Fungal biodegradation and biotransformation of soluble lignocarbohydrate complexes from straw. [Aspergillus japonicus, Polyporus versicolor]
Aspergillus japonicus is an efficient degrader of phenolics and carbohydrates present in a mixture of soluble lignocarbohydrate complexes extracted from wheat straw. Trichoderma species attacked part of the carbohydrate but hardly affected the aromatic portion of this solution. Polyporus versicolor had a complex effect; polymerization of low-molecular-size phenolics accompanied the degradation of aromatic and carbohydrate polymers. The addition of xylose to the medium facilitated depolymerization of lignin by the fungi tested and prevented the polymerization of low-molecular-size fractions of lignocarbohydrate complexes by P. versicolor. P. versicolor, in contrast to A. japonicus and Trichoderma species, also excreted into the medium considerable amounts of laccase, but only in the absence of endogenous or exogenous carbohydrates. Apparently, laccase is involved in polymerization rather than degradation of lignin in this organism. A number of extracellular glycanases were also secreted by these fungi. 19 references
- Research Organization:
- Dept. of Plant Genetics and Biophysics, Weizmann Inst. of Science, Rehovot 76100, Israel
- OSTI ID:
- 5162605
- Journal Information:
- Appl. Environ. Microbiol.; (United States), Journal Name: Appl. Environ. Microbiol.; (United States) Vol. 46:2; ISSN AEMID
- Country of Publication:
- United States
- Language:
- English
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59 BASIC BIOLOGICAL SCIENCES
AROMATICS
ASPERGILLUS
BIODEGRADATION
CARBOHYDRATES
CEREALS
CHEMICAL REACTIONS
DECOMPOSITION
ENZYME ACTIVITY
FUNGI
GRAMINEAE
GRASS
HYDROXY COMPOUNDS
LIGNIN
ORGANIC COMPOUNDS
PHENOLS
PLANTS
POLYMERIZATION
POLYSACCHARIDES
SACCHARIDES
STRAW
TRICHODERMA
WHEAT