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An Antifungal Agent Produced by Bacillus thuringiensis BK4, an Antagonistic Bacterium against Fusarium Wilt Disease of Tomato  

Lim, Jong-Hee (Department of Applied Microbiology, College of Natural Resources, Yeungnam University)
Jung, Hee-Kyoung (Department of Applied Microbiology, College of Natural Resources, Yeungnam University)
Kim, Sang-Dal (Department of Applied Microbiology, College of Natural Resources, Yeungnam University)
Publication Information
Applied Biological Chemistry / v.50, no.1, 2007 , pp. 18-22 More about this Journal
Abstract
The optimum production condition for the antibiotic from Bacillus thuringiensis BK4 was determined, and the suppression rate of Fusarium-wilt by the butanol-extracted antibiotic was verified by employing tomatoes in vitro and in vivo pot tests. Cell growth and antifungal activity were the best when 0.5% xylose and 0.2% peptone No.3 were given as carbon and nitrogen sources, respectively, in the presence of 5mM $CaCl_2$. The partially purified antibiotic successfully prevented Fusarium oxysporum pathogen in pot experiments. When the pots were treated with both live cells and the partially purified antibiotic, an additive-effect was seen in the suppression of Fusarium-wilt, but synergistic effect was not detected. The antibiotic, denoted BK4, purified by Sephadex LH-20 column chromatography was eluted with a single peak at a retention time of 38 min. on prep-HPLC; Minimum inhibition concentration of the homogenous antibiotic was determined to be 50${\mu}$g/ml.
Keywords
Fusarium wilt; Fusarium oxysporum; antifungal antibiotic; biocontrol;
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Times Cited By KSCI : 4  (Citation Analysis)
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