Phylogenetic and Taxonomic Status Analyses of the Abaso Section from Multiple Nuclear Genes and Plastid Fragments Reveal New Insights into the North America Origin of Populus (Salicaceae).
Phylogenetic and Taxonomic Status Analyses of the Abaso Section from Multiple Nuclear Genes and Plastid Fragments Reveal New Insights into the North America Origin of Populus (Salicaceae).
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DOI：
10.3389/fpls.2016.02022
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发表时间：
2016
影响因子：
5.6
通讯作者：
Zhang J
中科院分区：
文献类型：
--
作者：
Liu X;Wang Z;Shao W;Ye Z;Zhang J
虽然Abaso组被广泛接受为一个独立的组，但由于可用标记有限和/或以前研究中缺乏P. mexicana标本，墨西哥杨（Abaso组）的分类地位尚未得到解决。对杨树属6个组的31个杨树种进行了DNA序列测定，获得了23个单拷贝核DNA和34个叶绿体片段。本研究获得了两个更新的杨属植物系统发育。我们发现杨树属的单系性受到核基因和质体基因的强烈支持，这与前人的研究结果一致。P.mexicana在核DNA树中最先分化，位于基部，这意味着Abaso组可能是现存种群中最古老的谱系。鉴于短分支和低统计支持的分歧部分Abaso和Turanga，这一观察可能表明，快速辐射演化后的早期分裂的杨属。在质体树中，P. mexicana与质体树中的现代Tacamahaca组物种聚在一起。基于细胞质和单拷贝的核标记序列，我们假设叶绿体捕获导致了P.mexicana在系统发育树之间的位置不一致。由于首次明确记录了始新世的杨树化石，其叶片形态与现存的墨西哥杨（P.mexicana）相似，以及墨西哥杨（P.mexicana）的系统发育位置，我们支持杨树属起源于北美的假设，这将为杨树属物种起源的发展提供新的见解。
Although, the Abaso section is widely accepted as an independent section, the taxonomic status of Populus mexicana (section Abaso) has not yet been resolved due to the limited availability markers and/or the lack of P. mexicana specimens in previous studies. Thirty-one poplar species that represent six sections of the Populus genus were sampled, and 23 single-copy nuclear DNA and 34 chloroplast fragments were sequenced. The present study obtained two updated phylogenies of Populus. We found that monophyly of the genus Populus is strongly supported by nuclear and plastid gene, which is consistent with previous studies. P. mexicana, diverged first in the nuclear DNA tree, which occupied the basal position, implying that the section Abaso may be the most ancestral lineage in extant populous species. Given that the short branches and low statistical support for the divergence of sections Abaso and Turanga, this observation probably indicated that a rapid radiation evolution following the early split of the genus Populus. In the plastid tree, P. mexicana clustered with modern-day species of section Tacamahaca in the plastid tree. Based on cytoplasmic and single-copy nuclear marker sequences, we hypothesized that chloroplast capture resulted in the inconsistent position of P. mexicana between the phylogenetic trees. Given the first unequivocal records of poplar fossils from the Eocene with similar leaf morphology to the extant P. mexicana and the phylogenetic positions of P. mexicana in our study, we support the hypothesis that the Populus genus originated in North America, which will provide new insights to the development of the origin of Populus species.
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