Evaluation of Interactive Relationship Among Rice Fungal Pathogens with Special Reference to the Production of Extracellular Enzymes

摘要

A total of twelve (Rhizoctonia solani, Curvularia lunata, Alternaria padwickii, Nigrospora oryzae, Sclerotium hydrophilum, Fusarium verticillioides, Fusarium sp., Rhizopus sp., Choanephora cucurbitarum, Acremonium sp., SM-1 and SM-2) fungi were isolated from leaves and stem of rice (Swarna cultivar) plant. The present study was carried out to evaluate the antagonistic activity of rice fungus and to detect the new sources of extracellular enzymes from fungi to understand their functional role in the host. Among twelve fungi, only four namely, S. hydrophilum, Rhizopus sp., Nigrospora oryzae and Fusarium sp. showed more than 40 per cent antagonistic activity against rest of the isolated pathogens. The fungi, Rhizopus sp. and S. hydrophilum, are the most dominant antagonist interaction against another isolated fungus with having the highest total of 566.49 and 441.92 percentage inhibition respectively. R. solani and Fusarium sp. were positive for amylase, S. hydrophilum and F. verticillioides were positive in cellulase production, while N. oryzae and S. hydrophilum were positive for laccase production. R. solani, C. lunata, A. padwickii, S. hydrophilum and Rhizopus sp. were positive in pectinase production.