Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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Antibiotic and Insecticidal Activities of Metabolites Derived From an Entomopathogenic Bacterium, Xenorhabdus nematophila, Against The Bean Bug, Riptortus clavatus

곤충병원세균(Xenorhabdus nematophila) 유래물질의 톱다리개미허리노린재(Riptortus clavatus) 장내세균 증식억제 및 살충효과

  • Seo, Sam-Yeol (Department of Bioresource Sciences, Andong National University) ;
  • Kim, Yong-Gyun (Department of Bioresource Sciences, Andong National University)
  • 서삼열 (안동대학교 자연과학대학 생명자원과학과) ;
  • 김용균 (안동대학교 자연과학대학 생명자원과학과)
  • Received : 2010.08.17
  • Accepted : 2010.09.06
  • Published : 2010.09.30
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Abstract

A bacterial colony was isolated from the gut of the bean bug, Riptortus clavatus. From morphological and biochemical tests, the bacterial isolate showed the highest similarity to Staphylococcus succinus. DNA sequence of 16S rRNA gene of the bacterium supported the identification. Oral administration of penicillin G to adults of R. clavatus gave a dose-dependent mortality of adults of R. clavatus to adults along with significant decrease of the bacterial population in the gut. Similarly, three metabolites (benzylideneacetone, proline-tyrosine, and acetylated phenylalanine-glycine-valine) derived from an entomopathogenic bacterium, Xenorhabdus nematophila, also inhibited growth of the gut bacterial population and gave significant mortalities to R. clavatus. These results suggest that a gut bacterial population classified as Staphylococcus sp. is required for survival of R. clavatus and that the three bacterial metabolites had toxic effects on the bugs due to their antibacterial properties.

톱다리개미허리노린재(Riptortus clavatus)의 장내세균이 분리되었다. 형태학적 분석과 생화학적 분석을 통하여 세균이 Staphylococcus succinus와 가장 유사한 것으로 동정되었다. 16S rRNA 유전자의 염기서열은 이러한 동정 결과를 뒷받침했다. 페니실린G를 톱다리개미허리노린재 성충에게 경구투여 하였을 때 장내세균 밀도 감소와 치사 효과를 유발하였다. 동일한 방법으로 곤충병원세균(Xenorhabdus nematophila)의 세 가지 대사물질(benzylideneacetone, proline-tyrosine, and acetylated phenylalanine-glycine-valine)을 처리하였을 때, 톱다리개미허리노린재 장내세균의 밀도감소와 치사효과를 확인하였다. 이러한 결과는 톱다리개미허리노린재의 장내세균이 Staphylococcus sp.이며, 곤충병원세균 대사물질의 항균 활성이 장내세균과 궁극적으로 톱다리개미허리노린재의 생존에 영향을 미친다는 것을 제시하였다.

Keywords

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