Analysis of DNA sequences of six chloroplast and nuclear genes suggests incongruence, introgression, and incomplete lineage sorting in the evolution of Lespedeza (Fabaceae)
Analysis of DNA sequences of six chloroplast and nuclear genes suggests incongruence, introgression, and incomplete lineage sorting in the evolution of Lespedeza (Fabaceae)
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DOI：
10.1016/j.ympev.2011.10.007
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发表时间：
2012-01-01
影响因子：
4.1
通讯作者：
Zhang, Li-Bing
中科院分区：
文献类型：
--
作者：
Xu, Bo;Wu, Ning;Zhang, Li-Bing
胡枝子属(Fabaceae)胡枝子属植物由40种植物组成，间断分布于东亚和北美东部。通过对5个叶绿体区域(rpl16、rpl32-trnL、rps16-trnQ trnL-F和trnK/matK)和1个核(ITS)DNA序列数据的最大简约、最大似然和贝叶斯分析，重建了胡枝子属所有种及其近缘属的系统发育关系。所有的分析都得出了主要谱系之间一致的关系。我们的结果表明，空心莲、金缕梅和胡枝子分别是单系种系。胡枝子被认定为Kummerowia的姐妹，这两个人一起是Campylotrois的进一步姐妹。这两个亚属都不是亚属。胡枝子和亚属。根据形态特征，胡枝子属中的大胡枝子被恢复为单系。在胡枝子属中，北美分支被检索为亚洲分支的姐妹。核标记和叶绿体标记在浅层系统发育上显示出不一致的系统发育信号，这可能表明胡枝子属的渐渗或不完全的谱系分类。用贝叶斯方法估计胡枝子属内和近缘属间的分化时间。推测随着胡枝子属和胡枝子属在亚洲晚中新世的分化，胡枝子属的祖先分化为北美和亚洲两个谱系。这位北美祖先在中新世晚期通过白令大陆桥迅速迁徙到北美。北美和亚洲的血统在中新世晚期几乎同时开始多样化，但导致两个大陆的物种数量存在偏见。(C)2011 Elsevier Inc.保留所有权利。
The genus Lespedeza (Fabaceae) consists of 40 species disjunctively distributed in East Asia and eastern North America. Phylogenetic relationships of all Lespedeza species and closely related genera were reconstructed using maximum parsimony, maximum likelihood, and Bayesian analyses of sequence data from five chloroplast (rpl16, rpl32-trnL, rps16-trnQ trnL-F, and trnK/matK) and one nuclear (ITS) DNA regions. All analyses yielded consistent relationships among major lineages. Our results suggested that Campylotropis, Kummerowia, and Lespedeza are monophyletic, respectively. Lespedeza is resolved as sister to Kummerowia and these two together are further sister to Campylotropis. Neither of the two subgenera, subgen. Lespedeza and subgen. Macrolespedeza, in Lespedeza based on morphological characters, is recovered as monophyletic. Within Lespedeza, the North American clade is retrieved as sister to the Asian clade. The nuclear and chloroplast markers showed incongruent phylogenetic signals at shallow-level phylogeny, which may point to either introgression or incomplete lineage sorting in Lespedeza. The divergence times within Lespedeza and among related genera were estimated using Bayesian approach with BEAST. It is assumed that following the divergence between Kummerowia and Lespedeza in Asia in the late Miocene, the ancestor of Lespedeza diverged into the North American and the Asian lineages. The North American ancestor quickly migrated to North America through the Bering land bridge in the late Miocene. The North American and Asian lineages started to diversify almost simultaneously in the late Miocene but resulted in biased numbers of species in two continents. (C) 2011 Elsevier Inc. All rights reserved.