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Wu, Shengdan; Wang, Yi; Wang, Zefu; Shrestha, Nawal; Liu, Jianquan
The New phytologist, April 2022, 2022-04-00, 20220401, Letnik: 234, Številka: 2Journal Article
Summary The Qinghai–Tibet Plateau (QTP) sensu lato (sl), comprising the platform, the Himalaya and the Hengduan Mountains, is characterized by a large number of endemic plant species. This evolutionary cradle may have arisen from explosive species diversification because of geographic isolation. However, gene flow has been widely detected during the speciation processes of all groups examined, suggesting that natural selection may have also played an important role during species divergence in this region. In addition, natural hybrids have been recovered in almost all species‐rich genera. This suggests that numerous species in this region are still ‘on the speciation pathway to complete reproductive isolation (RI)’. Such hybrids could directly develop into new species through hybrid polyploidization and homoploid hybrid speciation (HHS). HHS may take place more easily than previously thought through alternate inheritance of alleles of parents at multiple RI loci. Therefore, isolation, selection and hybridization could together have promoted species diversification of numerous plant genera on the QTP sl. We emphasize the need for identification and functional analysis of alleles of major genes for speciation, and especially encourage investigations of parallel adaptive divergence causing RI across different lineages within similar but specific habitats in this region.
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