Abstract

풋마름병징을 나타내는 고추와 토마토 식물체로부터 35개의 풋마름병균 계통들을 분리하여 생리.생화학 실험, 병원성 실험, 유전학적 실험을 통해 유전적 다양성을 연구하였다. 생리 생화학 실험과 종특이적 polymerase chain reaction(PCR)을 실시한 결과 풋마름병균 계통들은 모두 Ralstonia solanacerum biovar 4로 동정되었다. 분리균은 고추와 토마토 유묘를 이용해 병원성이 확인되었다. Repetitive sequence-based PCR(rep-PCR) 결과를 토대로 계통도 분석을 한 결과 고추와 토마토 분리균은 6개의 group으로 나뉘었으며, 유전적 다양성은 높게 나타났다. 풋마름병균 계통들의 그룹간에는 지역별, 기주별 특이성은 관찰되지 않았다. A total of 35 strains of Ralstonia solanacearum isolated from wilted pepper and tomato plants in Korea were analyzed for their genetic diversity by bacteriological, pathological and molecular biological approaches. All the strains were identified as R. solanacearum biovar 4 on the basis of physiological and biochemical tests, and species-specific PCR primers. Pathogenicity of the strains was confirmed by inoculating on 4-week-old pepper and tomato seedlings. Using cluster analysis based on repetitive sequence-based polymerase chain reaction (rep-PCR) genomic fingerprints, R. solanacearum strains isolated from pepper and tomato in Korea divided into 6 groups showing a high degree of genetic diversity at 55% similarity level. The genetic diversify of strains was not significantly correlated with their geographic origins and host plants.

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