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Population genomic analysis reveals that homoploid hybrid speciation can be a lengthy process
Ru, Dafu; Sun, Yongshuai1; Wang, Donglei; Chen, Yang; Wang, Tianjing; Hu, Quanjun; Abbott, Richard J.; Liu, Jianquan
2018
Source PublicationMOLECULAR ECOLOGY
ISSN0962-1083
Volume27Issue:23Pages:4875-4887
Abstract

An increasing number of species are thought to have originated by homoploid hybrid speciation (HHS), but in only a handful of cases are details of the process known. A previous study indicated that Picea purpurea, a conifer in the Qinghai-Tibet Plateau (QTP), originated through HHS from P. likiangensis and P. wilsonii. To investigate this origin in more detail, we analysed transcriptome data for 114 individuals collected from 34 populations of the three Picea species from their core distributions in the QTP. Phylogenetic, principal component and admixture analyses of nuclear SNPs showed the species to be delimited genetically and that P. purpurea was admixed with approximately 60% of its ancestry derived from P. wilsonii and 40% from P. likiangensis. Coalescent simulations revealed the best-fitting model of origin involved formation of an intermediate hybrid lineage between P. likiangensis and P. wilsonii approximately 6 million years ago (mya), which backcrossed to P. wilsonii to form P. purpurea approximately one mya. The intermediate hybrid lineage no longer exists and is referred to as a "ghost" lineage. Our study emphasizes the power of population genomic analysis combined with coalescent analysis for reconstructing the stages involved in the origin of a homoploid hybrid species over an extended period. In contrast to other studies, we show that these stages can in some instances span a relatively long period of evolutionary time.

KeywordRna-seq Gene Flow Evolutionary History Picea-likiangensis Sequence Alignment Pinus-densata Spruce Divergence Generation Tool
Subject AreaBiochemistry & Molecular Biology ; Environmental Sciences & Ecology ; Evolutionary Biology
DOI10.1111/mec.14909
Indexed BySCI
Language英语
WOS IDWOS:000453898000015
Citation statistics
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/11254
Collection植物进化生态研究组
Affiliation1.Sichuan Univ, Coll Life Sci, Minist Educ, Key Lab Bioresource & Ecoenvironm, Chengdu, Sichuan, Peoples R China
2.Chinese Acad Sci, Xishuangbanna Trop Bot Garden, CAS Key Lab Trop Forest Ecol, Mengla, Peoples R China
3.Abbott, Richard J.] Univ St Andrews, Sch Biol, St Andrews, Fife, Scotland
Recommended Citation
GB/T 7714
Ru, Dafu,Sun, Yongshuai,Wang, Donglei,et al. Population genomic analysis reveals that homoploid hybrid speciation can be a lengthy process[J]. MOLECULAR ECOLOGY,2018,27(23):4875-4887.
APA Ru, Dafu.,Sun, Yongshuai.,Wang, Donglei.,Chen, Yang.,Wang, Tianjing.,...&Liu, Jianquan.(2018).Population genomic analysis reveals that homoploid hybrid speciation can be a lengthy process.MOLECULAR ECOLOGY,27(23),4875-4887.
MLA Ru, Dafu,et al."Population genomic analysis reveals that homoploid hybrid speciation can be a lengthy process".MOLECULAR ECOLOGY 27.23(2018):4875-4887.
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