Author Topic: Biological Control Activities of Rice-Associated Bacillus sp. Strains  (Read 656 times)

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Biological Control Activities of Rice-Associated Bacillus sp. Strains against Sheath Blight and Bacterial Panicle Blight of Rice

Potential biological control agents for two major rice diseases, sheath blight and bacterial panicle blight, were isolated from rice plants in this study. Rice-associated bacteria (RABs) isolated from rice plants grown in the field were tested for their antagonistic activities against the rice pathogens, Rhizoctonia solani and Burkholderia glumae, which cause sheath blight and bacterial panicle blight, respectively. Twenty-nine RABs were initially screened based on their antagonistic activities against both R. solani and B. glumae. In follow-up retests, 26 RABs of the 29 RABs were confirmed to have antimicrobial activities, but the rest three RABs did not reproduce any observable antagonistic activity against R. solani or B. glumae.

This is Plant Pathology project work and study suggests that Bacillus-type bacteria are predominant in rice plants as antagonists against pathogens. Bacillus spp. have been predominantly used to control various crop diseases. Recent examples include citrus canker caused by Xanthomonas axonopodis pv. citri , bacterial wilt and late blight in tomato caused by Ralstonia solanacearum and Phytophthora infestans, respectively, bacterial blight in rice caused by Xanthomonas oryzae pv. oryzae, and wheat root rot caused by Fusarium graminearum.

Specifically, majority of the antagonistic RABs in this study (12 out of 26 RABs) appeared to be B. amyloliquefaciens based on the nucleotide sequences of 16S rDNA and gyrB, even though this identification is still inconclusive due to the closer similarity of their recA sequences to B. subtilis. Strains of B. amyloliquefaciens have been reported as a good biological control agent for other crop diseases, including bacterial wilt and powdery mildew of tomato, stem rot of canola, bacterial wilt of peanut, ring rot of apple, and bacterial soft rots of vegetables.

Authors: Bishnu K. Shrestha, Hari Sharan Karki, Donald E. Groth, Nootjarin Jungkhun, Jong Hyun Ham

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