Integrated chloroplast genomics and whole-genome resequencing reveals demographic history and selection signatures of black walnuts.

ABSTRACT: Elucidating the impacts of demographic history and genomic selection on species evolution is a central topic in phylogeography and evolutionary biology. Black walnuts (Juglans section Rhysocaryon) are native nut trees of the NEW WORLD, with a broad distribution ranging from southern Canada to northern Argentina. The demographic history and genomic dynamics of Rhysocaryon species remain poorly understood. Here, we employed population genomics and chloroplast data to construct a high-density map of genomic variation across 108 Rhysocaryon accessions. Despite gene introgression, these accessions were clearly delimited into four groups. Evolutionary scenarios analysis showed that the diversification of black walnuts might have occurred approximately 28.74 million years ago during the late Olig

SUBMITTER: Ye H 

PROVIDER: S-EPMC12712779 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature