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Agar-Block Microcosms for Controlled Plant Tissue Decomposition by Aerobic Fungi

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Decomposition of Lignocellulose by Cyathus stercoreus (Schw.) de Toni NRRL 6473, a "White Rot" Fungus from Cattle

D T Wicklow¹, R W Detroy, B A Jessee

¹Northern Regional Research Center, Agricultural Research, Science and Education Administration, U.S. Department of Agriculture, Peoria, Illinois 61604.

Applied and Environmental Microbiology

|July 1, 1980

Summary

Cyathus stercoreus effectively degraded lignin in wheat straw by 45% and enhanced cellulose digestibility. This fungus offers potential for biologically modifying agricultural residues for improved biofuel production.

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Area of Science:

Mycology
Biotechnology
Bioremediation

Background:

Agricultural residues like wheat straw contain lignin and cellulose, limiting their efficient utilization.
Biological modification of lignocellulosic biomass is crucial for sustainable biofuel production.
Fungi possess enzymatic capabilities to break down complex plant polymers.

Purpose of the Study:

To evaluate the efficacy of Cyathus stercoreus in degrading lignin and improving the digestibility of wheat straw.
To assess the potential of C. stercoreus for the bioconversion of lignocellulosic materials.

Main Methods:

Isolation and identification of Cyathus stercoreus (NRRL 6473) from cattle dung.
Fermentation of wheat straw with C. stercoreus for 62 days at 25°C.
Quantification of lignin loss and assessment of alpha-cellulose digestibility for glucose release.

Main Results:

Cyathus stercoreus achieved a 45% reduction in wheat straw lignin content.
Fermentation significantly improved wheat straw digestibility, yielding 230 mg of glucose per 1,000 mg of residue.
The fungus demonstrated effective enzymatic hydrolysis of cellulose.

Conclusions:

Cyathus stercoreus is highly effective in the biological degradation of lignin in wheat straw.
This fungus enhances the accessibility of cellulose for enzymatic hydrolysis, increasing glucose yield.
C. stercoreus shows significant promise for the bioprocessing of lignocellulosic agricultural residues.