Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
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Phylogenetic Analysis of Korean Native Aster Plants Based on Internal Transcribed Spacer (ITS) Sequences

ITS 염기서열을 이용한 한국산 참취속 식물의 유연관계분석

  • Hong, Su-Young (Highland Agriculture Research Center, National Institute of Crop Science, Rural Development Administration) ;
  • Cho, Kwang-Soo (Highland Agriculture Research Center, National Institute of Crop Science, Rural Development Administration) ;
  • Yoo, Ki-Oug (Department of Biological Sciences, Kangwon National University)
  • 홍수영 (농촌진흥청 국립식량과학원 고령지농업연구센터) ;
  • 조광수 (농촌진흥청 국립식량과학원 고령지농업연구센터) ;
  • 유기억 (강원대학교 생명과학과)
  • Received : 2011.12.04
  • Accepted : 2012.01.25
  • Published : 2012.04.30
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Abstract

This study was carried out to decide ITS (internal transcribed spacer) sequence of some Korean native $Aster$ species and to resolve their relationship among Korean native $Aster$, including $Kalimeris$, $Gymnaster$, $Heteropappus$ genus separated from $Aster$ in a previously study based on the pappus length. We registered 11 ITS sequences of $Aster$ species including $A.$ $glehni$ to GenBank and those sequences were used for the cluster analysis with $Kalimeris$ species. The size of ITS1 was varied from 248 to 256 bp, while ITS2 was varied from 220 to 222 bp. The G + C content of the ITS region ranged from 49.4 to 53.5%. Pairwise comparison results showed that the substitution rate of ITS1 and ITS2 region was 9% and 10%, respectively. $Kalimeris$ sensu strict substitution rate was lower than that of $Aster$ sensu strict species. The strict consensus parsimonious cluster analysis showed $A.$ $tripolium$ is the first branching from the clade and the next is $A.$ $scaber$. The $Kalimeris$ species except for the $A.$ $hispidus$ were grouped into the same clade with high bootstrap value (91%) within $Aster$. $Gymnaster$ and $Heteropappus$ that has been classified by morphological characters were also grouped into broad sense $Aster$ clade. These results implied these three genera could be merged together into $Aster$ based on the ITS sequences.

본 연구는 국내산 참취속 식물의 ITS(internal transcribed spacer) 염기서열을 결정하고 이들을 이용하여 $Kalimeris$, $Gymnaster$, $Heteropappus$ 속 식물들간의 유연관계를 분석하고자 수행되었다. 섬쑥부쟁이($A.$ $glehnii$) 등을 포함한 11종의 참취속 식물의 ITS 염기서열을 결정하였으며 유전자 은행에 등록된 $Kalimeris$ 속 식물의 ITS 염기서열을 포함하여 군집분석을 실시하였다. ITS1의 길이는 249-253bp로, ITS2의 길이는 181-217bp로 나타났으며 G + C 함량은 47-54%의 변이를 나타내었다. 본 연구에서 다룬 16종의 18개체간 염기 치환율은 한 site당 ITS1의 경우는 9%, ITS2는 10%로 나타나 ITS1과 2 부위간의 차이가 거의 없는 것으로 나타났다. 또한 협의의 참취속($Aster$ sensu strict) 식물과 $Kalimeris$ 속 식물의 치환율을 비교한 결과 ITS1과 ITS2 지역 모두 $Kalimeris$ 속 식물이 낮게 나타났다. 계통분석결과, 갯개미취는 군외군으로부터 가장 먼저 분지하였으며, 일본산 $A.$ $bellidiastrum$이 나머지 분류군들을 위한 자매군으로 유집되었다. 참취는 다른 참취속 식물들과 분리되어 독립적인 분계조를 형성하였다. 갯쑥부쟁이($A.$ $hispidus$)를 제외한 $Kalimeris$ 속 식물은 91%의 높은 지지율을 가지고 광의의 참취속내로 유집되었으며 $Gymnaster$와 $Heteropappus$ 속 식물 역시 광의의 참취속으로 유집되었다. 이러한 연구결과는 $Kalimeris$, $Gymnaster$ 및 $Heteropappus$로 세분되었던 참취속을 ITS 염기서열을 바탕으로 통합될 수 있을 것으로 판단된다.

Keywords

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