Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Isolation and Identification of Antagonistic Bacterium Active against Sclerotinia sclerotioum Causing Sclerotinia Rot on Crisphead Lettuce

결구상추 균핵병균(Sclerotinia sclerotioum)에 대한 길항세균의 분리 및 동정

  • Kim, Han-Woo (Center for Biotechnology, Dong-A University) ;
  • Lee, Kwang-Youll (College of Natural Resources and Life Science, Dong-A University) ;
  • Baek, Jung-Woo (College of Natural Resources and Life Science, Dong-A University) ;
  • Kim, Hyun-Ju (College of Natural Resources and Life Science, Dong-A University) ;
  • Park, Jong-Young (College of Natural Resources and Life Science, Dong-A University) ;
  • Lee, Jin-Woo (College of Natural Resources and Life Science, Dong-A University) ;
  • Jung, Soon-Je (College of Natural Resources and Life Science, Dong-A University) ;
  • Moon, Byung-Ju (College of Natural Resources and Life Science, Dong-A University)
  • 김한우 (동아대학교 농업생명연구소) ;
  • 이광렬 (동아대학교 생명자원과학대학) ;
  • 백정우 (동아대학교 생명자원과학대학) ;
  • 김현주 (동아대학교 생명자원과학대학) ;
  • 박종영 (동아대학교 생명자원과학대학) ;
  • 이진우 (동아대학교 생명자원과학대학) ;
  • 정순재 (동아대학교 생명자원과학대학) ;
  • 문병주 (동아대학교 생명자원과학대학)
  • Published : 2004.12.01
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Abstract

The fungus genus Sclerotinia contains a number of important plant pathogens. Vegetable growers in our country are probably most familiar with Sclerotinia sclerotiorum, the causes of sclerotinia rot on crisphead lettuce. S. sclerotiorum has a wide host range which can include lettuce as well as crops such as broccoli, cabbage, carrots, celery, beans, peppers, potatoes, stocks, and tomato. Some fungicides, including benomyl, are effective in some crops, but not all. So, we isolated a antagonistic bacteria that are active on sclerotinia rot caused by S. sclerotiorum and that can be used to control it. About 702 strains had been isolated from soil around plant roots in the field. Ten strains showed strong antifungal activity against S. sclerotiorum. In pot test for antagonistic activity, A-7 strain showed high control value against the pathogen when compared with others. The strain was, therefore, selected as a biocontrol candidate against sclerotinia rot and its biochemical properties and 16S rDNA sequence was analyzed. The A-7 strain was highly related to Bacillus subtilis and B. amyloliquefaciens. To confirm precise identification, we had performed gyr A gene sequences analysis. Its sequence had 96% similarity with B. amyloliquefaciens. Consequently, the isolate was identified as B. amyloliquefaciens A-7.

결구상추에 심각한 피해를 일으키는 균핵병의 생물학적 방제를 위한 기초연구로서 균핵병원균 S. sclerotioum YR-1 대한 우수 길항세균을 선발하고 동정하였다. 건전 결구상추에서 분리한 세균들 중 균핵병원균의 균사생육저지 효과가 큰 10 균주를 길항세균으로 1차 선발하고 이들 일차 길항세균에 의한 방제효과를 생육실내 포트검정한 결과, A-2, A-7 및 RH-4 균주의 방제가가 각각 73.0%, 85.0%, 80.0%이었으며, 이 중 가장 높은 방제가를 보인 A-7 균주를 우수 길항균으로 최종선발하였다. A-7 균주의 생화학적 특성 및 16S rDNA와 gyrA 염기서열을 분석한 결과 Bacillus amyloliquefaciens로 동정되었으며, B. amyloliquefaciens A-7으로 명명하였다.

Keywords

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