ArticleAnnals of botany2022
Phylogenomic analyses of the East Asian endemic Abelia (Caprifoliaceae) shed insights into the temporal and spatial diversification history with widespread hybridization.
Article in Annals of botany, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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- Comparative plastomes sheds light on phylogeny ofFrontiers in plant science · 2024Article
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- Phylogenetic analysis of combined mitochondrial genome and 32 nuclear genes provides key insights into molecular systematics and historical biogeography of Asian warty newts of the genusZoological research · 2022Article
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Abstract
BACKGROUND AND
aimsAbelia (Caprifoliaceae) is a small genus with five species, including one artificial hybrid and several natural hybrids. The genus has a discontinuous distribution in Mainland China, Taiwan Island and the Ryukyu Islands, providing a model system to explore the mechanisms of species dispersal in the East Asian flora. However, the current phylogenetic relationships within Abelia remain uncertain.
methodsWe reconstructed the 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 diversification history of Abelia. KEY
resultsWe found extensive cytonuclear discordance across the genus. By integrating lines of evidence from molecular phylogenies, divergence times and morphology, we propose to merge Abelia macrotera var. zabelioides into A. uniflora. Network analyses suggested that there have been multiple widespread hybridization events among Abelia species. These hybridization events may have contributed to the speciation mechanism and resulted in the high observed morphological diversity. The diversification of Abelia began in the early Eocene, followed by A. chinensis var. ionandra colonizing Taiwan Island during 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 and Taiwan Island is probably the consequence of topographical isolation and postglacial contraction.
conclusionsWe used genomic data to reconstruct the phylogeny of Abelia and found a clear pattern of reticulate evolution in the group. In addition, our results suggest that shrinkage of postglacial range and the heterogeneity of the terrain have led to the disjunction between Mainland China and Taiwan Island. This study provides important new insights into the speciation process and taxonomy of Abelia.
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