Screening of white-rot fungi on (14C)lignin-labelled and (14C)whole-labelled wheat straw |
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Authors: | Eduardo Agosin Jean-Jacques Daudin Etienne Odier |
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Affiliation: | (1) Laboratoire de Microbiologie, Institut National Agronomique Paris-Grignon 9, rue de l'Arbalète, F-75005 Paris, France;(2) Chaire de Mathématiques, Institut National Agronomique Paris-Grignon 9, rue de l'Arbalète, F-75005 Paris, France |
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Abstract: | Summary 74 Basidiomycetes have been tested for ligninolytic capability on (14C)lignin-labelled wheat straw. Fifteen strains were selected and rested more accurately for ligninolytic activity and the capacity to degrade wheat straw. The asymptote, inflexion point and degradation rate were determined using a model approach. The fungi exhibited very different responses with respect to lignin biodegradation: high asymptote for Pleurotus ostreatus (77%), low inflexion points for Sporotrichum pulverulentum Nov. (6.1 days) and Pycnoporus spp. (2.7 to 4.7 days) with high and slow degradation rates, respectively (0.91% and 0.45% of 14CO2 release/day). Degradation values for (14C)whole-labelled wheat straw exhibited less variation. Finally, the strains Pleurotus ostreatus, Dichomitus squalens and Bjerkandera adusta showed the highest selectivity of lignin removal. |
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