The Korean Journal of Mycology (한국균학회지)

The Korean Society of Mycology (한국균학회)
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Isolation of the Bacterium Pseudomonas sp. HC1 Effective in Inactivation of Tolaasin Produced by Pseudomonas tolaasii

버섯 세균성갈색무늬병원균(Pseudomonas tolaasii)의 분비 독소(tolaasin)를 저해하는 미생물 Pseudomonas sp. HC1

  • 이찬중 (농촌진흥청 국립원예특작과학원 버섯과) ;
  • 유영미 (농촌진흥청 국립원예특작과학원 버섯과) ;
  • 한주연 (농촌진흥청 국립원예특작과학원 버섯과) ;
  • 전창성 (농촌진흥청 국립원예특작과학원 버섯과) ;
  • 정종천 (농촌진흥청 국립원예특작과학원 버섯과) ;
  • 문지원 (농촌진흥청 국립원예특작과학원 버섯과) ;
  • 서장선 (농촌진흥청 국립원예특작과학원 버섯과) ;
  • 한혜수 ;
  • 차재순 (충북대학교 식물의학과)
  • Received : 2013.10.01
  • Accepted : 2013.11.18
  • Published : 2013.12.30
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Abstract

A Gram-negative bacterium was isolated from mushroom media that markedly reduces the level of extracellular toxins (i.e., tolaasins) produced by Pseudomonas tolaasii, the most destructive pathogen of cultivated mushrooms. The HC1 strain was selected as detoxifying tolaasin by bioassay on potato and it was identified Pseudomonas sp. by the cultural, morphological and physiological characteristics, and analysis of the 16S rRNA. The isolated bacterium is saprophytic but not parasitic nor pathogenic to cultivation mushroom. The isolated bacterium for P. tolaasii cell, was sufficient for detoxification in vitro. Inoculation of the isolated bacterium prevents the development of bacterial disease in Pleurotus ostreatus, Flammunia velutipes and Agaricus bisporus. Control efficacy of brown blotch of strain HC1 treatment was 69, 68 and 55% on Agaricus bisporus, Flammulina velutipes and Pleurotus ostreatus, respectively. The suppressive bacterium may be useful in future for the development of biocontrol system and the construction of genetically modified edible fungi resistant to the disease caused by P. tolaasii.

Pseudomonas tolaasii에 의해 발생하는 세균갈색무늬병은 버섯재배에서 문제가 되는 대표적인 병해이다. 본 연구에서는 세균갈색무늬병의 생물학적 방제법에 이용할 수 있는 독소저해균의 항균활성과 선발된 독소저해균에 대해 폿트수준의 생물검정 실험을 실시하였다. 재배중인 느타리버섯 폐면배지와 양송이 퇴비에서 세균갈색무늬병원균이 분비하는 독소(tolaasin)를 가장 강하게 억제하는 미생물 HC1를 선발하였으며, 생리 생화학적 실험과 유전적 실험결과 HC1균주는 Pseudomonas sp.로 동정되었다. 생물검정을 위하여 독소분해균 Pseudomonas sp. HC1을 양송이, 팽이, 느타리에 처리한 결과 각각 69%, 68%, 55%의 방제효과를 보였다. 따라서 Pseudomonas sp. HC1이 버섯 세균갈색무늬병 방제를 위해 합성농약을 대체할 수 있는 친환경적인 방제방법이 될 수 있을 것으로 생각된다.

Keywords

References

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