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Organic acids production by white rot Basidiomycetes in the presence of metallic oxides

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The purpose of the present work was to determine if selected fungal strains belonging to wood-rotting Basidiomycetes are able to grow on and to solubilize different insoluble oxides in solid media. Twenty-eight strains of white rot fungi were checked for their growth on oxide-amended media (ZnO, CaO, Cu2O). All strains displayed growth on Zn-amended plates but to a different extent, and Cu2O-amended plates turned out to be the most toxic oxide. Most of the tested strains solubilized oxalates and produced noticeable clear zones under the mycelium. These clear zones were tested for the presence of organic acids, the level of which was clearly elevated upon exposure of fungal strains to insoluble oxides. We determined the presence of oxalic, malic, and formic acids, with oxalic acid the predominant one.Key words: metal oxalates, oxalic acid, insoluble oxides, wood-rotting fungi.

Le but de ce travail était de déterminer si certaines lignées sélectionnées de champignons appartenant aux pourritures du bois Basidiomycetes, sont capables de croître et de solubiliser différents oxydes insolubles en milieu solide. La croissance de vingt-huit souches de champignons responsables de la pourriture blanche a été testée sur des milieux amendés aux oxydes (ZnO, CaO, Cu2O). Toutes les souches ont crû sur les plaques contenant du Zn mais à des niveaux différents, alors que les plaques contenant du Cu2O se sont révélées les plus toxiques. La plupart des souches testées a solubilisé les oxalates et a produit des zones claires notables autour du mycélium. La production d'acides organiques a été mesurée dans ces zones claires et s'est révélée clairement augmentée par une exposition à des oxydes insolubles chez toutes les souches de champignons. Nous avons mis en évidence la présence d'acide oxalique, d'acide malique et d'acide formique, l'acide oxalique étant prédominant.Mots clés : oxalates métalliques, acide oxalique, oxydes insolubles, champignons de la pourriture du bois.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: August 1, 2006

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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