Korean Journal of Plant Taxonomy (식물분류학회지)

The Korean Society of Plant Taxonomists (한국식물분류학회)
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Phylogeny of Korean Viola based on ITS sequences

ITS 염기서열에 의한 한국산 제비꽃속(Viola)의 계통 유연관계

  • Yoo, Ki-Oug (Division of Life Sciences, Kangwon National University) ;
  • Jang, Su-Kil (Division of Life Sciences, Kangwon National University) ;
  • Lee, Woo-Tchul (Division of Life Sciences, Kangwon National University)
  • 유기억 (강원대학교 자연과학대학 생명과학부) ;
  • 장수길 (강원대학교 자연과학대학 생명과학부) ;
  • 이우철 (강원대학교 자연과학대학 생명과학부)
  • Received : 2004.12.30
  • Accepted : 2005.01.29
  • Published : 2005.03.30
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Abstract

Molecular phylogenetic studies were conducted to evaluate interspecific relationships in 40 populations of Viola including 35 Korean taxa, four Japanese populations and one outgroup using nuclear ribosomal ITS sequences. The phylogenetic analyses were conducted using parsimony and neighbor-joining methods. Subsection Trigonocarpae of section Nomimium appeared as the most basal clade within the Korean Viola. Section Dischidium and Chamaemelanium was monophyletidbootstrap 100%) and placed between subsect. Trigonocarpae and three other subsections of sect. Nomimium. Sect. Nomimium was paraphyletic. Although each subsectional grouping was in accordance with previous infrageneric classification based on morphological characters, yet discordance remained at the series level. Two evolutionary trends observed in the ITS tree were as follows. First, subsect. Trigonocarpae(x=10) was derived from the outgroup(x=6); Second, subsects. Bilobatae and Vaginatae(x=10 or 12), and subsect. Patellares(x=12) of sect. Nomimium were originated from sects. Dischidium and Chamaemelanium(x=6). Viola albida complex including three very closely related taxa was recognized as independent group within subsect. Patellares in parsimony tree. This result suggested that they should be treated as a taxa in series Pinnatae. Phylogenetic position of a putative hybrid species, Viola woosanensis was not supported with previous morphological hypothesis.

한국산 제비꽃속 35분류군과 일본산 4집단, 군외군 1분류군 등 총 40집단에 대한 계통 유연관계를 알아보기 위하여 핵 rDNA의 internal transcribed spacer(ITS)지역에 대한 염기서열을 분석하였다. 정렬된 염기서열들은 bootstrap을 포함한 parsimony 방법과 neighbor-joining 방법을 통하여 계통수를 평가하였다. 그 결과 진정제비꽃절의 낚시제비꽃아절은 군내군의 가장 기부에 분계조를 형성하였으며, 장백제비꽃절은 노랑제비꽃절과 자매군을 형성하면서 진정제비꽃절의 낚시제비꽃아절과 콩제비꽃아절, 고깔제비꽃아절, 제비꽃아절 사이에서 단계통군을 형성하였다. 진정제비꽃절은 병계원적인 분계조를 형성하였고 4개 아절은 독립적인 분계조를 형성하였지만 계열 수준에서는 구별이 불가능하였다. 세포학적 연구에 기초한 제비꽃속의 분화에서 기본염색체 수 x=10을 갖는 낚시제비꽃아절은 x=6인 군외군에서 독립적으로 분화한 것으로 나타났으며 나머지 분류군들은 x=6인 노랑제비꽃과 장백제비꽃아절로부터 x=10 또는 12인 콩제비꽃과 고깔제비꽃아절을 거쳐 x=12인 제비꽃아절로 분화한 특징을 보였다. 형태적인 변이가 매우 심한 분류군으로 알려진 태백제비꽃(V. albida complex)은 Patellares아절 내에서 하나의 군으로 유집되어 Pinnatae계열로 처리하는 것이 타당할 것으로 생각되며, 뫼제비꽃과 남산제비꽃의 잡종인 우산제비꽃은 형태적 특징에 의한 분류와는 일치하지 않는 것으로 나타났다.

Keywords

Acknowledgement

Supported by : 한국과학재단

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