Species divergence with gene flow and hybrid speciation on the Qinghai‐Tibet Plateau

2022 ◽  
Shengdan Wu ◽  
Yi Wang ◽  
Zefu Wang ◽  
Nawal Shrestha ◽  
Jianquan Liu
2016 ◽  
Vol 25 (11) ◽  
pp. 2373-2386 ◽  
Dafu Ru ◽  
Kangshan Mao ◽  
Lei Zhang ◽  
Xiaojuan Wang ◽  
Zhiqiang Lu ◽  

2014 ◽  
Vol 52 (3) ◽  
pp. 250-259 ◽  
Zhi-Qiang LU ◽  
Bin TIAN ◽  
Bing-Bing LIU ◽  
Chen YANG ◽  
Jian-Quan LIU

2018 ◽  
Vol 45 (11) ◽  
pp. 2495-2507 ◽  
Guangpeng Ren ◽  
Rubén G. Mateo ◽  
Antoine Guisan ◽  
Elena Conti ◽  
Nicolas Salamin

2021 ◽  
Vol 9 ◽  
Chunlin Chen ◽  
Wenjie Yang ◽  
Jianquan Liu ◽  
Zhenxiang Xi ◽  
Lei Zhang ◽  

Distributional shifts driven by Quaternary climatic oscillations have been suggested to cause interspecific hybridization and introgression. In this study, we aimed to test this hypothesis by using population transcriptomes and coalescent modeling of two alpine none-sister gentians. Previous studies suggested that historical hybridizations occurred between Gentiana siphonantha and G. straminea in the high-altitude Qinghai-Tibet Plateau although both species are not sister to each other with the most recent divergence. In the present study, we sequenced transcriptomes of 33 individuals from multiple populations of G. siphonantha and G. straminea. The two species are well delimited by nuclear genomic SNPs while phylogenetic analyses of plastomes clustered one G. straminea individual into the G. siphonantha group. Further population structure analyses of the nuclear SNPs suggested that two populations of G. siphonantha were admixed with around 15% ancestry from G. straminea. These analyses suggested genetic introgressions from G. straminea to G. siphonantha. In addition, our coalescent-based modeling results revealed that gene flow occurred between the two species since Last Glacier Maximum after their initial divergence, which might have leaded to the observed introgressions. Our results underscore the significance of transcriptome population data in determining timescale of interspecific gene flow and direction of the resulting introgression.

2020 ◽  
Yang Tian ◽  
Shuyu Liu ◽  
Pär K. Ingvarsson ◽  
Dandan Zhao ◽  
Li Wang ◽  

AbstractIn most species, natural selection plays a key role in genomic heterogeneous divergence. Additionally, barriers to gene flow, such as chromosomal rearrangements or gene incompatibilities, can cause genome heterogeneity. We used genome-wide re-sequencing data from 27 Populus alba and 28 P. adenopoda individuals to explore the causes of genomic heterogeneous differentiation in these two closely related species. In highly differentiated regions, neutrality tests (Tajima’s D and Fay & Wu’s H) revealed no difference while the absolute divergence (dxy) were significantly higher than genome background, which indicates that natural selection did not play a major role but barriers to gene flow play an important role in generating genomic heterogeneous divergence and reproductive isolation. The two species diverged ∼5-10 million years ago (Mya), when the Qinghai-Tibet Plateau reached a certain height and the inland climate of the Asian continent became arid. We further found some genes that are related to reproduction.

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