New insights into the phylogeny of Burasaieae (Menispermaceae) with the recognition of a new genus and emphasis on the southern Taiwanese and mainland Chinese disjunction
New insights into the phylogeny of Burasaieae (Menispermaceae) with the recognition of a new genus and emphasis on the southern Taiwanese and mainland Chinese disjunction
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通过认识一个新属并强调台湾南部和中国大陆的分离，对 Burasaieae（防己科）的系统发育有新的见解
DOI：
10.1016/j.ympev.2016.12.038
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发表时间：
2017-04-01
影响因子：
4.1
通讯作者：
Chen, Zhi-Duan
中科院分区：
文献类型：
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作者：
Wang, Wei;Ortiz, Rosa Del C.;Chen, Zhi-Duan
台湾是一个大陆岛屿，位于欧亚板块和菲律宾构造板块的交界处，具有高度的生物多样性。台湾南部，即。横春半岛的植物区系与台湾北部明显不同。关于恒春半岛植物区系的起源和关系，从系统发育的角度进行研究的报道很少。本研究利用6个叶绿体和核序列的数据，重建了主要生活在热带雨林的防风草科(防己科)的系统发育关系。基于树的比较表明，cpDNA与其树的位置存在明显的冲突。然而，ITS数据的替代假设检验并没有拒绝cpDNA数据的结果，这表明基于树的比较有时可能会产生人为的不一致，特别是当使用同源性高的标记时。基于cpDNA和ITS数据的结合，我们提出了布拉萨亚科的属间系统发育框架。采自台湾南部的齿状顶孢霉和来自大陆中国的箭尾轮虫分别被归入三个不同的分支，与Burasaieae的六个谱系一起处于悬而未决的位置。通过综合分子系统发育、分化时间和形态的证据，我们将这三个分支识别为三个不同的属，包括狭顶孢属Tinospora Sensu Stricto，齿状和箭形Tinospora的一个新属(Paratinospora)，以及复活的透明孢属。恒春半岛特有的齿状金孢霉起源于始新世晚期(约39 Ma)，大大早于台湾的形成。我们的研究表明，恒春半岛的植物群中含有一些古老的成分，可能是从大陆中国迁徙过来的。(C)2016 Elsevier Inc.保留所有权利。
Taiwan is a continental island lying at the boundary between the Eurasian and the Philippine tectonic plates and possesses high biodiversity. Southern Taiwan, viz. Hengchun Peninsula, is notably floristically different from northern Taiwan. The floristic origin and relationships of the Hengchun Peninsula have been rarely investigated in a phylogenetic context. In this study, data from six plastid and nuclear sequences were used to reconstruct phylogenetic relationships within Burasaieae (Menispermaceae), which mainly inhabits tropical rainforests. The tree-based comparisons indicate that the position of Tinospora sensu stricto conflicts significantly between the cpDNA and ITS trees. However, alternative hypothesis tests from the ITS data did not reject the result of the cpDNA data, which suggests that tree-based comparisons might sometimes generate an artificial incongruence, especially when markers with high homoplasy are used. Based on the combined cpDNA and ITS data, we present an inter generic phylogenetic framework for Burasaieae. Sampled species of Tinospora are placed in three different clades, including Tinospora dentata from southern Taiwan and T. sagittata from mainland China in an unresolved position alongside six lineages of Burasaieae. By integrating lines of evidence from molecular phylogeny, divergence times, and morphology, we recognize the three Tinospora clades as three different genera, including Tinospora sensu stricto, a new genus (Paratinospora) for T. dentata and T. sagittata, and Hyalosepalum resurrected. Tinospora dentata, now endemic to the Hengchun Peninsula, originated from the Late Eocene (ca. 39 Ma), greatly predating the formation of Taiwan. Our study suggests that the flora of the Hengchun Peninsula contains some ancient components that might have migrated from mainland China. (C) 2016 Elsevier Inc. All rights reserved.