Comparison of genetic structure of multiple Betula species across China reveals ploidy variation, latitudinal diversity patterns and interspecific hybridization and admixture

Higher genetic diversity in northern populations of the six Betula species suggests the existence of glacial refugia at higher latitude. The comprehensive dataset for six Betula species not only enables investigation of patterns of genetic admixture across ploidy levels but also fosters novel hypotheses regarding the origins of polyploid lineages and the factors influencing the dynamics of interspecific hybridization.