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KMID : 0613820020120040416
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Journal of Life Science
2002 Volume.12 No. 4 p.416 ~ p.422
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Biocontrol of Vegetables Damping-off by Bacillis ehimensis YJ-37
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Kim Jin-Ho
Choi Yong-Hwa
Kang Sang-Jae
Rhee In-Koo
Joo Gil-Jae
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Abstract
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Bacillus ehimensis YJ-37 was observed as a potential biological agent to control the occurrence of diseases and plant growth-promoting rhizobacteria (PGPR). Population density of B. ehimensis YJ-37 were higher 1.2～2 times in main roots and lateral roots than from nonrhizosphere soil and persisted around 104 cfu/g root on the watermelon and radish root system upto 30 days after growing in pot condition. As a PGPR, B. ehimensis YJ-37 enhanced plant growth of watermelon and radish by soil treatment. The leaf area, hypocotyl length, root length and dry weight of radish were about 85, 33, 23 and 89% more than that of untreated plant, respectively. In case of watermelon were about 63, 27, 25 and 69% more than that of untreated plant, respectively. Biocontrol of damping-off in watermelon and radish caused by Rhizoctonia solani AG-4 and Pythium ultimum were carried out in pots using B. ehimensis YJ-37. The results showed that might contribute to it’s suppression of damping-off disease in field plants.
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KEYWORD
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Biocontrol, Bacillus ehimensis, Rhizoctonia solani, Pythium ultimum, watermelon, radish
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