The ability to control rice blast in N-2C2 treatment was the highest ( %). The ability to biocontrol both sheath blight and rice blast in N-4C treatment was %. | Journal of Science and Technology 55 (1A) (2017) 54-64 DOI: SCREENING OF SALT TOLERANT BACTERIA FOR PLANT GROWTH PROMOTION ACTIVITIES AND BIOLOGICAL CONTROL OF RICE BLAST AND SHEATH BLIGHT DISEASE ON MANGROVE RICE Nguyen Van Minh1,2, Dinh Thi Hien1, Nguyen Bich Hoa1, Nguyen Thi Mai Thi1, Vo Ngoc Yen Nhi3, Duong Nhat Linh1,2, Nguyen Bao Quoc4 1 Open University Ho Chi Minh city, 97 Vo Van Tan Street, Ward 6, District 3, Ho Chi Minh 2 Midoli Co., ltd, 31/13 Street 1, Tan Tao A Ward, Binh Tan District, Ho Chi Minh 3 University of Science, VNU, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh 4 Nong Lam University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh * Email: Received: 30 October 2016; Accepted for publication: 30 May 2017 ABSTRACT From 22 rice, soil and water samples collected in the field of Long An and Tien Giang provinces, we isolated and screened 87 strains of bacteria around the root zone and endophytic bacteria. Through testing the ability of plant growth stimulation, the result showed 16 strains were capable of nitrogen fixation, 13 strains were capable of phosphate solubilization, 27 strains were capable of IAA production and 2 strains had all 3 activities. By the dual testing method and the percentage of inhibition method between bacterial and fungal pathogen, LD5 and LS6 strains had the highest antifungal activity against Rhizotocnia sp. CR1 at %. TS3 and TĐ13 strains had the highest antifungal activity against Magnaporthe sp. BP3 at ± % and 80 ± %, respectively. Furthermore, there were 6 strains inhibiting both Rhizotocnia sp. CR1 and Magnaporthe sp. BP3 (LĐ5, LS4, LS6, LN1, LN6, TS3). The strains were identified by biochemical methods. The results showed that LD5, LS6 and TS3 were % similar to Bacillus thurigiensis, TD13 strain was % similar to Bacillus pantothenticus, TD9 strain was % similar to Azotobacter vinelandii and TD6 .
