Phylogenetic perspectives on diversification and character evolution in the species-rich genus Erysimum (Erysimeae; Brassicaceae) based on a densely sampled ITS approach
Phylogenetic perspectives on diversification and character evolution in the species-rich genus Erysimum (Erysimeae; Brassicaceae) based on a densely sampled ITS approach
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DOI：
10.1111/boj.12184
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发表时间：
2014-08-01
影响因子：
2.4
通讯作者：
Oxelman, Bengt
中科院分区：
文献类型：
--
作者：
Moazzeni, Hamid;Zarre, Shahin;Oxelman, Bengt
糖芥属包括150-350种，分布在北方半球，欧亚大陆是最大的多样性中心。它是众所周知的，其分类复杂性作为重叠的形态特征的结果。我们提出了第一个密集采样糖芥属的系统发育分析使用的内部转录间隔区（ITS）的DNA序列从c。85%的种（117种为首次发现），代表了形态变异和地理分布的全方位。我们使用了几种方法来重建系统发育关系，在属的形态特征的多样性和模式的演变。采用最大简约法、最大似然法和贝叶斯方法对四个形态诊断性状进行了形态状态重建。我们的系统发育框架强烈支持糖芥属的单系性，并恢复了一些地理上，而不是形态上，相关的支持分支。我们的研究证实了糖芥属在谱系I中的位置，并揭示了两个Malcolmia属。（M. maritima和M. orsiniana）为姊妹类群。结果表明，二年的持续时间和丛生的习惯（相对于一年或多年生的持续时间和草本或木本的习惯）和大，黄色，无毛（相对于小，非黄色，短柔毛）的花瓣是祖先在糖芥。祖先状态重建结果表明，一年生与多年生和木本与草本特征已经独立地推导了几次。测年结果表明，糖芥属植物在上新世晚期或更新世早期有辐射作用。(C)2014年伦敦林奈学会
Erysimum includes 150-350 species distributed in the Northern Hemisphere, with Eurasia being the centre of greatest diversity. It is well known for its taxonomic complexity as a result of overlapping morphological characters. We present the first densely sampled phylogenetic analysis of Erysimum using internal transcribed spacer (ITS) DNA sequences from c. 85% of the species (117 for the first time), representing the full range of morphological variation and geographical distribution. We used several approaches to reconstruct phylogenetic relationships, dating of diversification and patterns of evolution of morphological characters in the genus. Ancestral-state reconstructions of four morphological diagnostic characters were performed using maximum parsimony, maximum likelihood and Bayesian methods. Our phylogenetic framework strongly supports the monophyly of Erysimum and recovers some well-supported clades that are geographically, rather than morphologically, correlated. Our study confirms the placement of Erysimum in lineage I and reveals two Malcolmia spp. (M. maritima and M. orsiniana) as its sister taxa. The results suggest that the biennial duration and caespitose habit (vs. annual or perennial duration and herbaceous or woody habit) and large, yellow, glabrous (vs. small, non-yellow, pubescent) petals are ancestral in Erysimum. The ancestral-state reconstruction results show that annual vs. perennial and woody vs. herbaceous features have been independently derived several times. The dating analyses suggest an early radiation of Erysimum during the late Pliocene or early Pleistocene. (C) 2014 The Linnean Society of London