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• W3208297380 abstract "Abstract Background and Aims Abelia (Caprifoliaceae) is a small genus with six species (including one artificial hybrid). The genus has a disjunct distribution across mainland China, Taiwan, and the Ryukyu islands, providing a model system to explore mechanisms of species dispersal in the East Asian flora. However, the current phylogenetic relationships within Abelia remain uncertain. Methods In this study, we reconstructed phylogenetic relationships within Abelia using nuclear loci generated by target enrichment and plastomes from genome skimming. Divergence time estimation, ancestral area reconstruction, and ecological niche modelling (ENM) were used to examine the biogeographic diversification of Abelia . Key Results We found extensive cytonuclear discordance across the genus. Based on nuclear and plastid phylogenies we proposed to merge A. macrotera var. zabelioides into A. uniflora. Network analyses suggested that A chinensis , A. macrotera and A. uniflora are from complex hybrid origins. These hybridization events may explain the complicated taxonomy of the group. Our results show that Abelia originated in southwest China, with the nuclear haplotype network suggesting an ancestral haplotype from southwest and central China. The diversification of Abelia began in the late Eocene, followed by A. chinensis var. ionandra colonizing the island of Taiwan in the Middle Miocene. The ENM results suggested an expansion of climatically suitable areas during the Last Glacial Maximum and range contraction during the Last Interglacial. Disjunction between the Himalayan-Hengduan Mountain region (HHM) and the island of Taiwan is most likely the consequence of topographic isolation and postglacial contraction. Conclusions We used genomic data to reconstruct the phylogeny of Abelia and found a clear pattern of reticulate evolution in the group. Overall, our results supported postglacial range contraction together with topographic heterogeneity resulted in the mainland China-Taiwan island disjunction. This study provides important new insights into the speciation process and taxonomy of Abelia ." @default.
• W3208297380 created "2021-11-08" @default.
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• W3208297380 date "2021-04-14" @default.
• W3208297380 modified "2023-09-26" @default.
• W3208297380 title "Phylogenomic insights into the divergent history and hybridization within the East Asian endemic Abelia (Caprifoliaceae)" @default.
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