Bacterial-fungal interactions in wood decay: from wood physicochemical properties to taxonomic and functional diversity of Phanerochaete chrysosporium-associated bacterial communities

Abstract : Wood decomposition is an important process in forest ecosystems in terms of their carbon and nutrient cycles. In temperate forests, saprotrophic basidiomycetes such as white-rot fungi are the main wood decomposers. While they have been less studied, bacterial communities also colonise decaying wood and coexist with these fungal communities. Although the impact of bacterial-fungal interactions on niche functioning has been highlighted in a wide range of environments, little is known about their role in wood decay. Based on microcosm experiments and using a culture-independent approach, we showed that the presence of the white-rot fungus Phanerochaete chrysosporium significantly modified the structure and diversity of the bacterial communities associated with the degradation of beech wood (Fagus sylvatica). Using a culture-dependent approach, it was confirmed that in the presence of the fungus the mycosphere effect resulted in increased bacterial abundance and modified the functional diversity of the fungal-associated bacterial communities. Lastly, a polyphasic approach simultaneously analysing wood physicochemical properties and extracellular enzyme activities was developed. This approach revealed that P. chrysosporium associated with a bacterial community isolated from its mycosphere was more efficient in degrading wood compared to the fungus on its own, highlighting for the first time synergistic bacterial-fungal interactions in decaying wood
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Vincent Hervé. Bacterial-fungal interactions in wood decay: from wood physicochemical properties to taxonomic and functional diversity of Phanerochaete chrysosporium-associated bacterial communities. Agricultural sciences. Université de Lorraine, 2014. English. ⟨NNT : 2014LORR0041⟩. ⟨tel-01750743⟩

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