Inactivation of phytotoxin produced by the rice sheath blight pathogen Rhizoctonia solani |
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Authors: | Sriram S Raguchander T Babu S Nandakumar R Shanmugam V Vidhyasekaran P Balasubramanian P Samiyappan R |
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Institution: | Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore, India. |
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Abstract: | The rice sheath blight pathogen, Rhizoctonia solani, produces a toxin designated as RS-toxin, a carbohydrate compound containing mainly alpha-glucose and mannose. Different microflora were tested for RS-toxin inactivation. Isolates of Trichoderma viride inactivated this toxin when it was provided as the sole food source, and these isolates reduced the severity of toxin-induced symptoms and electrolyte leakage from rice cells. The best-performing isolate, TvMNT7, produced two extracellular proteins of 110 and 17 kDa. The high molecular mass protein was shown to have alpha-glucosidase activity. The purified 110 kDa protein was able to reduce RS-toxin activity. |
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