Rapid radiation of Rheum (Polygonaceae) and parallel evolution of morphological traits
Rapid radiation of Rheum (Polygonaceae) and parallel evolution of morphological traits
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大黄（蓼科）的快速辐射与形态性状的平行进化
DOI：
10.1016/j.ympev.2012.01.002
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发表时间：
2012-04-01
影响因子：
4.1
通讯作者：
Liu, Jianquan
中科院分区：
文献类型：
--
作者：
Sun, Yongshuai;Wang, Ailan;Liu, Jianquan
在这项研究中，我们考察了大黄属植物的多样性历史，并检验了与植物‘身体计划’相关的形态性状在该属中平行进化的假设。我们测序了该属34个种和近缘属13个种的8个叶绿体DNA片段(相当于每个物种8000多个碱基的序列)。系统发育分析表明，大黄属所有种都与双种大黄属(Oxyria)形成了一个单系姊妹系，表明在其进化史上曾发生过辐射多样性。我们的测年分析进一步表明，这些辐射在很大程度上与青藏高原(QTP)的广泛隆升相吻合。祖先状态重建和可能性敏感度测试有力地表明，仰卧和像温室一样的体型特征在不同的支系中平行进化。我们的发现突出了QTP的提升在促进物种多样性和形态特征的平行进化方面的重要性，这些特征在这样的进化历史中被认为是适应性的。(C)2012 Elsevier Inc.保留所有权利。
In this study, we examined diversification history of Rheum and tested the hypothesis that morphological traits related to plant 'body-plans' evolved in parallel in this genus. We sequenced eight chloroplast DNA fragments (representing more than 8000 bps of the sequence for each species) of 34 species from the genus and 13 species from closely related genera. Phylogenetic analyses indicate that all species of Rheum form a monophyletic lineage sister to the two-species genus Oxyria, indicating that radiative diversifications have occurred in its evolutionary history. Our dating analyses further suggest that these radiations largely coincided with the extensive uplifts of the Qinghai-Tibetan Plateau (QTP). Ancestral state reconstruction and likelihood sensitivity tests strongly indicate that both decumbent and 'glasshouse-like' body-plan traits evolved in parallel in different clades. Our findings highlight the importance of the uplift of the QTP in promoting species diversification and the parallel evolution of morphological traits that are putatively adaptive during such an evolutionary history. (C) 2012 Elsevier Inc. All rights reserved.