Phylogenetic relationships of the rare Korean monotypic endemic genus Pentactina Nakai in the tribe Spiraeeae (Rosaceae) based on molecular data
Phylogenetic relationships of the rare Korean monotypic endemic genus Pentactina Nakai in the tribe Spiraeeae (Rosaceae) based on molecular data
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DOI：
10.1007/s00606-011-0457-8
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发表时间：
2011-07-01
影响因子：
1.9
通讯作者：
Hong, Suk-Pyo
中科院分区：
文献类型：
--
作者：
Lee, Chunghee;Hong, Suk-Pyo
作为朝鲜半岛仅有的六个特有属之一，五角莲的系统发育地位一直难以确定，因为无法获得植物材料。在本文中，我们能够从朝鲜原产范围以外的唯一现存的五角莲标本中获得材料，并确定其与十字花科(Rosaceae)内其他属的系统发育关系。本文首次利用核糖体ITS区和叶绿体DNA trnL-trnF基因间隔区对绣线菊属进行了系统发育分析(最大简约和最大似然)。ITS和组合数据集树表明，五角龙与北美洲西部的一个小属--五角龙有共同的最新祖先，而cpDNA则表明它与凯尔西亚、西比雷亚和石龙属有密切的关系。因此，根据目前的分子序列数据，我们认为稀有的朝鲜单型特有属Pentactina可能与北美西部的小属PetroPhyton有密切的亲缘关系，尽管得到的支持较弱。此外，我们目前的研究表明，五爪菊并不是Hutchinson之前假设的大属绣线菊属的一部分。五指菊属具有几种形态特征的组合，例如直立灌木习性，简单的锯齿状叶和总状花序，在韩国被认为是一个独特的特有属是合理的。
The phylogenetic position of Pentactina Nakai, one of only six endemic genera in the Korean peninsula, has been elusive and difficult to determine due to inaccessibility of plant materials. In this paper, we were able to obtain material from the one and only living collection of Pentactina outside of its native range in North Korea and determined its phylogenetic relationship relative to the other genera within the tribe Spiraeeae (Rosaceae). This paper presents the first molecular phylogeny of the genus Pentactina using both nuclear ribosomal ITS regions as well as chloroplast DNA trnL-trnF intergenic spacers to conduct phylogenetic analyses (maximum parsimony and maximum likelihood) of the Spiraeeae. The ITS and combined data set trees suggest that Pentactina shares its most recent common ancestor with Petrophyton, a small western North American genus, while cpDNA suggests close relationships to Kelseya, Sibiraea, and Petrophyton. Therefore, based on the present molecular sequence data, we suggest that the rare Korean monotypic endemic genus Pentactina possibly has a close relationship with the small western North American genus Petrophyton, although receiving a weak support. In addition, our current study suggests that Pentactina is not part of the large genus Spiraea as previously hypothesized by Hutchinson. Pentactina possess combinations of several morphological features within the Spiraeeae such as an erect shrub habit, simple serrate leaves, and raceme inflorescences, and recognition as a distinct endemic genus in Korea is warranted.