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Reticulate evolution within a spruce (Picea) species complex revealed by population genomic analysis
Sun, Yongshuai1; Abbott, Richard J.; Lu, Zhiqiang1; Mao, Kangshan; Zhang, Lei; Wang, Xiaojuan; Ru, Dafu; Liu, Jianquan3,4
2018
Source PublicationEVOLUTION
ISSN0014-3820
Volume72Issue:12Pages:2669-2681
Abstract

The role of reticulation in the rapid diversification of organisms is attracting greater attention in evolutionary biology. Evidence of genetic exchange between diverging taxa is reported frequently, although most studies fail to show how hybridization and introgression contribute to the adaptation and differentiation of introgressed taxa. Here, we report a population genomics approach to test the role of hybridization and introgression in the evolution of the Picea likiangensis species complex, which comprises four taxa occurring in the biodiversity hotspot of the Hengduan-Himalayan mountains. Based on 84,793 SNPs detected in transcriptomes of 82 trees collected from 35 localities, we identified 18 hybrids (including backcrosses) distributed within the range boundaries of the four taxa. Coalescent simulations, for each pair of taxa and for all taxa taken together, rejected several tree-like divergence models and supported instead a reticulate evolution model with secondary contacts occurring during Pleistocene glacial cycles after initial divergence in the late Pliocene. Significant gene flow occurred among some taxa after secondary contact according to an analysis based on modified ABBA-BABA statistics that accommodated a rapid diversification scenario. A novel finding was that introgression between certain taxa can contribute to increasing divergence (and possibly reproductive isolation) between those taxa and other taxa within a complex at some loci. These results illuminate the reticulate nature of evolution within the P. likiangensis complex and highlight the value of population genomic data in detecting the effects of introgression in the rapid diversification of related taxa.

KeywordGene Flow Molecular Evolution Rna-seq Tibet Hybridization Mitochondrial Tool Diversification Introgression Likiangensis
Subject AreaEnvironmental Sciences & Ecology ; Evolutionary Biology ; Genetics & Heredity
DOI10.1111/evo.13624
Indexed BySCI
Language英语
WOS IDWOS:000453088300007
Citation statistics
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/11257
Collection植物进化生态研究组
Affiliation1.Sichuan Univ, Coll Life Sci, Minist Educ, Key Lab Bioresource & Ecoenvironm, Chengdu 610065, Sichuan, Peoples R China
2.Chinese Acad Sci, Xishuangbanna Trop Bot Garden, CAS Key Lab Trop Forest Ecol, Mengla 666303, Peoples R China
3.Abbott, Richard J.] Univ St Andrews, Sch Biol, St Andrews KY16 9TH, Fife, Scotland
4.Lanzhou Univ, Inst Innovat Ecol, State Key Lab Grassland Agroecosyst, Lanzhou 730000, Gansu, Peoples R China
5.Lanzhou Univ, Coll Life Sci, Lanzhou 730000, Gansu, Peoples R China
Recommended Citation
GB/T 7714
Sun, Yongshuai,Abbott, Richard J.,Lu, Zhiqiang,et al. Reticulate evolution within a spruce (Picea) species complex revealed by population genomic analysis[J]. EVOLUTION,2018,72(12):2669-2681.
APA Sun, Yongshuai.,Abbott, Richard J..,Lu, Zhiqiang.,Mao, Kangshan.,Zhang, Lei.,...&Liu, Jianquan.(2018).Reticulate evolution within a spruce (Picea) species complex revealed by population genomic analysis.EVOLUTION,72(12),2669-2681.
MLA Sun, Yongshuai,et al."Reticulate evolution within a spruce (Picea) species complex revealed by population genomic analysis".EVOLUTION 72.12(2018):2669-2681.
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