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KMID : 0613820080180060858
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Journal of Life Science
2008 Volume.18 No. 6 p.858 ~ p.864
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Biological Control of Plant Pathogens by Bacillus sp. AB02
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Kim Keun-Ki
Kim Yung-Chul
Choi Young-Hwan
Shin Teak-Soon
Park Ki-Do
Kang Ui-Gum
Choi Yong-Lark
Park Hyean-Cheal
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Abstract
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In the greenhouse fields for fruits and vegetables during the winter in Korea, there are serious damages by the sclerotium diseases due to the low temperature and humidity. This study was carried out to select an antagonic agent for the biological control of the sclerotium diseases. The 55 antagonic agents were selected from the rhizosphere in soil where the fruits and vegetables were cultivated in the green house fields, and strain AB02 among the tested isolates was estimated to be the strongest antagonist against the sclerotium disease. Using strain AB02, the antifungal spectrum was tested against 5 different plant pathogens. According to the results of the test, strain AB02 showed the high antagonistic effect against Botrytis cinerea and Sclerotinia sclerotiorum. For the experiment of biological control against the sclerotium disease, it was estimated the suppression effect and the control effect by the strain in the pot experiment using the green perilla. According to the result of the pot experiments, the suppression effect was 40% and the control effect was 62%, respectively. For the stimulation effect of the tested plant growth by strain AB02 compared to the control, it was improved as 120% for the total length, 141% for the liveweight, 121% for the total number of leaves, 185% for the leaf area, and 327% for the liveweight of the root, respectively. Strain AB02 showing the antagonistic effect against the sclerotium disease and the stimulation effect for the plant growth was identified as Bacillus sp.
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KEYWORD
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Biologicalcontrol, pathogens, plantgrowthpromoting, Bacillus
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