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Evaluation et compréhension des mécanismes fongiques impliqués dans la dégradation du bois

Abstract : The study of enzymatic activities expressed during growth of the white rot fungus T. versicolor on malt agar medium in the presence of beech (Fagus sylvatica) wood chips was investigated. The process of wood degradation was divided in two stages. The first stage was characterized by the production of laccases and peroxidases activities. The second stage was characterized by production of carbohydrates hydrolyzing activities. At the beginning of wood colonization process, the production of laccases activities was correlated with degradation of wood acetonic extractives as catechin, which was easily identified in the beech extracts. The presence of a biocide like propiconazole is responsible of the induction of a strong chitinases activity at the beginning of the colonization process. Utilisation of caffeine, a chitinases inhibitor, in the presence of propiconazole allowed to reduce the quantity of biocide necessary to prevent wood from fungal degradation. Similarly, congo red, another cell wall perturbing agent, presented additive effect on inhibition of the fungal growth when associated to propiconazole. The application of the methods developed in this study to the case of heat treated beech wood highlighted the effect of this treatment on the expression of enzymatic activities during wood degradation process explaining in great part the improvement of durability observed after heat treatment.
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  • HAL Id : tel-01748530, version 1
  • PRODINRA : 277445

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Serge-Thierry Lekounoungou. Evaluation et compréhension des mécanismes fongiques impliqués dans la dégradation du bois. Autre. Université Henri Poincaré - Nancy 1, 2008. Français. ⟨NNT : 2008NAN10027⟩. ⟨tel-01748530⟩

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