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http://dx.doi.org/10.5423/RPD.2010.16.1.041

Identification of the Oligotrophic Bacteria Strain 7F Biocontrolling Phytophthora Blight Disease of Red-pepper  

Kim, Dong-Gwan (Research Center for Drugs, Konkuk University)
Yeo, Yun-Soo (National Agrobiodiversity Center, National Academy of Agricultural Science, RDA)
Kwon, Soon-Wo (National Agrobiodiversity Center, National Academy of Agricultural Science, RDA)
Jang, Kil-Su (Youngyang Pepper Experiment Station, Gyeongbuk Provincial RDA Youngyang)
Lee, Chang-Muk (Dept. of Functional Materials Development, National Academy of Agricultural Science, RDA)
Lee, Mi-Hye (Dept. of Technical Support, Yeoju-gun Agricultural Technology Center)
Kim, Soo-Jin (National Agrobiodiversity Center, National Academy of Agricultural Science, RDA)
Koo, Bon-Sung (Dept. of Functional Materials Development, National Academy of Agricultural Science, RDA)
Yoon, Sang-Hong (Dept. of Functional Materials Development, National Academy of Agricultural Science, RDA)
Publication Information
Research in Plant Disease / v.16, no.1, 2010 , pp. 41-47 More about this Journal
Abstract
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 nonetreatment 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.
Keywords
Antagonistic bacteria; Biological control; Bacillus subtilis; Oligotrophic bacteria; Phytophthora blight;
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