Regulation of ectomycorrhizal symbiosis by nutrient signalling in poplar
Résumé
To improve their mineral nutrition, trees form symbiotic associations with mutualistic microorganisms such as ectomycorrhizal (ECM) fungi 1. Symbiotic associations are mutually beneficial interactions in which the microorganism provides the plant with mineral nutrients in exchange for organic carbon. These associations have an energetic cost for the plant. Therefore, to maintain an optimal growth, plants have to integrate environmental and metabolic nutritional cues to regulate adequately the formation and maintenance of symbiotic associations 2. Little is known regarding the mechanisms controlling ECM-associations 3. In Legumes, Small-Secreted Peptides (SSP) mediate local and systemic signals regulating nutrient stress responses including symbiotic interactions with nitrogen fixing bacteria 4,5.
Members of several plant SSP families were found in the model tree Populus 6,7. To investigate whether and how trees nutrient signals and SSPs control the formation and maintenance of ECM associations, we propose to (i) characterize the effects of nutrient stresses on ECM symbiosis in the model tree Populus associated to the ECM fungus Laccaria bicolor, (ii) to identify the members of SSPs families in Populus by genome scan and phylogenetic analysis and (iii) to assess their role in the transduction of nutrient signals regulating Populus-Laccaria ECM by transcriptomics and secretomic.
Domaines
Sciences du Vivant [q-bio]
Origine : Fichiers produits par l'(les) auteur(s)
Licence : Domaine public
Licence : Domaine public