Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Biocontrol of Cabbage Clubroot by the Organic Fertilizer Using Streptomyces sp. AC-3.

Streptomyces sp. AC-3을 이용한 배추 무사마귀병의 생물학적 방제

  • Published : 2004.06.01
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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.

본 연구는 배추 무사마귀병의 생물학적 방제를 위해 수행되었다. 배추 무사마귀병균 Plasmodiophora sp외 길항미생물은 낙엽부식토양에서 분리한 350여 종의 토양미생물 중에서 가장 길항력이 높은 방선균 AC-3균주를 이용하였고, AC-3 균주는 16S rDNA 염기서열분석방법으로 Streptomyces sp.로 동정되었다. Streptomyces sp. AC-3은 배양액 $m\ell$당 9.3 units의 chitinase를 생산하였다. 그 결과 배추 무사마귀병균 Plasmodiophora sp.의 배양액에 Streptomyces sp. AC-3을 접종하고 배양하면 Plasmodiophora sp.의 균체가 팽윤되거나 세포벽이 용해된 모습이 관찰되었다. Streptomyces sp. AC-3은 전딘도 배추 무사마귀병이 만연했던 포장에서 재배 시험하기 위해 제형화시키고 유기질비료에 첨가하여 이용하였다. 미생물제제를 첨가하지 많고 제조한 유기질비료(H-1)(대조구)와 미생물제제 첨가하여 제조한 유기질비료(H-2)(처리구)에 의한 포장시험에서 배추의 생육은 재배 40일 까지는 거의 차이를 나타나지 않았으나 재배 60일에는 다소 차이를 나타내었다. 배추의 병 발생율을 조사한 결과 무사마귀병은 H-1 비료 처리구에서는 36.17% 병이 발생되었으나 H-2 비료 처리구에서는 18.28% 발병되어 약 50%의 방제효과를 나타내었으며, 균핵병, 잎마름병, 그루썩음병 등에서도 길항효과를 나타내어 생물학적 방제가 가능한 균주로 확인되었다.

Keywords

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