Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Identification of an Entomopathogenic Bacterium, Serratia sp. ANU101, and Its Hemolytic Activity

  • Kim, Yong-Gyun (Department of Bioresource Sciences, Andong National University) ;
  • Kim, Keun-Seob (Department of Bioresource Sciences, Andong National University) ;
  • Seo, Ji-Ae (Department of Bioresource Sciences, Andong National University) ;
  • Shrestha, Sony (Department of Bioresource Sciences, Andong National University) ;
  • Kim, Hosanna-H. (Kyungbuk Science High School) ;
  • Nalini, Madanagopal (Department of Bioresource Sciences, Andong National University) ;
  • Yi, Young-Keun (Department of Bioresource Sciences, Andong National University)
  • Received : 2008.06.11
  • Accepted : 2008.07.30
  • Published : 2009.03.31
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Abstract

Four different bacterial colonies were isolated from an old stock of an entomopathogenic nematode, Steinernema monticolum. They all showed entomopathogenicity to final instar larvae of beet armyworm, Spodoptera exigua, by hemocoelic injection. However, they varied in colony form, susceptibility to antibiotics, and postmortem change of the infected host insects. Biolog microbial identification and 16S rDNA sequence analyses indicate that these are four different species classified into different bacterial genera. Owing to high entomopathogenicity and a cadaver color of infected insect host, Serratia sp. was selected as a main symbiotic bacterial species and analyzed for its pathogenicity. Although no virulence of Serratia sp. was detected at oral administration, the bacteria gave significant synergistic pathogenicity to fifth instar S. exigua when it was treated along with a spore-forming entomopathogenic bacterium, Bacillus thuringiensis. The synergistic effect was explained by an immunosuppressive effect of Serratia sp. by its high cytotoxic effect on hemocytes of S. exigua, because Serratia sp. caused septicemia of S. exigua when the bacterial cells were injected into S. exigua hemocoel. The cytotoxic factor(s) was present in the culture medium because the sterilized culture broth possessed high potency in the cytotoxicity, which was specific to granular cells and plasmatocytes, two main immune-associated hemocytes in insects.

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