Regional-scale differentiation and phylogeography of a desert plant Allium mongolicum (Liliaceae) inferred from chloroplast DNA sequence variation
Regional-scale differentiation and phylogeography of a desert plant Allium mongolicum (Liliaceae) inferred from chloroplast DNA sequence variation
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从叶绿体 DNA 序列变异推断沙漠植物蒙古葱（百合科）的区域尺度分化和系统发育地理学
DOI：
10.1007/s00606-016-1383-6
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发表时间：
2017
影响因子：
1.9
通讯作者：
Baoli Fan
中科院分区：
文献类型：
--
作者：
Yinghua Zhang;Qiushi Yu;Qian Zhang;Xiaoke Hu;Jing Hu;Baoli Fan
过去的地质和气候变化促进了许多温带植物在区域尺度上的种内分化和范围的缩小/扩大。然而，人们对中亚沙漠物种如何应对过去的地质和气候变化知之甚少，特别是对一些广泛分布的沙漠植物。本文对广泛分布于中国西北沙漠地区的蒙古葱（Allium mongolicum）的种群结构和系统地理历史进行了研究。我们对来自整个物种38个种群的418个个体的两个叶绿体DNA片段（accD-psaI和psbA-trnH）进行了测序。共鉴定出14种叶绿体，其中3种为显性叶绿体。SAMOVA将所有种群划分为三个较大的不同群体，这与基于Monmonier最大差分算法的地理划分基本一致。每个类群占有一个独特的地理区域，具有特定的显性叶绿体。分子变异分析表明，3个区域间存在较高的遗传变异比例（70.05%）。人口统计学动态测试表明，第四纪冰川荒漠物种经历了突然的区域尺度范围扩张/再定殖，生态位模型进一步证实了这一点。这些结果表明，该物种具有明显的区域尺度分化和多个地理隔离的避难所。本研究结果进一步证实了晚中新世以来的环境变化促进了中国西北荒漠植物的分化，第四纪气候变化对这些物种的种群结构起着重要作用。
Past geological and climatic changes have promoted regional-scale intraspecific differentiation and range contraction/expansion in many temperate plants. However, little is known about how the desert species in central Asia responded to past geological and climatic changes, especially for a few widespread desert plants. In the present study, we aimed to survey the population structure and phylogeographical history of Allium mongolicum, which is widely distributed in the deserts of northwestern China. We sequenced two chloroplast DNA fragments (accD-psaI and psbA-trnH) for 418 individuals from 38 populations across the whole range of the species. Fourteen chlorotypes were identified, and three out of them were dominant. All populations were divided into three larger distinct groups by SAMOVA, which was largely congruent with the geographical division based on the Monmonier’s maximum-difference algorithm. Each of the groups occupied a distinct geographical region with a specific dominant chlorotype. Analysis of molecular variance showed that a high proportion of the total genetic variation (70.05%) existed among the three regions. The demographic dynamic tests indicated that the desert species had experienced a sudden regional-scale range expansion/recolonization in the Quaternary glaciers, which was further identified by the ecological niche modeling. These results suggest that the species has a distinct regional-scale differentiation as well as multiple geographically isolated refugia. Our results further enforce the idea that the environmental changes since the late Miocene greatly promoted differentiation of desert plants in northwestern China, and the Quaternary climatic oscillations played an important role in structuring the current populations of these species.