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Communication Dans Un Congrès Année : 2018

Investigation of the regulation of ECM symbiosis by nutrient signalling in plants

Résumé

To improve their mineral nutrition, plants form symbiotic associations with mutualistic microorganisms such as nitrogen fixing bacteria and mycorrhizal fungi. Symbiotic associations are mutually beneficial interactions in which the microorganism provides the plant with mineral nutrients in exchange for organic carbon. Therefore, these associations have an energetic cost for the plant. This suggests that to maintain an optimal growth and invest their resources efficiently, plants have to perceive and integrate environmental and metabolic nutritional cues to regulate adequately the formation and maintenance of symbiotic associations (Bundrett, 2009; Garcia et al., 2015; Nehls et al., 2016; Nouri et al., 2014). In Legumes (e.g., Medicago), the secretion and translocation throughout the plant of Small-Secreted Proteins (SSP) mediates local and systemic signals regulating nutrient stress responses including symbiotic interactions with nitrogen fixing bacteria (de Bang et al., 2017; Bisseling and Scheres, 2014). Occurring between 6000 trees species and several fungi of the Basidiomycota and Ascomycota phyla, ectomyccorrhizal (ECM) symbioses are pivotal for nutrient cycling in forests (Martin et al., 2016). However, very little is known regarding the molecular and physiological mechanisms controlling these associations. Members of two plant SSP families have been found in the model tree Populus (Han et al., 2016; Ogilvie et al., 2014). To investigate whether and how the formation and maintenance of ECM associations are under the control of trees nutrient signals and SSPs we propose to (i) characterize the effects of different 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. These results should improve our knowledge about the signalling pathways regulating interactions between trees and microorganisms. This will also produce data regarding the impact of changes in forest soil nutrients content on the exploration and exploitation of the forest soil by trees in association with ECM fungi in forest affected by human activities and pollution.
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Dates et versions

hal-04186927 , version 1 (24-08-2023)

Identifiants

  • HAL Id : hal-04186927 , version 1

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C. Bonnot, Alexandra Hénocq, Cécile Gaumétou, Emmanuelle Morin, Annegret Kohler, et al.. Investigation of the regulation of ECM symbiosis by nutrient signalling in plants. VI WORKSHOP PLANT PEPTIDES AND RECEPTORS, Sep 2018, Antequera, Spain. ⟨hal-04186927⟩
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