Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Biological Control of Sclerotinia sclerotiorum in Lettuce Using Antagonistic Bacteria

길항세균을 이용한 상추 균핵병의 생물학적 방제

  • Chon, Bong-Goan (Department of Environmental Horticulture, The University of Seoul) ;
  • Park, Suji (Department of Environmental Horticulture, The University of Seoul) ;
  • Kim, Jin-Won (Department of Environmental Horticulture, The University of Seoul)
  • 전봉관 (서울시립대학교 환경원예학과) ;
  • 박수지 (서울시립대학교 환경원예학과) ;
  • 김진원 (서울시립대학교 환경원예학과)
  • Received : 2013.01.17
  • Accepted : 2013.02.07
  • Published : 2013.03.31
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Abstract

To isolate antagonistic bacteria against sclerotinia rot of lettuce, caused by Sclerotinia sclerotiorum, soil samples were collected from the diseased greenhouse field in Namyangju city, Gyeong-gi province from 2007 to 2008. A total of 196 bacterial isolates were isolated using serial dilution method. In dual culture assay in vitro, 26 isolates showed more than 80% of inhibition rates of mycelial growth of S. sclerotiorum. Based on 16S rDNA sequence analysis, the 26 isolates were identified as Bacillus megaterium, B. cereus, B. subtilis, Arthrobacter nicotianae, A. ramosus, Pseudomonas filiscindens, Stenotrophomonas maltophilia, Brevibacterium frigoritolerans and Sphingobacterium faecium. The 26 isolates inhibited the mycelial growth of S. sclerotiorum up to 80% and the sclerotial germination 0-100%. In the greenhouse pot test of ten isolates conducted in summer, 2 isolates B. megaterium (DK6) and B. cereus (C210) showed control efficacy on sclerotia viability of S. sclerotiorum, 20% and 35%, respectively. In the greenhouse pot test in winter, the disease incidence of the control group was 80%, whereas those of 9 isolates among 26 were approximately 20%. From the result, the 9 isolates are expected as potentially antagonistic bacteria for biological control of sclerotinia rot of lettuce caused by S. sclerotiorum.

상추 균핵병균에 대하여 길항력을 나타내는 세균을 분리하기 위해 2007년부터 2008년에 걸쳐 초봄에 경기도 남양주시 관내 상추 시설재배지에서 균핵병이 발병한 포장의 토양을 수집하였다. 수집한 토양을 희석평판법을 이용하여 총 196개의 세균을 분리하였고, 분리한 세균을 실험실에서 균핵병균(Sclerotinia sclerotiorum)과의 대치배양을 통해 균사생장억제율이 80% 내외로 우수한 길항력을 나타내는 26개 균주를 선발하였다. 선발된 26개 균주를 16S rDNA염기서열분석으로 동정한 결과 Bacillus megaterium, B. cereus, B. muralis, B. velezensis, Arthrobacter nicotianae, A. oryzae, Pseudomonas fuscovaginae, P. flavescens, Stenotrophomonas maltophilia, Sphingobacterium faecium으로 동정되었다. 길항세균의 균사생장억제율이 높게 나타낸 10개 균주를 대상으로 여름철 포트실험을 통해 균핵 생존에 미치는 영향을 조사한 결과 B. cereus(C210)와 B. megaterium(DK6)이 각각 20%와 35%의 균핵 생존율을 나타냈다. 겨울철에 온실 내에서 포트실험을 통해 상추 균핵병에 대해 방제효과를 조사한 결과 대조구가 80%의 발병율을 나타냈으나, 26개 균주 중 9개 균주가 20% 정도의 발병율을 나타내 향후 상추 균핵병의 생물적 방제를 위한 길항세균으로서의 활용가치가 기대된다.

Keywords

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