Plantes (BPMP), to focus on the structure-function relationship of K+ and/or Na+ membrane transport systems belonging to the HKT family in cereals. These systems strongly contribute to the control of K+ and Na+ homeostasis in the aerial parts of the plant, and thus play a major role in the tolerance to soil salinity. In parallel and progressively, with the desire to engage myself in more integrated analyses, taking into account not only the whole plant but also its holobiont, I have set up, with two PhD students that I supervise, a project aiming at analyzing the impact of the rhizosphere microbiota on root functions in wheat. I am particularly interested in the microbiota of a wheat ancestor, as well as in the impact of bacteria on the development of root hairs, and in the function of root exudation as a communication process with rhizospheric microbes, by implementing metabolomic and proteomic analyses of exuded compounds.