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Physiological, Biochemical and Genetic Characteristics of Ralstonia solanacearum Strains Isolated from Pepper Plants in Korea

고추에서 분리된 Ralstonia solanacearum 계통의 생리, 생화학 및 유전적 특성

  • Lee, Young Kee (Crop Protection Division, National Academy of Agricultural Science, Rural Development Administration) ;
  • Kang, Hee Wan (Graduate School of Future Convergence Technology, Hankyong National University)
  • 이영기 (국립농업과학원 작물보호과) ;
  • 강희완 (국립한경대학교 미래융합기술대학원)
  • Received : 2013.10.30
  • Accepted : 2013.11.19
  • Published : 2013.12.31

Abstract

Totally sixty three bacteria were isolated from lower stems showing symptoms of bacterial wilt on pepper plants in 14 counties of 7 provinces, Korea. The isolates showed strong pathogenicity on red pepper (cv. Daewang) and tomato (cv. Seogwang) seedlings. All virulent bacteria were identified as Ralstonia solanacearum based on colony types, physiological and biochemical tests and polymerase chain reaction (PCR). All R. solanacearum isolates from peppers were race 1. The bacterial isolates consisted of biovar 3 (27%) and biovar 4 (73%). Based on polymorphic PCR bands generated by repetitive sequence (rep-PCR), the 63 R. solanacearum isolates were divided into 12 groups at 70% similarity level. These results will be used as basic materials for resistant breeding program and efficient control against bacterial wilt disease of pepper.

전국 7개도 14개 시 군의 주요 고추 재배지에서 시들음 증상을 나타내는 식물체의 땅가 줄기에서 분리 선별된 63개 풋마름병균들의 특성을 조사하였다. 고추에서 분리된 풋마름병균들은 고추(cv. 대왕)와 토마토(cv. 서광)에 강한 병원성을 나타냈다. 모든 병원균들은 배양적, 생리 생화학적 특성 및 특이 PCR 검출에 의하여 Ralstonia solanacearum으로 동정되었다. 고추에서 분리된 63개 풋마름병균들은 race 1 계통으로 2가지 biovar로 구분되었는데, biovar 3은 17개 균주로 27%였고 biovar 4는 46개의 균주로 73%였으며, biovar 4의 생리형이 우점계통이었다. Rep-PCR에 의한 국내 고추 풋마름병균들의 유전적 다양성을 확인한 결과, 70%의 유사성을 기준으로 12개의 group으로 구분되었다. 이러한 결과들은 국내 고추 풋마름병에 대한 방제와 저항성 품종 육성에 중요한 기초 자료를 제공할 것이다.

Keywords

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