한국산 피막이속(Hydrocotyle L.) 식물의 분자계통학적 연구
Molecular Phylogenetic Studies of Korean Hydrocotyle L.
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초록
한국산 피막이속(Hydrocotyle L.)의 5종과 울릉도에서새로 발견한 H. sp 그리고 outgroup인 병풀 (Centella asiatica)을 포함하여 총 7분류군을 대상으로 분자계통학적 연구를 수행하여 종의 실체 및 문제점을 검토하고 유연관계를 살펴보았다. 분자계통학적 연구의 marker로는nrDNA의 ITS 지역과 cpDNA의 trnH-psbA지역을 사용하였다. 한국산 피막이속은 94%의 지지도로 묶였으며, 크게 4개의 분계조를 형성하였다. 선피막이 (H. maritima)와 피막이 (H. sibthorpioides), 제주피막이 (H. yabei)와큰잎피막이 (H. nepalensis), 큰피막이 (H. ramiflora) 그리고 H. sp가 각각의 분계조를 형성하였다. 그러나 선피막이, 피막이, 제주피막이의 경우 독립된 분계조를 형성하지않았으며, H. sp의 경우 분자적으로 독립적인 분계조를 형성하고 있어 새로운 종으로써의 가능성을 제시하였다.
Abstract
Phylogenetic analyses were conducted to evaluate relationships of 5 taxa of Korean Hydrocotyle, H. spp. found in the Ulleung island including one outgroup (Centella asiatica). The molecular phylogenetic methods based on nuclear ribosomal DNA ITS region and cpDNA trnH-psbA region. Centella asiatica was used outgroup for analysis. As the result,genus Korean Hydrocotyle were grouped by 94% bootstrap value. Korean Hydrocotyle was grouped by four clades; Clade Ⅰ-H. maritima, H. sibthorpides and H. yabei clade Clade Ⅱ- H. nepalensis clade clade Ⅲ- H. ramiflora clade clade Ⅳ- H. spp. clade. H. maritima, H. sibthorpides and H. yabei was not distinguished, seperately. H. spp. was distinctly distinguished other Korean Hydrocotyle.
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