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Communication Dans Un Congrès Année : 2019

Investigation of the regulation of ectomycorrhizal symbiosis by nutrient signalling in Poplar

Résumé

To improve their mineral nutrition, trees form symbiotic associations with mutualistic microorganisms. 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 their symbiotic associations. In Legumes, Small-Secreted Peptides (SSP) mediate local and systemic signals regulating nutrient stress responses including symbiotic interactions with nitrogen fixing bacteria. Occurring between 6000 trees species and several fungi of the Basidiomycota and Ascomycota phyla, ectomycorrhizal (ECM) symbioses are pivotal for nutrient cycling in forests. However, little is known regarding the molecular and physiological mechanisms controlling ECM- associations. Members of several SSP families were found in the model tree Populus. 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 Populus canescens 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 secretomics.
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Dates et versions

hal-04186913 , version 1 (24-08-2023)

Identifiants

  • HAL Id : hal-04186913 , version 1

Citer

C. Bonnot, Alexandra Hénocq, Cécile Gaumétou, Emmanuelle Morin, Annegret Kohler, et al.. Investigation of the regulation of ectomycorrhizal symbiosis by nutrient signalling in Poplar. 4th international Molecular Mycorrhiza Meeting, Feb 2019, Turin, Italy. ⟨hal-04186913⟩
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