Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Characterization of Bacillus licheniformis KJ-9 Isolated from Soil

토양으로부터 분리한 Bacillus licheniformis KJ 9의 특성

  • Seo, Dong-Cheol (Institute of Agriculture and Life Sciences, Gyeongsang National University) ;
  • Ko, Jeong-Ae (Dept. of Microbiological Engineering, Jinju National University) ;
  • Gal, Sang-Won (Dept. of Microbiological Engineering, Jinju National University) ;
  • Lee, Sang-Won (Dept. of Microbiological Engineering, Jinju National University)
  • 서동철 (경상대학교 농업생명과학원) ;
  • 고정애 (진주산업대학교 미생물공학과) ;
  • 갈상완 (진주산업대학교 미생물공학과) ;
  • 이상원 (진주산업대학교 미생물공학과)
  • Received : 2009.12.15
  • Accepted : 2009.12.18
  • Published : 2010.03.30
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Abstract

In order to produce high-quality fermenting composts, a microorganism was isolated from the natural world. The bacterium has not only in high enzyme activities but also had good antimicrobial activities against phytopathogenic microorganisms. Its cultivating characteristics were then investigated. Bacterium KJ-9, which contains high CMCase, protease and chitinase activities and excellent antimicrobial activities against phytopathogenic microorganisms, was separated from leaf mold and identified as Bacillus licheniformis by two methods: Bergey's Manual of Systematic Bacteriology and API 50 CHL Carbohydrate Test Kit (Bio Merieux, France) using an ATB (Automated Identification) computer system (Bio Merieux, France). Optimal medium for cultivation of B. licheniformis was 2% soluble starch as a carbon source, 0.5% yeast extract as a nitrogen source and 0.05% $MgSO_4{\cdot}7H_2O$. Optimal growth conditions of pH, temperature and shake speed were pH 7.0, $50^{\circ}C$ and 180 rpm, respectively. Culture broth of B. licheniformis KJ-9 cultured for 36~60 hr was effective in fungicidal activities against plant pathogens including Botrytis cinerea, Corynespora cassicola, Fusarium oxysporum, and Rhizoctonia solani.

고품질의 발효퇴비를 생산할 목적으로 자연계로부터 효소활성이 높고 식물병원성 균주에 대한 항균활성이 우수한 미생물을 순수분리 하여 배양학적 특성을 검토하였다. 부엽토 등으로부터 CMCase, protease 및 chitinase 활성이 높고 식물병원성 균주에 대하여 항균활성이 우수한 KJ-9균주를 분리한 다음 형태학적 및 생화학적 특성을 검토하고 Bergey's Mannual of Systematic Bacteriology의 방법과 ATB (Automated Identification) computer system (Bio Merieux, France)을 이용한 API 50 CHL Carbohydrate Test Kit(Bio Merieux, France)를 통하여 동정한 결과 Bacillus licheniformis로 밝혀졌다. B. licheniformis KJ-9의 최적배지 성분을 검토한 결과 탄소원은 1.5% soluble starch, 질소원은 0.5% yeast extract, 무기염은 0.05% $MgSO_4{\cdot}7H_2O$ 이었으며, 배지의 초기 pH는 7.0, 배양온도는 $50^{\circ}C$ 그리고 진탕속도는 180 rpm으로 밝혀졌다. 최적배양 조건으로 B. licheniformis KJ-9를 배양하였을 때 36~60 hr째의 배양액은 잿빛 곰팡이병을 유발하는 Botrytis cinerea, 잎마름병의 원인균인 Corynespora cassicola, 시들음병을 유발하는 Fusarium oxysporum, 잘록병의 원인균인 Rhizocfonia solani의 식물병원성 미생물 균사생장을 효과적으로 억제하였다.

Keywords

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