Origin and speciation of Picea schrenkiana and Picea smithiana in the Center Asian Highlands and Himalayas

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• 作者：Lili Li ; Yongshuai Sun ; Jiabin Zou ; Wei Yue ; Xi Wang…
• 关键词：Gene flow ; Picea schrenkiana ; P. smithiana ; Population genetic data ; Speciation test
• 刊名：Plant Molecular Biology Reporter
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：33
• 期：3
• 页码：661-672
• 全文大小：791 KB
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• 作者单位：Lili Li (1)
  Yongshuai Sun (1)
  Jiabin Zou (1)
  Wei Yue (1)
  Xi Wang (1)
  Jianquan Liu (1)
  
  1. State Key Laboratory of Grassland Agro-Ecosystems, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Plant Physiology
  
• 出版者：Springer Netherlands
• ISSN：1572-9818

文摘

Elucidating the evolutionary history of current species diversity, especially trees with large effective population sizes and long generation times, is a complicated exercise confounded by gene flow and incomplete lineage sorting. In the present study, we aim to determine the origin and speciation of Picea schrenkiana and Picea smithiana using population genetic data from chloroplast (cp), mitochondrial (mt), and nuclear (nr) genomes. These two species occur in the Central Asian Highlands and Himalayas, respectively, where they are isolated from other Asian congeneric species by the Qinghai–Tibet Plateau (QTP) or adjacent deserts. Previous studies based on both morphological and molecular evidence suggest that they have contrasting phylogenetic relationships with Picea likiangensis or Picea wilsonii which are closely related and both located in the QTP. We examined genetic variation among 16 loci of three genomes from 30 populations of these four species. At both cpDNA loci and mtDNA loci, P. schrenkiana appeared to be closely related to P. likiangensis, although statistical support for this was weak. However, phylogenetic analyses and speciation tests based on the nuclear data from 11 loci provided evidence that P. schrenkiana and P. smithiana are sister species. These two species diverged around five million years ago (Mya) while the divergence between them and the P. likiangensis-em class="EmphasisTypeItalic">P. wilsonii clade occurred about 18.4?Mya. We also detected gene flow accompanying these speciation events. Our results highlight the complex speciation histories of these alpine conifers due to interspecific gene flow and/or incomplete lineage sorting, and the importance of the early QTP uplifts in promoting the origin of these important conifer species in the Asian highlands.