The LysM-RLKs of Medicago truncatula: role and use for the perception of symbiotic signals.

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Fliegmann, Judith | Gasciolli, Virginie | Cumener, Marie | Buendia Martin, Luis Fernando | Rosenberg, Charles | Malkov, Nikita | Gough, Clare | Lefebvre, Benoît | Cullimore, Julie Vera | Bono, Jean-Jacques

Edité par CCSD -

International audience. Nod factors are the bacterial determinants of infection, nodulation and host specificity in the legume-rhizobia symbiosis. How these compounds are perceived is still a challenging question in terms of basic knowledge and biotechnological purposes, since Nod factors are structurally-related to other signaling molecules, i.e Myc-LCOs and chitooligosaccharides (COs), which play important roles in mycorrhization or plant immunity. By using radiolabelled Nod factors, different classes of Nod factor-binding sites (NFBSs) have been characterised in Medicago spp. One of these binding sites, termed NFBS2, exhibits a high affinity for the major Nod factor produced by Sinorhizobium meliloti, the symbiont of Medicago truncatula. The binding protein, termed NFBP2, has been recently identified as a Lysin motif Receptor Like Kinase (LysM-RLK), differing from the two LysM-RLKs (NFP and LYK3), identified by genetic approaches as important for Nod factor responses and Rhizobial infection. NFBP2 recognizes Myc-LCOs as well as Nod factors with a high affinity, but not chitooligosaccharides. Our on-going work on NFBP2 and other M. truncatula LysM-RLKs aims to understand the molecular mechanisms of LCO recognition and to evaluate its potential for improving the rhizobial symbiosis and the plant response to LCOs.

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