M. Ongena - Featuring bacterial lipopeptides as mediators of Bacillus-plant-AMF interactions

Abstract

Amphiphilic cyclic lipopeptides represent a prominent category of bacterial specialized metabolites, best described for their strong antagonistic activity against phytopathogens. It is thus assumed that these compounds are mainly deployed by rhizosphere-dwelling bacilli as microbial weapons in competitive natural environments. Challenging this reductionist perspective, our recent works feature some of these Bacillus CLPs also as prominent chemical mediators of ecological interactions beyond chemical warefare. We showed that the surfactin CLP is used to interact with the host plant as immunity elicitor and to establish mutualistic relationships with other microorganisms including mycorrhiza. We will present some recent insights into the mechanistics underpinning these functions as well as the fitness benefits provided to each partner. The ultimate objective is to harness these insights for developing environmentally friendly pest management strategies.

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Marc Ongena est chercheur à l’UMR BioagroEco, où il développe des travaux sur les interactions plantes-microorganismes et les métabolites spécialisés bactériens. Ses recherches portent en particulier sur les lipopeptides cycliques de Bacillus et leur rôle dans la bioprotection, l’induction des défenses des plantes et les interactions mutualistes. Il s’intéresse à la valorisation de ces mécanismes naturels pour concevoir des approches innovantes en protection intégrée et en agriculture durable.

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