Three new, early diverging Carex (Cariceae, Cyperaceae) lineages from East and Southeast Asia with important evolutionary and biogeographic implications
Three new, early diverging Carex (Cariceae, Cyperaceae) lineages from East and Southeast Asia with important evolutionary and biogeographic implications
复制标题
DOI：
10.1016/j.ympev.2015.04.001
复制
发表时间：
2015-07-01
影响因子：
4.1
通讯作者：
Ford, Bruce A.
中科院分区：
文献类型：
--
作者：
Starr, Julian R.;Janzen, Francesco H.;Ford, Bruce A.
传统的Cariceae和苔草（1966 spp.）分类确认了五个属（苔草属、伞叶苔属、嵩草属、Schoenoxiphium、Uncinia）和四个亚属（苔草属、Vignea、Vigneastra、Psyllophora）。然而，分子研究表明，只有苔草属，分为五个主要谱系（核心苔草，Schoenoxiphium，核心Unispicate，Vignea和Siderostictae分支），是天然的。这些研究还表明，许多早期的分歧部落血统是东亚的起源，但东亚群体的抽样一直很差，并支持内部和主要Cariceae分支之间的关系一直很弱。为了测试苔草中关系的深层模式，我们组装了迄今为止最长的序列数据集（ITS，ETS If，matIC，ndhF，rps 16; ca. 4400 bp），分类学采样集中在东亚和东南亚的苔草部分，这些苔草部分模糊了亚属界限（Decorae，Graciles，Mundae）或一直是部落起源理论的核心（Hemiscaposae，Indicae，Surculosae，Euprepes，Mapanhfoliae，Hypolytroides）。结果表明，subg。Vigneastra具有高度多系性（在公认的七个主要谱系中有五个），并且它们在一次分析中为所有之前公认的主要Cariceae分支提供了迄今为止最强有力的支持（93% BS）。此外，研究结果提供了强有力的证据，为三个以前未被承认的早期分歧东亚和东南亚的谱系：一个“Hypolytroides分支”（节Hypolytroides）姐妹的Siderostictae分支，和一个“dispensiflora谱系”（节Mundae）和形态多样的“小核心苔草分支”（节。龙胆，Decorae，Mapaniifoliae，Euprepes，Indicae）作为连续姐妹篇约1400种核心苔草分支。我们的研究结果还表明，形态多样性可能发生在分支占主导地位的亚洲物种，然后通过渠道，以更窄的范围内的形态，物种丰富，世界性的血统。(C)2015 Elsevier Inc. All rights reserved.
Traditional Cariceae and Carex (1966 spp.) classifications recognised five genera (Carex, Cymophyllus, Kobresia, Schoenoxiphium, Uncinia) and four subgenera (Carex, Vignea, Vigneastra, Psyllophora). However, molecular studies have shown that only Carex, divided into five major lineages (the Core Carex, Schoenoxiphium, Core Unispicate, Vignea and Siderostictae Clades), is natural. These studies have also suggested that many early diverging tribal lineages are East Asian in origin, but the sampling of East Asian groups has been poor, and support for relationships within and among major Cariceae clades has been weak. To test deep patterns of relationship in Carex we assembled the longest sequence dataset yet (ITS, ETS If, matIC, ndhF, rps16; ca. 4400 bp) with taxonomic sampling focused on critical East and Southeast Asian Carex sections that have blurred subgeneric limits (Decorae, Graciles, Mundae) or have been at the heart of theories on tribal origins (Hemiscaposae, Indicae, Surculosae, Euprepes, Mapanhfoliae, Hypolytroides). Results indicate that subg. Vigneastra is highly polyphyletic (in five of seven major lineages recognised), and they provide the strongest support yet seen for all previously recognised major Cariceae clades in a single analysis ( 93% BS). Moreover, results provide strong evidence for three previously unrecognised early diverging East and Southeast Asian lineages: a "Hypolytroides Clade" (sect. Hypolytroides) sister to the Siderostictae Clade, and for a "Dissidflora Lineage" (sect. Mundae) and a morphologically diverse "Small Core Carex Clade" (sects. Graciles, Decorae, Mapaniifoliae, Euprepes, Indicae) as successive sisters to approximately 1400 species in the Core Carex Clade. Our findings also suggest that morphological diversification may have occurred in clades dominated by Asian species followed by canalization to a narrower range of morphologies in species-rich, cosmopolitan lineages. (C) 2015 Elsevier Inc. All rights reserved.