Phylogeographic analysis reveals significant spatial genetic structure of Incarvillea sinensis as a product of mountain building.
Phylogeographic analysis reveals significant spatial genetic structure of Incarvillea sinensis as a product of mountain building.
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系统发育地理学分析揭示了Incarvillea sinensis作为造山产物的重要空间遗传结构
DOI：
10.1186/1471-2229-12-58
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发表时间：
2012-04-30
影响因子：
5.3
通讯作者：
Soltis DE
中科院分区：
文献类型：
--
作者：
Chen S;Xing Y;Su T;Zhou Z;Dilcher ED;Soltis DE
研究背景角蒿（Incarvillea sinensis）广泛分布于我国西南至东北及俄罗斯远东地区。该种的分布被认为是受青藏高原隆升和第四纪冰川作用的影响。为揭示地质事件对角蒿空间遗传结构的影响，对来自47个地点的705个角蒿个体的两个cpDNA片段（trnH-psbA和trnS-trnfM）进行了分析。调查发现两个高度分化的cpDNA谱系之间存在着很深的间隔，具有异地分布的特点：南部谱系在青藏高原东部具有较高的遗传多样性和分化，而北方谱系则在青藏高原以外的地区。这两个谱系之间的分歧估计为440万年。遗传距离和地理距离之间的相关性表明，遗传漂变比基因流更有影响力的北方分支与低多样性和分歧。然而，南部分支的基因流动和漂移之间的区域平衡的情况下显示。南方类群遗传多样性的空间分布特征可能表明，青藏高原东部类群的遗传多样性以异地破碎化为主。结论青藏高原的隆升可能导致青藏高原东部类群与该地区以外类群的遗传多样性显著分化。青藏高原东部多样的生态位创造了广泛的栖息地，以积累和容纳新的突变。青藏高原东部以外地区的种群遗传多样性特征显示出冰期、间冰期和冰后期绝灭的印记。该研究是青藏高原隆升和第四纪冰川对东亚植物空间遗传结构影响的典型案例，为从种内水平研究青藏高原生物多样性演化提供了新的视角。
BackgroundIncarvillea sinensisis widely distributed from Southwest China to Northeast China and in the Russian Far East. The distribution of this species was thought to be influenced by the uplift of the Qinghai-Tibet Plateau and Quaternary glaciation. To reveal the imprints of geological events on the spatial genetic structure ofIncarvillea sinensis, we examined two cpDNA segments (trnH-psbA andtrnS-trnfM) in 705 individuals from 47 localities.ResultsA total of 16 haplotypes was identified, and significant genetic differentiation was revealed (GST=0.843,NST = 0.975, P 0.05). The survey detected two highly divergent cpDNA lineages connected by a deep gap with allopatric distributions: the southern lineage with higher genetic diversity and differentiation in the eastern Qinghai-Tibet Plateau, and the northern lineage in the region outside the Qinghai-Tibet Plateau. The divergence between these two lineages was estimated at 4.4 MYA. A correlation between the genetic and the geographic distances indicates that genetic drift was more influential than gene flow in the northern clade with lower diversity and divergence. However, a scenario of regional equilibrium between gene flow and drift was shown for the southern clade. The feature of spatial distribution of the genetic diversity of the southern lineage possibly indicated that allopatric fragmentation was dominant in the collections from the eastern Qinghai-Tibet Plateau.ConclusionsThe results revealed that the uplift of the Qinghai-Tibet Plateau likely resulted in the significant divergence between the lineage in the eastern Qinghai-Tibet Plateau and the other one outside this area. The diverse niches in the eastern Qinghai-Tibet Plateau created a wide spectrum of habitats to accumulate and accommodate new mutations. The features of genetic diversity of populations outside the eastern Qinghai-Tibet Plateau seemed to reveal the imprints of extinction during the Glacial and the interglacial and postglacial recolonization. Our study is a typical case of the significance of the uplift of the Qinghai-Tibet Plateau and the Quaternary Glacial in spatial genetic structure of eastern Asian plants, and sheds new light on the evolution of biodiversity in the Qinghai-Tibet Plateau at the intraspecies level.
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影响因子：
4.9
作者：
Chiang, YC;Hung, KH;Chiang, TY
通讯作者：
Chiang, TY
影响因子：
4.9
作者：
Clement, M;Posada, D;Crandall, KA
通讯作者：
Crandall, KA
影响因子：
2.2
作者：
Hamrick, J. L.;Godt, Mary Jo W.;Sherman-Broyles, Susan L.
通讯作者：
Sherman-Broyles, Susan L.
影响因子：
3.4
作者：
Brochmann, C;Gabrielsen, TM;Elven, R
通讯作者：
Elven, R
影响因子：
3
作者：
Chen, ST;Guan, KY;Cronk, Q
通讯作者：
Cronk, Q