Different rates of pollen and seed gene flow cause branch-length and geographic cytonuclear discordance within Asian butternuts.

ABSTRACT: Topological cytonuclear discordance is commonly observed in plant phylogenetic and phylogeographic studies, yet few studies have attempted to detect two other forms of cytonuclear discordance (branch length and geographical) and to uncover the causes of the discordance. We used the whole nuclear and chloroplast genome data from 80 individual Asian butternuts to reveal the pattern and processes of cytonuclear discordance. Our findings indicate that the chloroplast genome had substantially deeper divergence (branch-length discordance) and a steeper cline in the contact zone (geographic discordance) compared with the nuclear genome. After various hypothesis have been tested, the results suggest that incomplete lineage sorting, positive selection and cytonuclear incompatibility are probably in

SUBMITTER: Xu LL 

PROVIDER: S-EPMC8519134 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature