한국응용곤충학회지 (Korean journal of applied entomology)

  • 제54권2호
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  • Pages.55-62
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  • 2015
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  • 1225-0171(pISSN)
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  • 2287-545X(eISSN)
한국응용곤충학회 (Korean Society of Applied Entomology)
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Xenorhabuds nematophila 세균 배양액 유래 미확인 생리활성 물질의 비티플러스 살충력 상승효과

Enhancement of Bt-Plus Toxicity by Unidentified Biological Response Modifiers Derived from the Bacterial Culture Broth of Xenornabdus nematiphila

  • 박영진 (안동대학교 자연과학대학 생명자원과학과) ;
  • 김민우 (안동대학교 자연과학대학 생명자원과학과) ;
  • 김건우 (안동대학교 자연과학대학 생명자원과학과) ;
  • 김용균 (안동대학교 자연과학대학 생명자원과학과)
  • Park, Youngjin (Department of Bioresource Sciences, Andong National University) ;
  • Kim, Minwoo (Department of Bioresource Sciences, Andong National University) ;
  • Kim, Kunwoo (Department of Bioresource Sciences, Andong National University) ;
  • Kim, Yonggyun (Department of Bioresource Sciences, Andong National University)
  • 투고 : 2014.12.26
  • 심사 : 2015.04.05
  • 발행 : 2015.06.01
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초록

비티 포자와 Xenorhabdus nematophila (Xn)의 배양액을 혼합하여 비티플러스가 개발되었다. 높은 살충력에도 불구하고 비티플러스는 다양한 해충에 대한 넓은 살충범위를 보이지 않는 한계가 있다. 본 연구에서는 Xn 대사물질 첨가를 통한 파밤나방과 같은 비감수성 해충에 대한 비티플러스의 살충력 향상에 초점을 맞추었다. Xn의 주요 대사물질인 oxindole (OI)과 benzylideneacetone (BZA)는 비티의 살충력을 향상시킨다고 보고되었다. 본 연구에서 OI 또는 BZA의 첨가는 비티플러스의 살충력을 향상시켰다. 그러나 동결건조된 Xn 배양액의 첨가는 보다 낮은 농도의 OI 또는 BZA로도 충분히 비피플러스의 살충력을 상승시켰다. HPLC 분석에서 Xn 배양액에 최소 12개의 대사물질이 포함되어 있는 것을 확인하였다. 이러한 결과는 OI와 BZA 외에도 Xn 대사물질에 생리활성물질이 존재하는 것을 제시한다.

'Bt-Plus' has been developed by mixing spores of Bacillus thuringiensis (Bt) and culture broth of Xenorhabdus nematophila (Xn). Despite its high toxicity, it has some imitation to broaden its efficacy against diverse insect pest spectrum. This study focuses on enhancement of Bt-Plus toxicity against semi-susceptible insect, Spodoptera exitgua, by addition of Xn metabolites. Two main Xn metabolites, oxindole (OI) and benzylideneacetone (BZA), are known to enhance the Bt insecticidal activities. The addition of OI or BZA significantly increased Bt-Plus pathogenicity. However, when the freeze-dried Xn culture broth was added to Bt-Plus, much less amount was enough to enhance the toxicity compared to the amount of OI or BZA. An HPLC analysis indicated that there were more than 12 unidentifed bacterial metabolites in Xn culture broth. These suggest that there are potent biological response modifiers in Xn metabolites other than OI and BZA.

키워드

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