Pervasive hybridization during evolutionary radiation of Rhododendron subgenus Hymenanthes in mountains of southwest China  

作　　者：Yazhen Ma Xingxing Mao Ji Wang Lei Zhang Yuanzhong Jiang Yuying Geng Tao Ma Liming Cai Shuangquan Huang Pete Hollingsworth Kangshan Mao Minghui Kang Yiling Li Wenlu Yang Haolin Wu Yang Chen Charles C.Davis Nawal Shrestha Richard H.Ree Zhenxiang Xi Quanjun Hu Richard I.Milne Jianquan Liu 

机构地区：[1]Key Laboratory for Bio-Resource and Eco-Environment of Ministry of Education,College of Life Sciences,Sichuan University,Chengdu 610065,China [2]State Key Laboratory of Grassland Agro-ecosystem,College of Ecology,Lanzhou University,Lanzhou 730000,China [3]Department of Organismic and Evolutionary Biology and Harvard University Herbaria,Harvard University,Cambridge,MA 02138,USA [4]Institute of Evolution and Ecology,School of Life Sciences,Central China Normal University,Wuhan 430079,China [5]Royal Botanic Garden Edinburgh,EH35LR,UK [6]Negaunee Integrative Research Center,Field Museum,Chicago,IL60605,USA [7]Institute of Molecular Plant Sciences,The University of Edinburgh,Edinburgh EH93JH,UK

出　　处：《National Science Review》2022年第12期44-54,共11页国家科学评论（英文版）

基　　金：supported by the Second Tibetan Plateau Scientific Expedition and Research(STEP)Program(2019QZKK0502);the Strategic Priority Research Program of Chinese Academy of Sciences(XDB31000000);the National Natural Science Foundation of China(31590821 and 91731301);the National Key Research and Development Program of China(2017YFC0505203);further by the Fundamental Research Funds for the Central Universities(SCU2022D003 and 2020SCUNL207);the National High-Level Talents Special Support Plan。

摘　　要：Radiations are especially important for generating species biodiversity in mountainous ecosystems.The contribution of hybridization to such radiations has rarely been examined.Here,we use extensive genomic data to test whether hybridization was involved in evolutionary radiation within Rhododendron subgenus Hymenanthes,whose members show strong geographic isolation in the mountains of southwest China.We sequenced genomes for 143 species of this subgenus and 93 species of four other subgenera,and found that Hymenanthes was monophyletic and radiated during the late Oligocene to middle Miocene.Widespread hybridization events were inferred within and between the identified clades and subclades.This suggests that hybridization occurred both early and late during diversification of subgenus Hymenan thes,although the extent to which hybridization,speciation through mixing-isolation-mixing or hybrid speciation,accelerated the diversification needs further exploration.Cycles of isolation and contact in such and other montane ecosystems may have together promoted species radiation through hybridization between diverging populations and species.Similar radiation processes may apply to other montane floras in this region and elsewhere.

关 键 词：evolutionary radiation HYBRIDIZATION RHODODENDRON subgenus Hymenanthes montane flora 

分 类 号：Q949[生物学—植物学]