Séminaire IBIP – Série thématique « fruit and seed »
Les séminaires ont lieu sur le Campus Montpellier SupAgro/INRA de La Gaillarde (2, place P. Viala Montpellier)

Jeudi 26 mai 2016
Salle 104 (Château) à 14h

Perception by plants of symbiotic signals produced by arbuscular mycorrhizal fungi

Benoît Lefebvre
Laboratoire des Interactions Plantes Micro-organismes, LIPM-INRA, Castanet Tolosan

Arbuscular mycorrhizal (AM) fungi colonize roots of most land plants allowing them better access to nutrients. AM fungi secrete lipo-chitooligosaccharides (LCOs) and chitooligosaccharides (COs), called Myc-factors. LCOs, called Nod-factors are also produced by rhizobial bacteria, which form another root endosymbiosis with legume plants. In legumes, Myc-factors and Nod-factors activate the common symbiosis signaling pathway that is required for both the AM and the rhizobia/legume symbioses. Nod-factors are essential for establishment of nodulation. In contrast, the role of Myc-factors in the AM is not yet known, although they induce molecular and developmental responses on diverse plant species. We aim to better understand the roles of Myc-factors. To do this, we are searching for their receptors in plants. Proteins encoded by the Lysin-Motif Receptor-Like Kinase (LysM-RLK) family are candidates to be LCO and CO receptors. We are mainly using tomato, a dicotyledon and Brachypodium distachyon, a monocotyledon, for reverse genetics. We found that a LysM-RLK from each of these species has high affinity and selectivity for LCO structures. In addition, we have shown that in tomato, this LysM-RLK is involved in the establishment of the AM symbiosis.

Contact : Tou-Cheu Xiong

Contacts IBIP :
Sabine Zimmermann
Alexandre Martiniere
Christine Granier
Chantal Baracco