Research in Plant Disease 2010;16(1):41-47.
Published online April 30, 2010.
고추 역병 방제를 위한 저영양 길항세균 7F 균주의 동정
김동관, 여윤수, 권순우, 장길수, 이창묵, 이미혜, 김수진, 구본성, 윤상홍
Identification of the Oligotrophic Bacteria Strain 7F Biocontrolling Phytophthora Blight Disease of Red-pepper
Dong Gwan Kim, Yun Soo Yeo, Soon Wo Kwon, Kil Su Jang, Chang Muk Lee, Mi Hye Lee, Soo Jin Kim, Bon Sung Koo, Sang Hong Yoon
A total of 10,753 oligotrophic bacteria were isolated from the cultivated soils of red-pepper infected by Phytophthora blight disease in various regions of Korea (Chungju, Anmyon, Taean, Andong, Eumsung and Goesan). Seven bacteria isolates among these collected resources were selected by the first screening of in vitro antagonistic assay against major several plant pathogenic fungi including Phytophthora capsici. Finally, strain 7F was selected by pot assay for a possible biological control agent against Phytophthora blight disease of pepper seedling in the greenhouse. Strain 7F was identified as Bacillus subtilis on the basis of its 16S rDNA sequence analysis and as standardized biochemical characteristics assay kits such as API20 NE. In the experiment of P. capsici zoospore infected red-pepper on the pot test, infection rate of red-pepper with none-treatment to Phytophthora blight disease was 87%, while the rate was only 6% in the pot treated with strain 7F. This result indicated that the Bacillus subtilis strain 7F will be useful as a potential biocontrol agent for Phytophthora blight disease of red-pepper.
Key Words: Antagonistic bacteria, Biological control, Bacillus subtilis, Oligotrophic bacteria, Phytophthora blight

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