Phylogeny and evolutionary histories of Pyrus L. revealed by phylogenetic trees and networks based on data from multiple DNA sequences
Phylogeny and evolutionary histories of Pyrus L. revealed by phylogenetic trees and networks based on data from multiple DNA sequences
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基于多个 DNA 序列数据的系统发育树和网络揭示了 Pyrus L. 的系统发育和进化历史
DOI：
10.1016/j.ympev.2014.07.009
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发表时间：
2014-11-01
影响因子：
4.1
通讯作者：
Teng, Yuanwen
中科院分区：
文献类型：
--
作者：
Zheng, Xiaoyan;Cai, Danying;Teng, Yuanwen
由于梨属植物分布广泛，缺乏丰富的资料，重建梨属植物的系统发育一直是困难的。本研究收集了代表25个梨属种的110份材料，并基于多个DNA序列数据集构建了系统发育树和系统发育网络。基于cpDNA和核LFY 2 int 2-N（LN）数据构建的系统发育树分辨率较低，尤其是LN树中只有5个主要种为单系。LN的系统发育网络表明，杂交引起的网状化是梨属物种的主要进化过程之一。基因树的多分支和叶绿体DNA网络的星形结构表明快速辐射是另一个主要的进化过程，特别是对于西方物种。梨属中最早分化的种是红梨和梨。两个北非种，P. cordata，P. spinosa和P. betulaefolia是原始股票梨物种的后代，仍然具有一些共同的分子特征。我国西南地区是梨属植物最重要的多样化中心，分布着大量的梨属植物种群。为了进一步了解梨属植物的进化历史，还需要更多的材料和核基因。(C)2014爱思唯尔公司All rights reserved.
Reconstructing the phylogeny of Pyrus has been difficult due to the wide distribution of the genus and lack of informative data. In this study, we collected 110 accessions representing 25 Pyrus species and constructed both phylogenetic trees and phylogenetic networks based on multiple DNA sequence datasets. Phylogenetic trees based on both cpDNA and nuclear LFY2int2-N (LN) data resulted in poor resolution, especially, only five primary species were monophyletic in the LN tree. A phylogenetic network of LN suggested that reticulation caused by hybridization is one of the major evolutionary processes for Pyrus species. Polytomies of the gene trees and star-like structure of cpDNA networks suggested rapid radiation is another major evolutionary process, especially for the occidental species. Pyrus calleryana and P. regelii were the earliest diverged Pyrus species. Two North African species, P. cordata, P. spinosa and P. betulaefolia were descendent of primitive stock Pyrus species and still share some common molecular characters. Southwestern China, where a large number of P. pashia populations are found, is probably the most important diversification center of Pyrus. More accessions and nuclear genes are needed for further understanding the evolutionary histories of Pyrus. (C) 2014 Elsevier Inc. All rights reserved.