The Korean Journal of Mycology (한국균학회지)

The Korean Society of Mycology (한국균학회)
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Isolation and Characterization of an Antagonistic Endophytic Bacterium Bacillus velezensis CB3 the Control of Citrus Green Mold Pathogen Penicillium digitatum

감귤저장병 병원균 Penicillium digitatum 방제를 위한 길항 내생세균 Bacillus velezensis CB3의 분리 및 특성 규명

  • Lee, Ji-Hyun (Department of Applied Biology, Chungnam National University) ;
  • Seo, Mun-Won (Department of Applied Biology, Chungnam National University) ;
  • Kim, Hong-Gi (Department of Applied Biology, Chungnam National University)
  • 이지현 (충남대학교 농업생명과학대학 응용생물학과) ;
  • 서문원 (충남대학교 농업생명과학대학 응용생물학과) ;
  • 김홍기 (충남대학교 농업생명과학대학 응용생물학과)
  • Received : 2012.05.30
  • Accepted : 2012.06.21
  • Published : 2012.06.30
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Abstract

In order to develop environment friendly fungicide for the control of citrus green mold (Penicillium digitatum) using endophytic bacteria, the 21 bacterial isolates were isolated from citrus leaves in seven different orchards in Jeju Province. Among the 21 bacterial isolates, 5 bacterial isolates presented antifungal activity against green mold pathogen P. digitatum. The CB3 isolate, which showed the most strong antagonistic effect, was selected through opposite culture against the pathogen. The rod-shaped, gram-positive bacterium CB3 was identified as Bacillus velezensis based on morphological, physiological characteristics, 16S rDNA, and gyr A gene sequence analysis. The isolate CB3 showed strong antifungal activity against two citrus postharvest pathogen P. digitatum. Citrus fruits were treated by wound inoculation with P. digitatum pathogen, and the control efficacy of CB3 culture broth was 66.7% ($1{\times}10^8$ cfu/ml). In conclusion, The stability of CB3 and its strong antifungal activity also lead us to believe that it has potential for application as an environment friendly biological control agent.

대표적인 감귤 녹색곰팡이병(Penicillium digitatum) 방제용 생물농약을 개발하고자 제주도내 7개 과수원으로부터 채집된 citrus 잎에서 21균주의 내생세균을 분리하였다. 그 중 5개의 세균이 녹색곰팡이병균 P. digitatum에 항균활성을 나타냈으며, 대치배양에서 가장 강력한 항균활성을 보인 CB3 균주가 선발되었다. CB3 균주는 간상형의 그람 양성세균으로 생리 생화학적 특성과 gyrA 유전자 염기서열 분석에 의해 Bacillus velezensis로 동정되었다. CB3 균주는 감귤 저장병 병원균 Penicillium digitatum에 강력한 항균활성을 나타내었다. $1{\times}10^5$ spores/ml에 이르는 고농도의 P. digitatum을 감귤에 상처접종했을 때에도, $1{\times}10^8$ cfu/ml의 CB3에 의한 방제효과는 66.7%로 매우 높았다. 본 연구결과, Bacillus velezensis CB3의 안정성과 강한 방제활성 등을 고려할 때 유용 친환경적 방제제로서 매우 가치가 있을 것으로 판단된다.

Keywords

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