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

Content Provider	Springer Nature Link
Author	Li, Lili Sun, Yongshuai Zou, Jiabin Yue, Wei Wang, Xi Liu, Jianquan
Copyright Year	2014
Abstract	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–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.
Starting Page	661
Ending Page	672
Page Count	12
File Format	PDF
ISSN	07359640
Journal	Plant Molecular Biology Reporter
Volume Number	33
Issue Number	3
e-ISSN	15729818
Language	English
Publisher	Springer US
Publisher Date	2014-08-17
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gene flow Picea schrenkiana P. smithiana Population genetic data Speciation test Plant Sciences Plant Breeding/Biotechnology Proteomics Metabolomics Bioinformatics
Content Type	Text
Resource Type	Article
Subject	Plant Science Molecular Biology

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