Molecular phylogeny of Incarvillea (Bignoniaceae) based on its and trnL-F sequences
Molecular phylogeny of Incarvillea (Bignoniaceae) based on its and trnL-F sequences
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DOI：
10.3732/ajb.92.4.625
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发表时间：
2005-04-01
影响因子：
3
通讯作者：
Cronk, Q
中科院分区：
文献类型：
--
作者：
Chen, ST;Guan, KY;Cronk, Q
角蒿属（Incarvillea）是紫藤科（Bignoniaceae）的一个温带草本植物，以前分为四个亚属，Niedzuwedzzkio，Amphicome，Incarvillea和Pteroscleris。Niedzwedzkia和Amphicome在过去被视为独立的属。不同的关系已被提出的四个亚属。在这里，最大简约分析使用ITS和trnL-F序列导致相似的树，并表明属是单系。综合数据的分析导致一个单一的树与五个主要的分支高度支持和良好的解决。五个主要分支的关系是（Niedzwedzkia亚属（Incarvillea olgae（Amphicome亚属（Incarvillea亚属，Pteroscleris亚属））））。所有四个亚属都很好地支持了单系性，除了角蒿亚属，这里用I. sinensis和I.奥盖。角蒿与L sinensis的亲缘关系不密切，这一结论得到了形态学的支持。两个基部单型亚属发现于中亚。种类最丰富的亚属Pteroscleris在喜马拉雅-横断山区有10种，可能较早从中亚扩散到东亚。Pteroscleris内分子树上短分支长度表明这个形成莲座花的亚属最近和快速的辐射，可能与喜马拉雅-横断山脉的隆升有关。
Incarvillea is a herbaceous and temperate member of Bignoniaceae, previously divided into four subgenera, Niedzuwedzzkio, Amphicome, Incarvillea, and Pteroscleris. Niedzwedzkia and Amphicome have in the past been treated as independent genera. Different relationships have been proposed for the four subgenera. Here, maximum parsimony analysis using ITS and trnL-F sequences resulted in similar trees and showed that the genus is monophyletic. Analysis of the combined data resulted in a single tree with five major clades highly supported and well resolved. The relationships of the five major clades are (subgenus Niedzwedzkia (Incarvillea olgae (subgenus Amphicome (subgenus Incarvillea, subgenus Pteroscleris)))). All four subgenera are well supported for monophyly, with the exception of subgenus Incarvillea, represented here by I. sinensis and I. olgae. Incarvillea olgae is not closely related to L sinensis, a conclusion supported by morphology. The two basal monotypic subgenera are found in Central Asia. The most species-rich subgenus, Pteroscleris, has 10 species in the Himalaya-Hengduan Mountains and may have dispersed early from central Asia to eastern Asia. Short branch lengths on the molecular trees within Pteroscleris suggest a recent and rapid radiation of this rosette-forming subgenus, perhaps connected with the uplift of the Himalaya-Hengduan massif.