Novel endophytic bacteria isolated from rice plant against rice sheath blight

Endophytic bacteria lived in rice plant have the potential of antagonistic activity against various diseases of rice, including rice sheath blight caused by Rhizoctonia solani Kuhn. The goal of the research outlined in this paper was to explore the potential uses of rice endophytic bacteria in control of rice bacterial leaf blight. The antagonistic activity of different bacterial strains were significantly different. The number of endophytic bacteria with relative inhibition ratio (RIR) more than 50 % in first screening was 25, in which there was 16 strains with RIR more than 100 % in first screening. The ratio of strains with significant antagonistic activity was 55.56%. 11 strains with RIR more than 100 % in second screening. RIR of the primary extracellular product of 9 strains was more than 150%.