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Biocontrol of Cabbage Clubroot by the Organic Fertilizer Using Streptomyces sp. AC-3.  

주길재 (경북대 농업과학기술연구소)
김영목 (경북대 농업과학기술연구)
김정웅 (경북대학교 농화학)
김원찬 (경북대학교 농화학)
이인구 (경북대학교 농화학)
최용화 (상주대 식물자원학)
김진호 (상주대 식물자원학과)
Publication Information
Microbiology and Biotechnology Letters / v.32, no.2, 2004 , pp. 172-178 More about this Journal
Abstract
This research is performed for a biological control of Chinese cabbage clubroot, we isolated an antagonistic bacterium AC-3 against Plasmodiophora sp., causal pathogens of cabbage clubroot. The isolated strain was identified as Streptomyces sp. by culture morphology, biochemical reactions, and homology research based on l6S rDNA sequences. Streptomyces sp. AC-3 produced chitinase (9.3 units/$m\ell$) in culture broth. So Plasmodiophora sp. mycelia changed abnonnal swelling, curling and branching mycelia by Streptomyces sp. AC-3 culture. In a field infected by Plasmodiophora sp., the treatment of a organic fertilizer added 2% Streptomyces sp. AC-3 microbial inoculant, it resulted in about 50% reducing the severity of cabbage clubroot significantly on cabbage plants compared with treated organic fertilizer plants. Additional disease such as sclerotinia rot, fusarium wilt and pythium rot were also significantly reduced by the treatment of the organic fertilizer added Streptomyces sp. AC-3 microbial inoculant.
Keywords
Biocontrol; cabbage clubroot; Streptomyces sp.;
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Times Cited By SCOPUS : 2
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