Plant recolonization in the Himalaya from the southeastern Qinghai-Tibetan Plateau: Geographical isolation contributed to high population differentiation
Plant recolonization in the Himalaya from the southeastern Qinghai-Tibetan Plateau: Geographical isolation contributed to high population differentiation
复制标题
青藏高原东南部喜马拉雅地区的植物重新殖民：地理隔离导致种群高度分化
DOI：
10.1016/j.ympev.2010.05.007
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发表时间：
2010-09-01
影响因子：
4.1
通讯作者：
Wang, Xiao-Quan
中科院分区：
文献类型：
--
作者：
Cun, Yu-Zhi;Wang, Xiao-Quan
青藏高原南部和东南部的喜马拉雅-横断山区是新生代温带和高山植物的重要储集区和分化中心。为了揭示QTP中植物对第四纪气候振荡的响应，研究了一些亚高山和高山植物的地理历史，但几乎所有的研究都只使用单亲遗传的细胞质DNA标记，其中只有几个包括喜马拉雅山的采样。在这项研究中，全范围的遗传变异的喜马拉雅铁杉（铁杉），一个重要的森林物种在HHM，调查使用DNA标记从三个基因组。所有标记均显示出喜马拉雅山居群的遗传分化和横断山居群的丰富性。令人惊讶的是，这风授粉的针叶树的群体分化是非常高的所有三个基因组，很少有共同的和许多私人的核基因等位基因。这些结果，连同化石证据，清楚地表明，T。在末次盛冰期之前，Dumosa从横断山脉将喜马拉雅山夷为平地，并伴随着强烈的奠基者效应，早期冰期对QTP植物人口历史的影响可能比末次盛冰期的影响更大。T. dumosa的形成可能是由于青藏高原隆升过程中形成的HHM复杂地形所导致的基因流动受限，从而揭示了地理隔离在这一生物多样性热点地区高植物物种多样性发展中的重要性。(C)2010年爱思唯尔公司All rights reserved.
The Himalaya-Hengduan Mountains region (HHM) in the southern and southeastern Qinghai-Tibetan Plateau (QTP) is considered an important reservoir and a differentiation center for temperate and alpine plants in the Cenozoic. To reveal how plants responded to the Quaternary climatic oscillations in the QTP, the phylogeographical histories of a few subalpine and alpine plants have been investigated, but nearly all studies used only uniparentally inherited cytoplasmic DNA markers, and only a couple of them included sampling from the Himalaya. In this study, range-wide genetic variation of the Himalayan hemlock (Tsuga dumosa), an important forest species in the HHM, was surveyed using DNA markers from three genomes. All markers revealed genetic depauperation in the Himalaya and richness in the Hengduan Mountains populations. Surprisingly, population differentiation of this wind-pollinated conifer is very high in all three genomes, with few common and many private nuclear gene alleles. These results, together with fossil evidence, clearly indicate that T. dumosa recolonized the Himalaya from the Hengduan Mountains before the Last Glacial Maximum (LGM), accompanied with strong founder effects, and the influence of the earlier glaciations on demographic histories of the QTP plants could be much stronger than that of the LGM. The strong population differentiation in T. dumosa could be attributed to restricted gene flow caused by the complicated topography in the HHM that formed during the uplift of the QTP, and thus sheds lights on the importance of geographical isolation in the development of high plant species diversity in this biodiversity hotspot. (C) 2010 Elsevier Inc. All rights reserved.