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패류(Scapharca broughtonii) 유래의 용혈활성 미생물 다양성 분석

Analysis of Hemolytic Microflora from the Ark Shell (Scapharca broughtonii)

  • 김동균 (국립수산과학원 전략양식연구소 생명공학과) ;
  • 남보혜 (국립수산과학원 전략양식연구소 생명공학과) ;
  • 공희정 (국립수산과학원 전략양식연구소 생명공학과) ;
  • 김우진 (국립수산과학원 전략양식연구소 생명공학과) ;
  • 김봉석 (국립수산과학원 전략양식연구소 생명공학과) ;
  • 지영주 (국립수산과학원 전략양식연구소 생명공학과) ;
  • 이상준 (국립수산과학원 전략양식연구소 생명공학과) ;
  • 정춘구 (국립수산과학원 남동해수산연구소) ;
  • 공미선 (국립수산과학원 전략양식연구소 생명공학과) ;
  • 김영옥 (국립수산과학원 전략양식연구소 생명공학과)
  • 투고 : 2012.03.06
  • 심사 : 2012.04.04
  • 발행 : 2012.05.30

초록

남해연안지역은 피조개($Scapharca$ $broughtonii$) 양식으로 매우 중요한 지역이나 최근 대량폐사로 인하여 생산량이 급격히 감소하였다. 이러한 대량폐사의 원인을 구명하기 위하여 다양한 환경요인들에 대한 연구는 수행되었으나, 미생물학적인 연구는 미비한 실정이다. 본 연구에서는 폐사율이 높은 강진만과 폐사발생이 적은 진해만 연안 피조개 양식장의 해저 퇴적물과 피조개 체내에서 분리한 미생물 균총에 대하여 분석하였다. 각각의 샘플에서 배양 가능한 모든 미생물을 분리하였으며, 분리한 미생물 중 알파 또는 베타 용혈활성을 보이는 미생물을 모두 동정하였다. 피조개 체내에 존재하는 용혈미생물의 균총은 해저 퇴적물 보다 낮은 다양성을 보였으며, 극히 한정된 종의 미생물이 존재함을 알 수 있었다. 강진만에서는 17속(genus) 88종(species)의 미생물을, 그리고 진해만에서는 16속 64종의 미생물을 분리할 수 있었다. 샘플 내에는 $Bacillus$ 속의 미생물이 가장 많이 분리 되었으며, 그 중 $Bacillus$ cereus group의 종이 가장 많고, $Paenibacillus$, $Lynsilbacillus$, 그리고 $Vibrio$ 종 등이 그 다음으로 많이 존재하였다. 속(genus) 수준에서는 두 지역의 특별한 차이를 발견할 수 없었으나, 진해만 연안에서는 64종이 발견되었고 강진만에서는 88종이 분리되어, 강진만이 좀 더 종 수준에서의 높은 다양성을 알 수 있었다. 따라서 피조개 대량폐사의 원인은 이러한 균주의 종 수준에서의 차이에서 기인하는 것 이라고 가정할 수 있었으며, 폐사지역에서 발견되는 미생물을 이용한 감염실험을 통하여 피조개의 대량폐사 원인 균을 구명 할 예정이다.

The southern coast of Korea is important for the ark shell ($Scapharca$ $broughtonii$) aquaculture, but the productivity was rapidly reduced during the previous decade by mass mortality. To overcome this economic loss, investigations only focused on environmental factors, and microbiological researches were performed insufficiently. In this study, two sites (Gangjin and Jinhae bay) were selected for their high and low rate of mortality, respectively, and the existence of microflora from underwater sediments in the bodies of $S.$ $broughtonii$ was analyzed. We screened the whole body of each sample and chose unique colonies, which exhibit alpha- and beta-hemolytic activity, for identification. The microflora in $S.$ $broughtonii$ was less variable than sediments, and restricted species were isolated. We identified 17 genera of 88 species and 16 genera of 64 species from the two bays, respectively. A major proportion was comprised of $Bacillus$ species, with the $Bacillus$ $cereus$ group being the most common species among the $Bacillus$ strains, while $Paenibacillus$, $Lynsilbacillus$, and $Vibrio$ species were the second most abundant species. At the genus level, there were no significant microbial differences between the two coastal regions. 64 species were isolated from rare site (Jinhae bay), but more species (88) with greater variety were isolated from the frequent site (Gangjin bay). Therefore, it was assumed that the cause of mass mortality lay in the difference in specie-level diversity, and conducting investigations on the diagnosis of pathogenic species by challenging tests using isolated unique species.

키워드

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  1. Analysis of diversity of hemolytic microbiome from aquafarm of arkshell, Scapharca broughtonii vol.26, pp.3, 2013, https://doi.org/10.7847/jfp.2013.26.3.193
  2. Antibacterial Activity of Bacteria Isolated from Rocks on the Seashore vol.48, pp.6, 2015, https://doi.org/10.5657/KFAS.2015.0904
  3. Transcriptome Analysis Revealed Changes of Multiple Genes Involved in Haliotis discus hannai Innate Immunity during Vibrio parahemolyticus Infection vol.11, pp.4, 2016, https://doi.org/10.1371/journal.pone.0153474