식물분류학회지 (Korean Journal of Plant Taxonomy)

  • 제44권1호
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  • Pages.22-32
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  • 2014
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  • 1225-8318(pISSN)
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  • 2466-1546(eISSN)
한국식물분류학회 (The Korean Society of Plant Taxonomists)
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미세구조학적 형질 및 핵 리보솜 DNA의 ITS 염기서열에 의한 긴병꽃풀속(꿀풀과)의 계통분류학적 연구

A systematic study of Glechoma L. (Lamiaceae) based on micromorphological characters and nuclear ribosomal ITS sequences

  • 장태수 (경희대학교 이과대학 생물학과 및 기초과학연구소) ;
  • 이중구 (한국생명공학연구원) ;
  • 홍석표 (경희대학교 이과대학 생물학과 및 기초과학연구소)
  • Jang, Tae-Soo (Department of Biology & Institute of Basic Sciences, Kyung Hee University) ;
  • Lee, Joongku (Korea Research Institute of Bioscience and Biotechnology) ;
  • Hong, Suk-Pyo (Department of Biology & Institute of Basic Sciences, Kyung Hee University)
  • 투고 : 2013.07.19
  • 심사 : 2014.03.03
  • 발행 : 2014.03.31
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초록

꿀풀과에 속하는 긴병꽃풀속(Glechoma)내 5종에 대한 화판과 악편의 미세 구조를 관찰하여 기재하고 그 분류학적 유용성을 판단하였으며, 분자계통학적 유연관계를 확인하기 위하여 핵 리보솜 DNA의 ITS 염기서열에 기초한 연구를 수행하였다. 기공복합체는 조사된 모든 분류군의 악편에서 분포하였으며, 공변세포의 길이는 분류군마다 다소 차이를 보였다. 긴병꽃풀속 분류군들의 화판과 악에 분포하는 모용은 5 종류(단세포 비선모, 다세포 비선모, 짧은 자루 두상 선모, 긴 자루 두상 선모, 방패형 선모)로 나타났으며, 모용의 종류, 분포, 밀도가 분류군마다 다르게 나타났다. 핵 리보솜 DNA의 ITS 염기서열에 의한 분자계통학적 연구 결과 긴병꽃풀속은 분포지역에 따라 3개의 분계조(유럽-미국, 중국-한국, 일본)로 분리되었다. 한국과 중국에 분포하는 G. longituba는 단계통군을 이루었고, 이탈리아의 특산종인 G. sardoa와 미국 및 유럽에 분포하는 G. hederacea는 단계통군을 형성하였다. G. hirsuta는 유럽의 분계조와 자매군 관계를 이루었으나, 일본에 분포하는 G. grandis는 나머지 분류군들의 상호 유연관계에서 통계적 지지를 얻지 못하였다. 본 연구 결과에서 긴병꽃풀속내의 종간 한계 설정에 있어 화판 및 악의 미세형태형질의 연구보다 핵 리보솜 DNA의 ITS 염기서열에 기초한 분자 계통학적인 연구가 유용한 방법임이 판명되었다. 그러나 구체적인 본 속내 계통 분류학적인 논의를 위해서는 외부 형태학적 형질에 대한 분석을 동시에 수행할 필요가 있으며, 계통학적 유용성이 보다 높은 DNA 구간을 추가로 분석할 필요가 있다.

The petal and sepal micromorphology of five species of Glechoma (Lamiaceae) was investigated to evaluate their taxonomic significance, and a molecular phylogeny using the sequences of internal transcribed spacers (ITS) regions of nuclear ribosomal DNA was carried out to resolve their phylogenetic relationships. Stomatal complexes were mostly found in the inner and outer part of the sepal from all investigated taxa, and the size length of the guard cell was variable among the taxa. Five types of trichomes (uni-cellular non-glandular trichome, multi-cellular non-glandular trichome, short-stalked capitate glandular trichome, long-stalked capitate glandular trichome, and peltate glandular trichome) were variable among the taxa as well as their distribution and density. In molecular phylogenetic studies, the genus Glechoma was composed of three geographically distinct major monophyletic groups (Europe-U.S.A., China-Korea, Japan). G. longituba in Korea and China formed well-supported monophyletic group. G. hederacea in Europe and U.S.A. formed a monophyletic and well-supported clade with G. sardoa, which are endemic species in Italy, with G. hirsuta falling as a sister to this clade. However, G. grandis did not form any phylogenetic relationships with the remaining taxa. The ITS analyses provided taxonomic boundaries of taxa in Glechoma although the petal and sepal micromorphological characters provided weak evidences of the systematic value. As further studies, incorporating more DNA regions to the matrix including other additional morphological analysis will be significant to provide clearer taxonomic structure in Glechoma.

키워드

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피인용 문헌

  1. rDNA Loci Evolution in the Genus Glechoma (Lamiaceae) vol.11, pp.11, 2016, https://doi.org/10.1371/journal.pone.0167177
  2. Floral micromorphology and microsporogenesis of the gynodioecious herbGlechoma longituba(Lamiaceae) vol.33, pp.6, 2015, https://doi.org/10.1111/njb.00844
  3. Nutlet morphology in the tribe Elsholtzieae (Lamiaceae) vol.38, pp.8, 2020, https://doi.org/10.1111/njb.02677
  4. Comparative Floral and Pollen Micromorphology of Leonurus japonicus and L. macranthus (Lamiaceae) vol.13, pp.11, 2014, https://doi.org/10.3390/d13110533