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Molecular Identification of the Bloom-forming Cyanobacterium Anabaena from North Han River System in Summer 2012

북한강 수계 조류대발생 원인종 남조 Anabaena의 분자계통학적 검토

  • Li, Zhun (Department of Life Science, Hanyang University) ;
  • Han, Myung-Soo (Department of Life Science, Hanyang University) ;
  • Hwang, Su-Ok (K-waters, Korea Water Resources Corporation) ;
  • Byeon, Myeong-Seop (Han River Environment Research Center, National Institute of Environmental Research) ;
  • Hwang, Soon-Jin (Department of Environmental Science, Konkuk University) ;
  • Kim, Baik-Ho (Department of Life Science, Hanyang University)
  • Received : 2013.04.01
  • Accepted : 2013.06.19
  • Published : 2013.06.30

Abstract

Between May and August 2012, a massive cyanobacterial bloom with Anabaena has been occurred throughout the North Han River. Sampling was conducted at one station on each lake, L. Uham, L. Cheongpyung, and L. Paldang, where occurred a dense bloom, in 13 July. According to the microscopic examination, the blooms was dominated by one specific filamentous cyanobacterium Anabaena and other phytoplankton. Morphologically, previous literature proven that this Anabaena species is A. crassa (Lemmermann) Komark.-Legn. & Cronberg. However, identification of species in a mixed population is complicated due to limited morphological differences. Therefore, with live sample including trichome, akinete and heterocyst, the sequences of 16S rRNA gene of Anabaena isolates were cloned and analyzed, and three 16S rRNA gene sequences of 1188~1520 bp in length were obtained. It was shown from the homologous analysis results that the obtained 16S rRNA sequences were highly homologous to the relevant sequences of A. crassa in GenBank. The 16S rRNA sequences of 63 species were retrieved from GenBank, and the phylogenetic tree was constructed by using these sequences.

2012년 북한강수계 전역에 걸쳐 대발생을 일으킨 남조 Anabaena의 분자생물학적 특성을 검토하였다. 시료는 2012년 7월 13일에 남조 Anabaena 밀도가 높았던 3개 호소- 의암호, 청평호, 팔당호에서 각각 채집하였다. 분석은 선행연구 문헌을 근거로 하는 형태학적 분석, 16S rRNA 염기서열 분석을 통한 분자계통학적 분석을 동시에 실시하였다. 결과를 종합하면 북한강수계 3개 호소에서 조류 대발생을 일으킨 남조 Anabaena는 모두 동일종 Anabaena crassa (Lemmermann) Komark.-Legn. & Cronberg이며, 동시에 출현하고 본 종과 형태 및 분자생물학적으로 매우 유사한 A. circinalis는 환경요인에 따라 형태변이가 쉽게 일으키는 동일종으로 밝혀졌다.

Keywords

References

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