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Etude de quelques fonctions clés de la physiologie des symbioses ectomycorhiziennes

Abstract : The first purpose of my work was to compare gene expression between the fungal compartment in close contact with the root and the extramatrical mycelium of the Paxillus involtus/Betula pendula symbiotic association. A gene coding a urea transporter, up-regulated in the extramatrical mycelium, and genes coding a phosphatidylserine decarboxylase and a protein of unknown function were cloned and characterized further. The second part of my work dealt with the mechanisms involved in the adaptation of ectomycorrhizal fungi to external nitrogen conditions. Studies concerned ammonium and peptide transport, and ammonium assimilating pathways. Moreover, we tried to determine the potential factors explaining the interspecific diversity observed among ectomycorrhizal fungi concerning nitrogen assimilation pathways, by coupling both biochemical and molecular approaches.
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Mélanie Morel. Etude de quelques fonctions clés de la physiologie des symbioses ectomycorhiziennes. Sylviculture, foresterie. Université Henri Poincaré - Nancy 1, 2005. Français. ⟨NNT : 2005NAN10120⟩. ⟨tel-01748084⟩

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