Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Suppression of Bacterial Wilt in Tomato Plant Using Pseudomonas putida P84

Pseudomonas putida P84 균주를 이용한 토마토 풋마름병의 억제

  • Published : 2008.04.01
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Abstract

Bacterial wilt caused by Ralstonia solanacearum has become a severe problem on tomato in Korea and no effective control measures are available yet. Pseudomonas species play key roles for the biocontrol of many plant diseases especially in soil. A rhizobacterial population of 150 Pseudomonas strains, isolated from the rhizosphere soil of various plants grown at different sites, was screened for 2,4-diacetylphloroglucinol producing gene (PhlD) by PCR. Two strains (P83 and P84) among them were found to be phlD positive. When the isolates were analysed by 16S rDNA (Sensu Stricto), all isolates yielded amplified products of 1,018bp. Of the 150 isolates of Pseudomonas spp., a bacterial strain P. putida P84 isolated from tomato rhizosphere showed to suppress a wide range of phytopathogenic bacteria in vitro. The best source of carbon for P84 strain were glucose, arabinose, inositol and melibiose. In greenhouse experiments, P84 strain suppressed the development of bacterial wilt in tomato with a control value of 60%.

Ralstonia solanacearum에 의한 풋마름병은 토마토, 감자 등의 작물에 심각한 피해를 주고 있으나, 효과적인 방제법이 없는 실정이다. 일반 병원균의 생물적 방제를 위해 Pseudomonas속의 세균이 가장 일반적으로 이용되고 있는데, 이번 연구에서는 각종 작물의 재배지 토양에서 형광성 세균을 분리하여 Pseudomonas속 특이적 PCR과 항생물질(2,4-diacetylphloroglucinol) 생산 관련 유전자의 유무를 조사하였다. 분리된 150개의 Pseudomonas속 세균 중 항생물질 관련 유전자가 검출된 균은 2균주뿐이였으며, 그중 토마토 근권토양으로 분리된 P. putida P84 세균이 각종 식물 병원 세균에 대해 가장 높은 실내 항균력을 나타내었다. P84 균주의 탄소원별 증식효과는 glucose 첨가시에 가장 좋았으며, arabionse, inositol, melibiose 첨가시에도 우수한 증식효과를 나타내었다. P84세균을 이용한 토마토 풋마름병의 포트실험 결과에서는 60%의 방제효과를 나타내었다.

Keywords

References

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