African Journal of Biotechnology Vol. 4 (10), pp. 1058-1061, October 2005          
ISSN 1684–5315 © 2005 Academic Journals

Full Length Research Paper

Biodegradation of some agricultural residues by fungi in agitated submerged cultures

A. A. Safari Sinegani*, G. Emtiazi, S. Hajrasuliha, and H. Shariatmadari

¹Faculty of Agriculture, Bu-Ali Sina University, Hamadan, Iran.

²Faculty of Science, Isfahan University, Isfahan, Iran.

³Faculty of Agriculture, Isfahan University of Technology, Isfahan, Iran.

⁴Faculty of Agriculture, Isfahan University of Technology, Isfahan, Iran.

Corresponding Author E-mail: aa-safari@basu.ac.ir. Fax: +98 811 4227012.

Accepted 22 March, 2005

Digestibility of agricultural residues in animal feeding is deeply dependent on the amounts and types of their fibers. Biological treatment of agricultural residues is a new method for improvement of digestibility. Therefore, the capacity of a few fungi in biodegradation of some agricultural residues was studied. Losses of crude fiber (CF), neutral detergent fiber (NDF) and acid detergent fiber (ADF) of wheat, barley, rice, wood, and pea straw were investigated in agitated submerged culture during biodegradation by fungi. Biodegradation of the plant residues is dependent on the plant and fungus species. The biodegradation order of plant residues was pea>barley>wheat>rice>wood. A. terreus and T. reesei were more able to degrade the easy degradable plant residues. Rice and wood were degraded more by Armillaria sp., Polyporus sp. and P. chrysosporium. Crude fiber, NDF and ADF of agricultural residues were reduced more by P. chrysosporium. Generally, the reduction of agricultural residues NDF by fungi was more than their ADF. However, Polyporus sp. decreased ADF of wheat straw more. Thus, for improvement of digestibility of agricultural residues, the treatment by white-rot fungi may be recommended.

Key words: Agricultural residues, basidiomycetes, deuteromycetes, fibers.