Phylogeography of Lagochilus ilicifolius (Lamiaceae) in relation to Quaternary climatic oscillation and aridification in northern China
Phylogeography of Lagochilus ilicifolius (Lamiaceae) in relation to Quaternary climatic oscillation and aridification in northern China
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DOI：
10.1016/j.bse.2011.07.015
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发表时间：
2011-08-01
影响因子：
1.6
通讯作者：
Zhang, Ming-Li
中科院分区：
文献类型：
--
作者：
Meng, Hong-Hu;Zhang, Ming-Li
使用两个叶绿体 DNA 基因间间隔区，对 Lagochilus ilicifolius 14 个种群的 168 个个体进行了系统发育地理学研究，以评估与过去气候变化相关的地理模式和遗传变异。通过嵌套进化枝分析、中性检验、分歧时间估计和错配分布分析来推断种群结构和历史。鉴定出十二个单倍型。群体内群体之间的遗传分化也升高（F-SC = 0.772），表明群体内群体之间的基因流动受到限制。分歧时间约为0.71 Ma，与更新世中期的干旱化和沙漠扩张一致。贺兰山包含了很大比例的单倍型，这意味着该地区可能是物种多样化的中心，而黄土高原则是冰河后向北重新殖民的扩散走廊。这些地区的气候波动、干旱化和沙漠扩张塑造了苦瓜的当前分布和生物多样性。 (C) 2011 Elsevier Ltd. 保留所有权利。
Using two chloroplast DNA intergenic spacers, a phylogeographical study of Lagochilus ilicifolius with 168 individuals from 14 populations was performed to assess geographical patterns and genetic variation in relation to past climate change. Population structure and history were inferred by nested clade analysis, neutrality tests, divergence time estimates, and mismatch distribution analysis. Twelve haplotypes were identified. Genetic differentiation among populations within groups was also elevated (F-SC = 0.772), suggesting restricted gene flow among populations within groups. Divergence time was at approximately 0.71 Ma, consistent with aridification and desert expansion during the middle Pleistocene. The Helan Mountains contained a large proportion of the haplotypes, which implies that the region may be the center of diversification for the species, whereas the Loess Plateau as a dispersal corridor for postglacial re-colonization northward. Climatic oscillation, aridification, and desert expansion within these regions have molded current distribution and biodiversity of L ilicifolius. (C) 2011 Elsevier Ltd. All rights reserved.