Évolution et adaptation des champignons saprophytes : les systèmes impliqués dans la dégradation du bois chez Trametes versicolor

Abstract : Wood is one of the most abundant polymer resources of the Earth’s ecosystem. Wood decaying fungi play an important role in the carbon cycle. They have a strong interest in biotechnology level in particular for the production of enzymes. Among the saprophytic fungi, those of the class of agaricomycota are particularly studied since they possess the ability to degrade varous compounds from wood : cellulose, hemicelluloses dand lignin. In addition, these fungi have developed a detoxification system involving enzymes such as glutathione transferases (GST). These latter are involved in degradation of wood but also in the degradation of xenobiotics. In this manuscript, the study of extracellular and intracellular system from Trametes versicolor, involved in wood decay process is described, the main goal being to identify the molecular factors involved in adaptation of the to their environment. Multidisciplinary approaches used in this PhD led to identification of an intraspecific phenotypic variability among ten strains of T. versicolor, this variability appearing to be related to the tree species where these strains have been isolated. Moreover, the work done on GSTs belonging to GHR and omega classes have improved our knowledge of the involvement of this gene family in adaptating the wood decayers to thrit lifestyle
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Aurélie Deroy. Évolution et adaptation des champignons saprophytes : les systèmes impliqués dans la dégradation du bois chez Trametes versicolor. Sciences agricoles. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0169⟩. ⟨tel-01752091⟩

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