Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Isolation of Bacteria Associated with Fresh Sponges in Lake Baikal

바이칼 호수에 서식하는 담수 스폰지 내 공생세균의 분리

  • Cho, Ahn-Na (Division of Life Sciences, Korea Polar Research Institute) ;
  • Kim, Ju-Young (Department of Environmental Science, Kagnwon Natioal University) ;
  • Ahn, Tae-Seok (Department of Environmental Science, Kagnwon Natioal University)
  • Received : 2013.08.02
  • Accepted : 2013.10.31
  • Published : 2014.02.28
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Abstract

Sponge in Lake Baikal is an unique organism. Microorganisms in sponges are assumed as precious resources for bioactive materials. For understanding the bacterial community in Baikalian sponges by cultivation, 92 strains of bacteria were isolated from lake water and 2 species of sponges, Baikalospongia sp. and Lubomirskia sp., Thirty five bacterial strains are isolated from ambient water near the sponge, 27 bacterial strains from Baikalospongia sp., 30 bacterial strains from Lubomirskia sp.. As a result, 78.3% and 57.6% of isolated bacterial strains has amylase and protease activity respectively, while strains with cellulose and lipase activities were 38.0% and 34.8%. By 16S rRNA sequence analysis of selected strains, 13 strains which were isolated from Baikalospongia sp. were belong to Pseudomonas spp.. Whereas, 14 strains which were isolated from Lubomirskia sp. were Pseudomonas spp., Buttiauxella agrestis, Pseudomonas fluorescens, Yersinia ruckeri, Bacillus spp., Paenibacillus spp., Bacillus thuringiensis, Bacillus simplex, Brevibacterium spp., Acinetobacter lwoffii. In culture media, Pseudomonas spp. dominance was supposed that according to allelophathy.

바이칼호에 서식하는 2종의 스폰지 체내 및 주변 물로부터 92개의 저온성 균주를 분리하고 각 균주들의 기질 분해능을 조사하였다. 그 결과 섬유소와 지방에 대한 분해 활성도를 갖는 균주는 38.0, 34.8%로 비교적 적었으나 전분과 단백질 분해 활성도를 갖는 균주는 78.3, 57.6%로 높은 비율로 나타났다. 분리한 세균을 염기서열의 유사도에 따라 분류하기 위하여 Genomic Fingerprinting을 실시한 후 31개 균주를 선별하여 동정한 결과, Baikalospongia sp.에서 분리한 13균주는 모두 Pseudomonas속으로 확인된 반면, Lubomirskia sp.에서 분리한 14균주는 Pseudomonas ssp., Buttiauxella agrestis, Pseudomonas fluorescens, Yersinia ruckeri, Bacillus ssp., Paenibacillus ssp., Bacillus thuringiensis, Bacillus simplex, Brevibacterium ssp., Acinetobacter lwoffii로 다양하게 동정되었다. 그러나 총 31개 균주 중 18개가 Pseudomonas속으로 동정된 것은 타감작용에 의한 다른 세균 성장의 방해 때문으로 평가되며, 이러한 일반적인 배양 방법의 한계점을 극복하기 위해서는 스폰지의 서식처와 세균의 검출 방법에 대하여 보다 다양한 심층적인 연구가 이루어져야 할 것으로 생각된다.

Keywords

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