Molecular phylogeny and biogeography of Holcoglossum (Orchidaceae: Aeridinae) based on nuclear ITS, and chloroplast trnL-F and matK
Molecular phylogeny and biogeography of Holcoglossum (Orchidaceae: Aeridinae) based on nuclear ITS, and chloroplast trnL-F and matK
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DOI：
10.1002/tax.583013
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发表时间：
2009-08-01
期刊：
影响因子：
3.4
通讯作者：
Jin, Xiao-Hua
中科院分区：
文献类型：
--
作者：
Fan, Jie;Qin, Hai-Ning;Jin, Xiao-Hua
根据25个分类群的叶绿体matK和trnL-F基因序列及核ITS区序列，对亚洲兰属Holcoglossum（Vandeae，Aeridinae）的系统发育关系和系统地理进行了分析。(12 Holcoglossum，11 Aeridinae，2 outgroups）。利用简约法和贝叶斯方法对组合数据进行分析，结果表明，沟舌属植物是一个单系种，包括两个有争议的种，H。amesianum和H.亚支由3个支持良好的主要亚支组成，与Holcoglossum的生物多样性中心一致：一个热带亚支包括4个种，另一个形成一个由6个种组成的多分支，仅限于横断山脉的温带高山地区，第三个亚支包括2个种，有点分布在前两个地区之间。然而，这三个主要的亚支只是部分符合以前的亚属分类的基础上形态特征。唇片、长而圆锥形的距和渐细的柄似乎在沟舌属中至少进化了两次，类似地，授粉系统至少发生了两次转变。地理位置分析和分子遗传学研究表明，由于青藏高原的隆升，裂舌草属植物从热带地区向横断山脉地区扩散，并向横断山脉地区辐射。
The phylogenetic relationships and biogeography of the Asiatic orchid genus Holcoglossum (Vandeae, Aeridinae) were inferred from sequences of chloroplast matK and trnL-F genes and nuclear ITS regions of 25 taxa. (12 Holcoglossum, 11 Aeridinae, 2 outgroups). Analysis of combined datasets with parsimony and Bayesian methods revealed that Holcoglossum is highly Supported as monophyletic, including two debatable species, H. amesianum and H. subulifolium, and consists of three well-supported major subclades which agree well with biodiversity centers of Holcoglossum: one tropical subclade comprising four species, another forming a polytomy comprising six species restricted to the temperate alpine region of the Hengduan Mountains, and the third with two species somewhat distributed between the first two regions. However, these three major subclades are only partly in accordance with previous infrageneric classifications based on morphological characters. The lip lamella, long and conical spur and tapering stipe seem to have evolved at least twice in Holcoglossum, similarly the pollination system shift has occurred at least twice. Vicariance analyses and molecular phylogeny suggest that Holcoglossum dispersed from tropical regions to the Hengduan Mountains and then radiated there as a result of the uplift of Qinghai-Tibetan Plateau.