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Biodegradation of Wheat Straw by White Rot Fungi Lamba J.S., Wadhwa M., Gangwar M., Bakshi M.P.S.* Department of Animal Nutrition Punjab Agricultural University Ludhiana-141 004, India *Reprint request: Dr. M.P.S. Bakshi, Tel: +91-161-2560370; E-mail: bakshimps@yahoo.com
Abstract Nutritional worth of wheat straw inoculated with lignolytic fungi was assessed. Moistened wheat straw, in batches of 500 g (DM), was inoculated with grain spawn of Trametes hirsuta (TH), Phialophora hoffmannii (PH) or Oidiodendron echinulatum (OE) @ 5 per cent on dry matter basis. Spawned straw filled in perforated polyethylene bags was incubated at 25°C till the appearance of fruiting bodies. Two bags of each fungal strain were removed at 24 h interval for assessing the changes in chemical composition and in sacco DM degradability. The fruiting bodies of TH, PH and OE appeared on 20, 10 and 16 days, respectively. Three fungi differed significantly in their ability to degrade the cell wall components. Maximum hemicellulose utilization and lignin degradation was observed in straw incubated with Oidiodendron and Trametes spp., respectively. The enrichment of straw with microbial protein was associated with increase in DM degradability up to 4 days of incubation in all the three cases. Keeping in view the minimum nutrient losses and considerable nutrient enrichment, Phialophora was rated as the best fungal strain for biodegradation of wheat straw. Top Key words Lignin degradation, Lignolytic fungi, in sacco degradability, Wheat straw. Top | | |
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