생명과학회지 (Journal of Life Science)

  • 제17권11호
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  • Pages.1453-1463
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  • 2007
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
권호 표지
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어류치사성 Cochlodinium polykrikoides 적조생물의 유전적 진화 및 특성

Genetic Evolution and Characteristics of Ichthyotoxic Cochlodinium polykrikoides(Gymnodiniales, Dinophyceae)

  • 조은섭 (국립수산과학원 남해수산연구소) ;
  • 정창수 (국립수산과학원 남해수산연구소)
  • 발행 : 2007.11.30
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초록

본 연구는 유해성 적조생물인 Cochlodinium polykrikoides의 유전적 계통진화를 설명하기 위하여 24 종의 개체에 대한 SSU을 대상으로 분석했다. C. polykrikoides는 와편모조류와 밀접한 단일 계통군을 형성하고 있다. Neighbor-joining 혹은 parsimony 분석에 의하면 C. polykrikoides는 Gymnodiniales 보다 Prorocentrals 목 (order)에 훨씬 근접한 100% 유연관계를 보이고 있으며, 과 (family)로 분석해 보면 Gymnodiniaceae에 속해 있고, 특히 Prorocentrum micans와는 매우 밀접한 관계를 보이고 있다. 형태적으로는 Gyrodinium속 (genus)에 가깝지만, 유전적으로는 Gymnodinium 속에 근접하고 있다. C. polykrikoides는 와편모조류 중에서 독립적인 계통군을 유지하고 있다. 따라서 p. micans는 Gymnodinium의 조상으로 추측되며, C. polykrikoides는 P. micans와 Gymnodinium 속의 중간단계인 것으로 보인다.

This study presents a molecular phylogenetic analysis of the harmful dinoflagellate Cochlodinium polykrikoides, by use of partial sequence of small subunit (SSU) rRNA gene from most of the major taxa(24 species) in dinoflagellates. The class Dinophyceae clade formed a strong monophyletic relationship with C. polykrikoides and several taxa. On the basis of deeper nodes, the phylogenetic relationships placed C. polykrikoides closer to the order Prorocentrales rather than to the order Gymnodiniales, which was supported by a strong bootstrap value (100%) in the analyses of Neighbor-Joining and Parsimony methods. There is strong support for C. polykrikoides being placed in the same branch as Gymnodiniaceae and being connected in a clade with Prororcentrum micans among Prorocentrales. Morphological data show that C. polykrikoides is well associated with the genus Gyrodinium; however, this species is genetically closer to Gymnodinium than to Gyrodinium. The placement of C. polykrikoides always formed an independent branch separated from other dinoflagellates. In conclusion, planktonic P. micans plays an important role as an ancestor of Gymnodinium, whereas C. polykrikoides appears to be used an intermediate position between P. micans and Gymnodinium based on evolution.

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