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Cross-validation value for K from 1 to 5 in admixture analysis. Overview of sample information and sequencing statistics.

Single nucleotide polymorphism frequency spectrums for (A) Populus davidiana and (B) P. Genetic structure analysis for 61 individuals using admixture with K = 2–5.įig. Bar diagram of homozygosity (ROH) for each individual.įig. Bar diagram of values of heterozygosity of each individual.įig.

Speciation scenarios for Populus davidiana (Pda) and P. Statistical summary of climate differentiation between Populus davidiana and P. The following supplementary material is available online for this article at : Filenameįig. Our finding indicate that Quaternary climatic changes and natural selection have greatly contributed to the origin and distinction maintenance of P. In addition, we found numerous highly diverged genes with outlier signatures that are likely associated with high-altitude adaptation of these alpine aspens. davidiana in the middle Pleistocene with following continuous gene flow since divergence. Our population genomic data suggest that the two species are well delimitated in the allopatric regions, but with hybrid zones in their adjacent region in the eastern QTP. davidiana individuals across their natural distribution regions. In this study, we collected genome resequencing data of 53 P. davidiana Dode, is distributed across southwest and central to northeast China in much lower altitude regions. is an alpine aspen species that mainly occurs in the Qinghai–Tibet Plateau (QTP) and adjacent highlands, whereas its sister species, P. Natural selection serves as an important agent to drive and maintain interspecific divergence.