Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Control of the Root-Knot Nematode (Meloidogyne spp.) on Cucumber by a Liquid Bio-Formulation Containing Chitinolytic Bacteria, Chitin and Their Products

키틴분해세균, 키틴 및 그들의 산물이 함유된 미생물제에 의한 오이의 뿌리혹선충(Meloidogyne spp.) 방제

  • Ha, Woo Jong (Department of Plant Biotechnology and Biotechnology Research Institute, Chonnam National University) ;
  • Kim, Young Cheol (Department of Plant Biotechnology and Biotechnology Research Institute, Chonnam National University) ;
  • Jung, Hyuncha (Department of Forest Resources, Sunchon National University) ;
  • Park, Seur Kee (Department of Agricultural Biology, Sunchon National University)
  • 하우종 (전남대학교 식물생명공학부) ;
  • 김영철 (전남대학교 식물생명공학부) ;
  • 정현채 (순천대학교 산림자원학과) ;
  • 박서기 (순천대학교 식물의학과)
  • 투고 : 2014.03.31
  • 심사 : 2014.05.27
  • 발행 : 2014.06.30
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초록

A liquid bio-formulation containing chitinolytic bacteria, chitin and their products was assessed for its potential biological control against root-knot nematodes on cucumber. The bio-formulation was prepared by cultures of three chitinolytic bacteria, Chromobacterium sp. strain C-61, Lysobacter engymogenes and Serratia plymuthica in minimal medium supplemented with chitin. Under pot conditions, the bio-formulation showed better growth of cucumber plants, and less root galls and population density of Meloidogyne spp. than control media without the bio-formulation. In a greenhouse, 75-fold diluted bio-formulations were treated instead of water around cucumber plants through hoses for drip irrigation six times at 5-day intervals from the transplanting date. After 30 and 60 days, the treatment provided about 7% and 10% enhancement in the plant height and about 78% and 69% reduction in population density of Meloidogyne spp. in the rhizosphere, respectively. In addition, the experiments showed that the control effects occurred only in the soils contacted with the bio-formulation. Undiluted bio-formulations were drenched three times at 10-day intervals around cucumber plants severely infested with Meloidogyne spp. The treatment showed about 37% plant enhancement without dead plants compared with 37% death in the untreated control, and about 82% nematode reduction. These results suggest that the bio-formulation can be practically used to control the root-knot nematode on cucumber.

본 연구는 키틴분해세균, 키틴 및 그들의 산물이 함유된 미생물제가 오이의 뿌리혹선충을 어느 정도 방제할 수 있는가를 알아보기 위하여 실시되었다. 미생물제는 3종의 키틴분해세균(Chromobacterium sp. C-61, Lysobacter engymogenes 및 Serratia plymuthica)을 키틴 + 최소기본배지에서 배양함으로서 조제되었다. 포트 조건에서 미생물제는 대조구에 비하여 오이의 생육을 증진시키고, 뿌리혹과 뿌리혹선충의 밀도를 감소시켰다. 비닐하우스에서 정식한 날부터 물 대신에 75배 희석된 미생물제를 5일 간격으로 6회 오이에 점적 관수하면, 30일 후 오이의 초장이 7% 증가하고 근권의 뿌리혹선충 밀도는 78% 감소되며, 60일 후에는 10%의 초장 증가와 69%의 밀도 감소를 나타냈다. 아울러, 이러한 효과는 미생물제가 직접 접촉된 부분에서만 일어났다. 한편, 뿌리혹선충에 심하게 감염되어 생육이 저조한 오이에 미생물제 원액을 10일 간격 3회 토양 관주하였을 경우에는 무처리구에서 37%의 오이가 죽었지만 처리구에서는 한 주도 죽지 않고, 37%의 생육 증가와 82%의 선충 감소를 보여 주었다. 따라서 본 미생물제는 오이 뿌리혹선충의 방제에 활용 가능하리라 판단되었다.

키워드

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