Etude de la diversité génétique de la truffe blanche du Piémont (Tuber magnatum Pico) et de la truffe noire du Périgord (Tuber melanosporum Vittad.)

Abstract : Truffles are ectomycorrhizal fungi belonging to Tuber. Fructifications of some species, such as T. melanosporum and T. magnatum, are appreciated by consumers and have important economic value. Despite of numerous studies, some aspects of truffle biology (i.e. phylogeography and ecology) are unknown. Wide range analysis of genetic diversity in T. melanosporum showed important genetic differentiation between East and West French populations. Phylogeographic analysis allowed us to hypothesis that T. melanosporum recolonized France by two main routes : Rhône Valley route and Atlantic route. T. magnatum ascocarps analysis in a natural truffle ground identified at least two genotypes in this population. In order to characterize T. magnatum mycorrhizosphere, root tips have been harvested. We found that T. magnatum ectomycorrhizas are very rare (two out of 39 morphotypes). Moreover, more abundant species belong to Telephoraceae, Pezizales and Sebacina.
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Claude Murat-Furminieux. Etude de la diversité génétique de la truffe blanche du Piémont (Tuber magnatum Pico) et de la truffe noire du Périgord (Tuber melanosporum Vittad.). Sciences agricoles. Université Henri Poincaré - Nancy 1, 2004. Français. ⟨NNT : 2004NAN10189⟩. ⟨tel-01776054⟩

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