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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

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.

Acknowledgement

Grant : 화학농약 대체기술

Supported by : 농촌진흥청

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