Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Nematode-Trapping Fungi Showed Different Predacity among Nematode Species

선충 종류별 4종 포식성곰팡이의 포식력 차이

  • Kang, Heonil (Plant Bioscience, College of Natural Resources and Life Science, Pusan National University) ;
  • Choi, Insoo (Plant Bioscience, College of Natural Resources and Life Science, Pusan National University) ;
  • Park, Namsook (Nematode Research Center, Life and Industry Convergence Research Institute, Pusan National University) ;
  • Bae, Changhwan (Biological and Genetic Resources Assessment Division, National Institute of Biological Resources) ;
  • Kim, Donggeun (Nematode Research Center, Life and Industry Convergence Research Institute, Pusan National University)
  • 강헌일 (부산대학교생명자원과학대학 식물생명과학과) ;
  • 최인수 (부산대학교생명자원과학대학 식물생명과학과) ;
  • 박남숙 (부산대학교생명자원과학대학 선충연구센터) ;
  • 배창환 (환경부 국립생물자원관 생물자원활용부) ;
  • 김동근 (부산대학교생명자원과학대학 선충연구센터)
  • Received : 2019.05.01
  • Accepted : 2019.08.16
  • Published : 2019.09.30
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Abstract

Nematode-trapping fungi develop trap and consume nematodes are an important part of the subsoil ecosystem and they share a special predator-prey relationship. Four nematode-trapping species, there with adhesive network, Arthrobotrys oligospora, A. sinensis, A. thaumasia and one with constricting ring, Drechslerella brochopaga were collected from soils in Korea and tested their predacity against 12 different nematode species. They were three feeding groups, plant-parasitic (Meloidogyne incognita and Pratylenchus penetrans), fungivorous (Aphelenchus avenae), bacteriovorous (Betlerius sp. and Diplogasteritus sp. in diplogasterid, Panagrolaimus labiatus, P. multidentatus in panagrolaimid, Mesorhabditis irregularis, Pelodera strongyloides and Rhabditis sp., in rhabditid, and Acrobeloides sp. in cephalobid). Results showed that nematode-trapping fungi successfully captured most of nematodes in Petri dish in the group of plant-parasitic nematodes and rhabditids, moderately and variably in other nematodes in 15 days. But it didn't captured A. avenae and Acrobeloides sp. both belongs to c-p group 2. Numbers of Acrobeloides sp. and A. avenae even increased during the test period. The results of this study indicated that nematode-trapping fungi may have specificity among nematode species.

선충 포식성곰팡이는 유기물에서 번식하다가 양분이 부족해지면 특수 기관을 형성하여 선충을 포획하고 선충으로부터 양분을 섭취하기 때문에 토양 내 동물계와 먹이사슬을 이루며 생태계에서 중요한 부분을 차지한다. 본 연구에서는 끈끈이그물형 포식기관을 가진 3종, Arthrobotrys oligospora, A. sinensis, A. thaumasia과 수축성올가미형 포식기관을 가진 Drechslerella brochopaga 1종 등 4종의 선충 포식성곰팡이의 식세균성선충 9종, 식균성선충 1종, 식물기생성선충 2종 등 총 12종의 선충류에 대한 포식력을 검정하였다. 4종의 포식성곰팡이에 모두 감수성인 선충은 식물기생성선충 2종류(Meloidogyne incognita, Pratylenchus penetrans), Rhabditidae에 속하는 P. strongyloides, Mesorhabditis irregularis이었고 접종 4일 후부터 선충을 포식하였으며, 선충 내부로 곰팡이가 번식하여 15일째에는 거의 선충의 형태를 알아볼 수 없을 정도였다. 반면, Cephlobidae에 속하는 Acrobeloides spp., A. avenae는 4종의 포식성곰팡이에 모두 저항성을 보였으며 15일 후 관찰하였을 때, 접종배지 내에 선충 수가 초기접종 밀도와 같거나 오히려 2-3배 정도까지 번식되었다. 나머지 선충 종들은 포식성곰팡이 종류에 따라 감수성에 다소간 차이가 있었다. 본 연구결과, 선충 포식성곰팡이가 선충 종에 따라 특이적으로 반응하였으며 이러한 기주특이성을 이용하여 식물기생성선충의 친환경적 방제를 위한 하나의 수단으로 이용될 수 있다.

Keywords

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