Korean Journal of Plant Taxonomy (식물분류학회지)

The Korean Society of Plant Taxonomists (한국식물분류학회)
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A new combination for Saxifraga octopetala (Saxifragaceae) and its phylogenetic relationship

구실바위취의 신조합명 및 계통 유연관계

  • Kim, Yong-In (Freshwater Bioresources Research Division, Nakdonggang National Institute of Biological Resources) ;
  • Cho, Seong Hyun (Department of Life Science, Hallym University) ;
  • Kim, Bo-Yun (Department of Life Science, Hallym University) ;
  • Lee, Jung-Hoon (Department of Life Science, Hallym University) ;
  • Kang, Dae-Hyun (Department of Life Science, Hallym University) ;
  • Kim, Soonok (Biological and Genetic Resources Assessment Division, National Institute of Biological Resources,) ;
  • Doudkin, Roman V. (Far Eastern Federal University, Botanical Garden-Institute FEB RAS) ;
  • Kim, Young-Dong (Department of Life Science, Hallym University)
  • 김용인 (국립낙동강생물자원관 담수생물조사연구실 동식물자원조사팀) ;
  • 조성현 (한림대학교 생명과학과) ;
  • 김보윤 (한림대학교 생명과학과) ;
  • 이정훈 (한림대학교 생명과학과) ;
  • 강대현 (한림대학교 생명과학과) ;
  • 김순옥 (국립생물자원관 유용자원분석과) ;
  • ;
  • 김영동 (한림대학교 생명과학과)
  • Received : 2015.10.08
  • Accepted : 2015.12.09
  • Published : 2015.12.31
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Abstract

This study was conducted to address the taxonomic status of the Korean endemic species Saxifraga octopetala, which is sometimes considered conspecific to Micranthes manchuriensis. Extensive molecular phylogenetic analysis using nrITS sequences as well as morphological examination of type specimens of the two species were undertaken to ascertain the phylogenetic position and species delimitation of S. octopetala. In the resulting nrITS trees, a total of 65 accessions representing S. octopetala grouped together and nested within the Micranthes clade, exhibiting a close relationship with M. nelsoniana and M. manchuriensis. Multiple accessions of M. manchuriensis collected from China and Russia also formed a clade, showing a sister group relationship with M. nelsoniana var. pacifica and M. fusca. The ambiguous species entity of S. octopetala is thought to have originated from Nakai's misinterpretation of Wilford's collection (type specimens of M. manchuriensis), which is a complex collection including an inflorescence of M. nelsoniana. In spite of apparent morphological similarity between S. octopetala and M. manchuriensis, they differ in the presence and absence of underground stolons. The distinct position of S. octopetala within the Micranthes clade on the nrITS tree suggests that it should retain species status in Micranthes. Thus a new combination (Micranthes octopetala) is proposed.

본 연구에서는 간혹 흰바위취(Micranthes manchuriensis)와 동일종으로 취급되기도 하는 한국 고유종 구실바위취(Saxifraga octopetala)의 분류학적 지위를 알아보고자 수행되었다. 구실바위취의 계통학적 위치와 종의 경계를 확인하기 위해 두 종의 기준표본에 대한 형태적 검토와 핵 리보솜 DNA의 ITS 지역 염기서열에 대한 집중적인 계통분석을 시행하였다. 총 65개 구실바위취 개체는 ITS 계통수에서 하나의 무리를 이루면서 Micranthes 분기군(clade)에 포함되었고, 톱바위취 및 흰바위취와 가까운 계통 유연관계를 나타내었다. 중국과 러시아에서 채집된 다수의 흰바위취 개체 역시 독자적인 분기군을 형성하면서 M. nelsoniana var. pacifica 및 M. fusca와 자매군을 이루었다. 구실바위취의 실체가 모호했던 것은 흰바위취 개체와 톱바위취의 화서를 함께 포함하고 있는 복합표본인 Wilford의 채집품(흰바위취의 기준표본)을 Nakai가 잘못 관찰하였기 때문으로 생각되었다. 구실바위취와 흰바위취의 높은 형태적 유사성에도 불구하고 이들은 지하 포복경의 특징에 있어서 차이를 보였다. ITS 계통수에서 구실바위취가 Micranthes 내에 자리하는 것으로 나타나 구실바위취는 Micranthes 내에서 종의 지위를 유지하여야 할 것으로 판단되었고, 이에 따라 신조합명(Micranthes octopetala)을 발표하였다.

Keywords

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