Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Suppression of Citrus Melanose on the Leaves Treated with Rhizobacterial Strains after Inoculation with Diaporthe citri

식물근권세균 처리에 의한 감귤 검은점무늬병에 대한 방제 효과

  • Ko, Yun Jung (Major of Plant Resources & Environment, College of Applied Life Sciences, The Research Institute for Subtropical Agriculture and Biotechnology, Jeju National University) ;
  • Kang, So Young (Major of Plant Resources & Environment, College of Applied Life Sciences, The Research Institute for Subtropical Agriculture and Biotechnology, Jeju National University) ;
  • Jeun, Yong Chull (Major of Plant Resources & Environment, College of Applied Life Sciences, The Research Institute for Subtropical Agriculture and Biotechnology, Jeju National University)
  • 고윤정 (제주대학교 식물자원환경전공) ;
  • 강소영 (제주대학교 식물자원환경전공) ;
  • 전용철 (제주대학교 식물자원환경전공)
  • Received : 2012.08.28
  • Accepted : 2012.11.16
  • Published : 2012.12.31
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Abstract

Citrus melanose is one of important disease in citrus cultivation, reducing quality of citrus fruits and resulting in economic loss. Like other diseases in citrus, melanose was mainly protected by chemical fungicide in the field. Recently, alternative method of disease control is highly required due to the side effect of the chemicals. In this study four rhizobacterial strains TRH423-3, MRL408-3, THJ609-3, and TRH415-2 are selected by dual-culture testing its antifungal activity against Diaporthe citri causing citrus melanose. To investigate the protection efficacy of the selected rhizobacterial strains to citrus melanose, the bacteria were pre-treated on citrus leaves following inoculation with melanose pathogen. Pre-treatment with all selected rhizobacterial strains showed disease suppression in which the levels of protection rates were different by the rhizobacterial strains. Additional treatment with the rhizobacterial strains after the pathogen inoculation enhanced protection rates in all cases. The strain MRL408-3 and TRH423-3 were identified as Burkholderia gladioli, TRH415-2 as Pseudomons fluorescens and THJ609-3 as Pseudomonas pudia as a result of analyzing the internal transcript spaces of the rhizobacterial strains rDNA. The selected rhizobacterial strains may be valuable as biological control agents in the environment-friendly citrus farm in which chemical application is limited.

감귤 검은점무늬병은 감귤 재배에 있어서 매우 중요한 병으로 감귤의 상품 가치를 떨어뜨리고 경제적 손실을 유발한다. 다른 감귤병과 마찬가지로 감귤 검은점무늬병 방제에는 주로 화학 농약이 사용된다. 최근 농약의 부작용 때문에 농약을 대체할 수 있는 방제 수단이 절실히 요구되고 있다. 본 연구에서는 감귤 검은점무늬병균 Diaporthe citri에 항균효과가 있는 식물근권세균 TRH423-3, MRL408-3, THJ609-3, TRH415-2을 선발하였다. 이들 세균의 감귤 검은점무늬병에 방제 효과가 있는지 알아보기 위해 감귤 잎에 전 접종한 후 감귤 검은점무늬병균을 접종하였다. 선발된 모든 식물근권세균이 감귤 검은점무늬병에 대해 방제 효과를 나타내었고 방제 정도는 식물근권세균의 균주에 따라 차이가 있었다. 감귤 검은점무늬병균을 접종한 후 추가로 식물근권세균을 접종하였더니 모든 처리구에서 방제 효과가 증진되었다. 한편, 식물근권세균 rDNA의 internal transcript spaces 염기서열을 분석한 결과 MRL408-3와 TRH423-3은 Burkholderia gladioli로, TRH415-2은 Pseudomons fluorescens로 그리고 THJ609-3은 Pseudomonas pudia로 동정되었다. 이들 선발된 식물근권세균은 화학적 방제 수단의 적용이 제한된 친환경 감귤 재배지에서 가치 있게 사용될 수 있을 것으로 판단된다.

Keywords

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