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독도 주변의 해수에서 분리한 세균의 다양성과 군집구조 분석

Bacterial Diversity and Distribution of Cultivable Bacteria Isolated from Dokdo Island.

김사열|성혜리
한국미생물·생명공학회 (The Korean Society For Microbiology And Biotechnology)|2010.09|한국미생물·생명공학회지 (Microbiology and Biotechnology Letters)|제38권 제3호|pp. 263-272

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참고문헌

키워드

Dokdosea waterbacterial diversityproteobacteriabacteriodetes
주제분류생물학

초록

독도 연안에 존재하는 배양 가능한 미생물의 다양성을 16S rRNA 분석으로 조사하였다. 동도 선착장 주변과 서도 숙소부근을 중심으로 채취한 시료에서 163개의 해양 미생물을분리하였다. 분리한 미생물 163종을 16S rRNA 염기서열의 분석을 이용하여 부분동정 할 수 있었다. 부분동정된 미생물은 gamma-proteobacteria(58%), alpha-proteobacteria (20%), bacteriodetes(16%) 계통이 대부분을 차지하고 있었고, 그 외에도 low G+C Gram positive bacteria와 epsilonproteobacteria가소수 동정 되었다. 염기서열이 분석된 미생물들은 이전에 보고된 미생물들의 16S rRNA 유전자와93.3%에서 100%의 유사도를 보이며 56속 94종으로 부분 동정되었다. 163종의 부분 동정된 미생물 중 36개의 분리 미생물이 새로운 종으로 분류될 후보군으로 추정되었다. 본 연구의 결과 독도연안 바닷물에는 proteobacteria와 bacteriodetes의비율이 높게 나타났고, 미생물 다양성을 높게 유지하고 있었다. 이 다양한 미생물로부터 다양한 유용미생물 자원을 확보할 수 있고, 새로운 종으로 분류될 후보군 들은 추후 여러 생리생화학적 실험을 수행하여 새로운 종 또는 새로운 속으로 발표할 수 있을 것으로 판단된다.

Abstract

One hundred sixty three strains showing different colony morphological characteristics on different concentration of marine agar (MA) plates were isolated from ambient seawater near Dokdo island. Bacterial diversity and distributions were studied by phylogenetic analysis of the partial 16S rRNA gene sequences. One hundred sixty three strains were partially sequenced and analyzed phylogenetically. They were composed of 5 phyla, of which gamma-proteobacteria (58%),alpha-proteobacteria (20%), bacteriodetes (16%) were predominant. They were affiliated with 90 species. The 16S rRNA sequence similarity of the isolates was in 93.3 to 100 % range to reported sequence data. Thirty six isolates of among them were assumed to be novel species candidates based on similarity analysis of the 16S rRNA gene sequences. Overall, Proteobacteria and Bacteriodetes of the Dokdo coastal sea water showed a high diversity.

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