Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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Identification and Physiological Characters of Intestinal Bacteria of the Black Soldier Fly, Hermetia illucens

아메리카동애등에 장내세균 동정과 생리적 특징

  • Kim, Eunsung (Department of Bioresource Sciences, Andong National University) ;
  • Park, Jiyeong (Department of Bioresource Sciences, Andong National University) ;
  • Lee, Sanghoon (GreenTeko, Inc.) ;
  • Kim, Yonggyun (Department of Bioresource Sciences, Andong National University)
  • 김은성 (안동대학교 자연과학대학 생명자원과학과) ;
  • 박지영 (안동대학교 자연과학대학 생명자원과학과) ;
  • 이상훈 ((주)그린테코) ;
  • 김용균 (안동대학교 자연과학대학 생명자원과학과)
  • Received : 2013.07.17
  • Accepted : 2013.10.04
  • Published : 2014.03.01
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Abstract

The black soldier fly, Hermetia illucens, larvae may depend on indigenous bacteria in the intestine to feed and digest diverse food sources. To prove this hypothesis, we isolated and identified the intestinal bacteria of the black soldier fly for their digestive and antimicrobial abilities. The last instar larvae had long digestive tracts, which were about seven times longer than its body length. An individual of H. illucens larvae possessed a total of $5.0{\pm}10^6$ bacteria in the whole intestine, of which more than 98% bacteria were located in the hindgut. Three different bacterial isolates cultured on nutrient agar (NA) medium were detected in the intestine and identified as Morganella morganii, Providencia rettgeri and Bacillus halodurans by Biolog microbial identification system. Analysis of 16S rDNA sequences of the intestinal bacteria detected the additional bacteria of Proteus mirabilis, Providencia alcalifaciens, and Providencia sp. These intestinal bacteria cultured on NA medium exhibited high resistance to 4 antibiotics and inhibited growth of other microbes which are mainly plant pathogens. Also, these bacteria exhibited catalytic activities to degrade cellulose, lipid, proteins, and carbohydrates. These results suggest that H. illucens larvae possess intestinal bacteria that may play crucial roles in their digestive physiology.

다양한 먹이 조건에서 생활하는 아메리카동애등에(Hermetia illucens)는 장내 세균의 의존성을 가질 수 있다. 이 가설을 증명하기 위해 본 연구는 종령 유충의 소화관에 존재하는 세균을 분리, 동정하고 효소활성 및 항균 능력을 분석하였다. 종령 유충의 소화관은 몸 체장에 약 7 배의 길이를 나타냈다. 한 개체의 소화관 내 존재하는 세균 수는 $5.0{\times}10^6$ cfu로 98% 이상이 후장에 존재했다. 소화관에는 3 종류의 상이한 세균이 존재했고, 미생물 동정 장치는 이들이 각각 Morganella morganii, Providencia rettgeri 및 Bacillus halodurans로 동정하였다. 이들 소화관 세균을 16S rDNA 서열을 분석한 결과 이 외에 Proteus mirabilis, Providencia alcalifaciens, Providencia sp.를 검출하였다. 이들 장내세균은 항생제 내성을 보였고, 타 미생물의 성장을 억제하였다. 또한 섬유소, 지질, 단백질 및 탄수화물의 분해 능력을 보유하였다. 본 연구 결과들은 아메리카동애등에 소화관에 유용성이 높은 세균을 보유하고 있다고 제시하였다.

Keywords

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