Rice sheath blight, caused by Rhizoctonia solani is one of the major diseases of rice. The pathogen infects rice plants

directly through stomata or using lobate appressoria and hyphal masses called infection cushions. Initially the mycelium

looked thread like structure, milky white in colour than mycelium converted mature Sclerotia. After the screening of

different rice genotypes using 0 to 9 scaling (SES-IRRI), according to Leaf detach method, Pusa Basmati-1 was found

highly susceptible variety and Swarna Sub-1 was susceptible one. Among wild rice, O. australiensis was observed resistant

sps. While Oryza rufipogon was found Moderately Resistant sps. Approximately the same results were found in humidified

chamber condition. During molecular analysis, in control condition, 8A1 gene/primer was not expressed with the cDNA

transcript of Pusa Basmati-1 and Swarna sub-1, was expressed in stressed condition in both the cultivar with the product size

155 bp. In both wild rice namely O. rufipogon and O. australiensis, 8A1 gene was expressed in control as well as stressed

condition with the product size 155 bp. While 4C7 gene/primer was expressed continuously in control and stressed condition

in susceptible rice cultivars; Pusa Basmati-1, Swarna sub-1 and wild rice accessions; O. rofipogon and O. australiensis with

the product size 162 bp.

Key Words: Gene, Pathogen, Resistant, R. solani, Sheath blight