생명과학회지 (Journal of Life Science)

  • 제23권6호
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  • Pages.770-778
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  • 2013
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
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Amplified Ribosomal DNA Restriction Analysis를 이용한 광양만 해수의 세균 군집의 계절적 변화

Seasonal Variation of Bacterial Community in the Seawater of Gwangyang Bay Estimated by Amplified Ribosomal DNA Restriction Analysis

  • 투고 : 2013.03.15
  • 심사 : 2013.06.27
  • 발행 : 2013.06.30
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초록

본 연구에서는 광양만 해수의 세균군집 다양성의 계절적인 변화를 분석하기 위해 2011년 2월, 5월, 7월, 10월의 4계절에 총 336 균주를 분리하였다. 분리된 미생물의 16S rRNA를 제한효소 Hae III를 이용하여 Amplified Ribosomal DNA Restriction Analysis 를 실시하여 절편 양상을 군집화 시키고, 다양성 지수를 계산하였다. 80%의 유사도 수준에서 40개의 단일 계통형을 포함한 총 101개의 계통형을 얻을 수 있었다. 각 계통형을 대표할 수 있는 139개 균주를 선택하여 16S rRNA 염기서열을 결정한 후 유전자서열을 비교한 결과, 이들 균주는 Proteobacteria, Actinobacteria, Bacteroidetes 및 Firmicutes를 포함한 4개의 문에 속하였다. 모든 계절에 Proteobacteria 문이 최 우점하였고, 겨울과 봄, 가을에는 Bacteroidetes 문, 여름에는 Actinobacteria 문이 차 우점하였다. 과(family) 수준에서는 겨울과 봄에는 Flavobacteriaceae가 우점하였고, 여름과 가을에는 Pseudoalteromonadaceae가 우점하였다. 모든 계절에 Altererythrobacter, Loktanella, Pseudoalteromonas, Vibrio 속(genus)이 관찰되었다. 미생물 군집의 다양성은 가을에 가장 높았으며, 다음으로 봄, 겨울, 여름 순서였다.

To determine the seasonal variation of bacterial community in the seawater of Gwangyang Bay, three hundred thirty six bacterial strains were isolated on February, May, July and October 2011. Amplified Ribosomal DNA Restriction Analysis (ARDRA) was used to construct the phylotyes of the isolates using the restriction endonuclease, Hae III. Diversity indices of ARDRA patterns were calculated. One hundred and one phylotypes including 40 unique pylotypes were found at the 80% similarity level. Partial 16S rRNA genes of one hundred thirty nine strains representing each phylotypes were sequenced and compared. Bacterial community composed of 4 different phyla which include Proteobacteria, Actinobacteria, Bacteroidetes and Firmicutes. Proteobacteria was the prevailing phylum in all seasons, followed by Bacteroidetes in winter, spring and autumn while Actinobacteria in summer. At the family level, Flavobacteriaceae dominated in winter and spring and Pseudoalteromonadaceae did in summer and autumn. Genera Altererythrobacter, Loktanella, Pseudoalteromonas and Vibrio were encountered in all seasons. The most diverse bacterial community was found in autumn followed by the order of spring, winter and summer.

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