Screening of Endophytic Bacteria Isolated from Rice Plant Antagonistic Rice Sheath Blight

摘要

Endophytic bacteria lived in rice plant have the potential of antagonistic activity against to 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 sheath blight. The methods for screening of endophytic bacteria antagonistic against rice sheath blight was confrontation culture method in a petri dish. This experiment resulted 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 of total 45 strains, in which there was 16 strains with RIR more than 100 % in first screening. 11 strains with RIR more than 100% in second screening. RIR of the primary extracellular product of 9 strains was more than 150%. The study concluded that total 45 strains of endophytic bacteria isolated from rice plant had antagonist against R. solani.