Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Suppression of Citrus Canker by Pretreatment with Rhizobacterial Strains Showing Antibacterial Activity

항균활성 식물근권세균 전 처리에 의한 감귤 궤양병 억제

  • Yang, Ji Seun (Faculty of Bioscience and Industry, Jeju National University) ;
  • Kang, So Young (Faculty of Bioscience and Industry, Jeju National University) ;
  • Jeun, Yong Chull (Faculty of Bioscience and Industry, Jeju National University)
  • 양지순 (제주대학교 생물산업학부) ;
  • 강소영 (제주대학교 생물산업학부) ;
  • 전용철 (제주대학교 생물산업학부)
  • Received : 2014.04.30
  • Accepted : 2014.05.21
  • Published : 2014.06.30
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Abstract

Citrus canker caused by Xanthomonas citri subsp. citri (Xcc) is one of the most important diseases on citrus. Although Satsuma mandarin cultivating mostly in Korea is moderately resistance to canker, occurrence of the disease were more frequently reported since last decade. Like other diseases in citrus, citrus canker was mainly protected by chemical fungicide in the field. Due to the side effect of the chemicals, alternative method of disease control is recently required. In this study four rhizobacterial strains TRH423-3, MRL408-3, THJ609-3 and TRH415-2 are selected by testing its antifungal activity against Xcc. Pre-inoculation with the selected rhizobacterial strains caused disease suppression on the citrus leaves after inoculation with the citrus canker pathogen. Similarly, in the field test symptoms of citrus canker were less developed in the citrus trees applied several times with the selected rhizobacterial strains compared with those of untreated trees. Therefore, it is suggested that the selected rhizobacterial strains may be valuable as an alternative method in the environment-friendly citrus farm.

감귤 궤양병은 Xanthomonas citri subsp. citri (Xcc)에 의해 발생하는 감귤에서 매우 중요한 병 중에 하나이다. 비록 한국에서 대부분 재배되는 감귤인 온주밀감은 감귤 궤양병에 대해 중도저항성이긴 하지만 지난 10년전 이래로 자주 발생되었다. 감귤에서 다른 병과 마찬가지로 감귤 궤양병도 포장에서 주로 화학농약에 의해 방제되고 있다. 농약의 부작용으로 인해 최근 다른 방제 수단이 요구되고 있다. 본 연구에서는 Xcc에 직접적인 항균 활성이 있는 식물근권세균 TRH423-3, MRL408-3, THJ609-3, TRH415-2을 선발하였다. 선발된 식물근권세균을 감귤 잎에 전 처리하였더니 감귤 궤양병균을 접종한 후 병 발생이 억제되었다. 유사하게, 포장 실험에서도 선발된 식물근권세균을 여러 차례 살포한 감귤나무에서 무처리한 나무에 비해 병이 적게 진전 되었다. 따라서 선발된 식물근권세균이 친환경 감귤농가에서 대체 수단으로 가치가 있다고 생각된다.

Keywords

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