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Le champignon ectomycorhizien Cenococcum geophilum Fr. dans les hêtraies lorraines : structure génétique des populations et rôle dans la résistance à la sécheresse des racines superficielles du hêtre

Abstract : The asexual ascomycete Cenococcum geophilum, known for its drought resistance, is a prominent fungus within the ectomycorrhizal comunities in the beech forests in northeastern France. A high level of genetic diversity between- and within- C. geophilum populations was observed. This result suggests the occurrence of a high rate of mitotic or meiotic recombinations and an effect of stand features on population structure. We compared respiration activities of C. geophilum and Lactarius-type ectomycorrhizas sampled from beech stands, during two growing seasons. When soil water potential is lower than -0.2 MPa, the respiration activity of C. geophilum ectomycorrhizas is significantly less altered than that of Lactarius-type ectomycorrhizas. Therefore, C. geophilum preserves the physiological integrity of beech root facing drought stress. In vitro tests did not reveal any metabolic effects which could explain the drought resistance of C. geophilum. In addition, no links between C. geophilum genotype and in vitro physiological behaviour were detected.
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Jean-Luc Jany. Le champignon ectomycorhizien Cenococcum geophilum Fr. dans les hêtraies lorraines : structure génétique des populations et rôle dans la résistance à la sécheresse des racines superficielles du hêtre. Biologie végétale. Université Henri Poincaré - Nancy 1, 2002. Français. ⟨NNT : 2002NAN10006⟩. ⟨tel-01754415⟩

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