Secondary contact, hybridization and polyploidization add to the biodiversity in the Hengduan Mountains, exemplified by the widespread Corallodiscus lanuginosus (Gesneriaceae)
Secondary contact, hybridization and polyploidization add to the biodiversity in the Hengduan Mountains, exemplified by the widespread Corallodiscus lanuginosus (Gesneriaceae)
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二次接触、杂交和多倍化增加了横断山的生物多样性，广泛分布的硬珊瑚（苦苣苔科）就是例证
DOI：
10.1007/s00606-017-1392-0
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发表时间：
2017-02
影响因子：
1.9
通讯作者：
Michael Mo ̈ller
中科院分区：
文献类型：
--
作者：
Ping Zhou;Jie Li;Michael Mo ̈ller
珊瑚分布在东北-西南边界12,000公里处，在横断山-西南中国山脉显示出最高的形态多样性。我们研究了该物种高度多样性背后的机制。我们获得了该属分布范围内的ITS序列数据，重建了过时的系统发育，将得到的分支投影到地理地图上，并将结果与推断的种群倍性水平联系起来。我们发现ITS分支的地理格局很强，但有广泛的重叠范围，特别是在横断山区。我们推测羊毛虫的起源是在渐新世中期。我们使用其多态的存在来推断高水平的杂交事件主要发生在分支重叠的区域，在那里我们也推断重复的四倍化事件已经发生。第四纪以前和后第四纪气候振荡驱动的分布范围的扩大和收缩允许二次接触、杂交和融入，形成了目前该物种形态多样性的斑块分布。多倍化作为一种强化的遗传障碍，增加了遗传在空间和时间上的多样性，特别是在横断山区。
Corallodiscus lanuginosus is distributed 12,000 km across its northeast–southwest boundaries, showing its highest morphological diversity in the Heng- duan Mountains, Southwest China. We investigated the mechanisms behind the high diversity in this species. We acquired ITS sequence data across the distribution range of the genus, reconstructed dated phylogenies, projected the resulting clades onto geographic maps and linked the results with inferred ploidy levels of the populations. We found strong geographic patterns for the ITS clades but with extensively overlapping ranges, particularly in the Hengduan Mountains area. We deduced an origin of C. lanuginosus in the mid-Oligocene. We used the presence of ITS polymorphisms to infer a high level of hybridization events mainly in areas of clade overlap, where we also inferred repeated tetraploidization events to have taken place. Pre- and post-Quaternary climate oscillation-driven expansions and contractions of distribution ranges have allowed secondary contacts, hybridization and introgres- sion that shaped the current patchy distribution of mor- phological diversity in the species. Polyploidization as a reinforcing genetic barrier added to the genetic diversity in space and time particularly in the Hengduan Mountains.
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DOI：
--
发表时间：
1971
期刊：
--
影响因子：
--
作者：
G. Stebbins
通讯作者：
G. Stebbins
影响因子：
6.5
作者：
Roalson, Eric H.;Roberts, Wade R.
通讯作者：
Roberts, Wade R.
DOI：
--
发表时间：
2006
期刊：
--
影响因子：
--
作者：
通讯作者：
--
影响因子：
3
作者：
Moller, M;Cronk, QCB
通讯作者：
Cronk, QCB
DOI：
10.2134/agronmonogr57.2013.0020
发表时间：
2015-10
期刊：
--
影响因子：
--
作者：
J. Wendel;C. Grover
通讯作者：
J. Wendel;C. Grover