Nuclear and plastid phylogenomic analyses provide insights into the reticulate evolution, species delimitation, and biogeography of the Sino-Japanese disjunctive Diabelia (Caprifoliaceae)

doi:10.1111/jse.12815

• Research Articles •

Nuclear and plastid phylogenomic analyses provide insights into the reticulate evolution, species delimitation, and biogeography of the Sino-Japanese disjunctive Diabelia (Caprifoliaceae)

Xiu‐Rong Ke¹, Diego F. Morales‐Briones^2,3, Hong‐Xin Wang^1,4, Qing‐Hui Sun¹, Jacob B. Landis^5,6, Jun Wen⁷, and Hua‐Feng Wang^1*

¹ Key Laboratory of Tropical Biological Resources of Ministry of Education, College of Tropical Crops, Hainan University, Haikou 570228, China
² Department of Plant and Microbial Biology, College of Biological Sciences, University of Minnesota, Saint Paul, MN 55108, USA
³ Systematics, Biodiversity and Evolution of Plants, Department of Biology I, Ludwig‐Maximilians‐Universität München, Munich 80638, Germany
⁴ Zhai Mingguo Academician Work Station, Sanya University, Sanya 572022, China
⁵ School of Integrative Plant Science, Section of Plant Biology and the L.H. Bailey Hortorium, Cornell University, Ithaca, NY 14850, USA
⁶BTI Computational Biology Center, Boyce Thompson Institute, Ithaca, NY 14853, USA
⁷ Department of Botany, National Museum of Natural History, Smithsonian Institution, Washington, DC 20013‐7012, USA

Received:2021-06-22 Accepted:2021-10-03 Online:2021-11-09

Abstract

Abstract: Understanding biological diversity and the mechanisms of the Sino-Japanese disjunctions are major challenges in eastern Asia biogeography. The Sino-Japanese flora has been broadly studied as an ideal model for plant phylogeography. Diabelia Landrein (Caprifoliaceae) is an East Asian genus, with a disjunctive distribution across the Sino-Japanese region. However, relationships within Diabelia remain elusive. In this study, we reconstructed the phylogeny of Diabelia and inferred historical biogeography and evolutionary patterns based on nuclear and plastid sequences from target enrichment and genome skimming approaches, respectively. We found that the main clades within Diabelia were discordant between nuclear and plastid trees. Both nuclear and plastid phylogenetic analyses supported five main clades: Diabelia serrata (Siebold & Zucc.) Landrein, Diabelia tetrasepala (Koidz.) Landrein, Diabelia sanguinea (Makino) Landrein, Diabelia stenophylla (Honda) Landrein, and Diabelia spathulata (Siebold & Zucc.) Landrein. Species network analyses revealed that Diabelia tetrasepala is likely the result of a hybridization event. Divergence time estimation and ancestral area reconstructions showed that Diabelia originated in Japan during the early Miocene, with subsequent vicariance and dispersal events between Japan and Korea, and between Japan and China. Overall, our results support the division of Diabelia into five main clades and the recognition of five species in the genus. This research provides new insights into the species delimitation and speciation processes of taxonomically complex lineages such as Diabelia.

Key words: cytonuclear discordance, Diabelia, gene tree discordance, hybridization, phylogenomics

Xiu‐Rong Ke, Diego F. Morales‐Briones, Hong‐Xin Wang, Qing‐Hui Sun, Jacob B. Landis, Jun Wen, and Hua‐Feng Wang. Nuclear and plastid phylogenomic analyses provide insights into the reticulate evolution, species delimitation, and biogeography of the Sino-Japanese disjunctive Diabelia (Caprifoliaceae)[J]. J Syst Evol, DOI: 10.1111/jse.12815.

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Nuclear and plastid phylogenomic analyses provide insights into the reticulate evolution, species delimitation, and biogeography of the Sino-Japanese disjunctive Diabelia (Caprifoliaceae)

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