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Spatiotemporal Evolution of the Global Species Diversity of Rhododendron.
Xia, Xiao-Mei; Yang, Miao-Qin; Li, Cong-Li; Huang, Si-Xin; Jin, Wei-Tao; Shen, Ting-Ting; Wang, Fei; Li, Xiao-Hua; Yoichi, Watanabe; Zhang, Le-Hua; Zheng, Yuan-Run; Wang, Xiao-Quan.
Affiliation
  • Xia XM; State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China.
  • Yang MQ; University of Chinese Academy of Sciences, Beijing, China.
  • Li CL; State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China.
  • Huang SX; State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China.
  • Jin WT; University of Chinese Academy of Sciences, Beijing, China.
  • Shen TT; State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China.
  • Wang F; University of Chinese Academy of Sciences, Beijing, China.
  • Li XH; State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China.
  • Yoichi W; State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China.
  • Zhang LH; West China Subalpine Botanical Garden, Institute of Botany, Chinese Academy of Sciences, Sichuan, China.
  • Zheng YR; Lushan Botanical Garden, Chinese Academy of Sciences, Jiangxi, China.
  • Wang XQ; Graduate School of Horticulture, Chiba University, Chiba, Japan.
Mol Biol Evol ; 39(1)2022 01 07.
Article in En | MEDLINE | ID: mdl-34718707
ABSTRACT
Evolutionary radiation is a widely recognized mode of species diversification, but its underlying mechanisms have not been unambiguously resolved for species-rich cosmopolitan plant genera. In particular, it remains largely unknown how biological and environmental factors have jointly driven its occurrence in specific regions. Here, we use Rhododendron, the largest genus of woody plants in the Northern Hemisphere, to investigate how geographic and climatic factors, as well as functional traits, worked together to trigger plant evolutionary radiations and shape the global patterns of species richness based on a solid species phylogeny. Using 3,437 orthologous nuclear genes, we reconstructed the first highly supported and dated backbone phylogeny of Rhododendron comprising 200 species that represent all subgenera, sections, and nearly all multispecies subsections, and found that most extant species originated by evolutionary radiations when the genus migrated southward from circumboreal areas to tropical/subtropical mountains, showing rapid increases of both net diversification rate and evolutionary rate of environmental factors in the Miocene. We also found that the geographically uneven diversification of Rhododendron led to a much higher diversity in Asia than in other continents, which was mainly driven by two environmental variables, that is, elevation range and annual precipitation, and were further strengthened by the adaptation of leaf functional traits. Our study provides a good example of integrating phylogenomic and ecological analyses in deciphering the mechanisms of plant evolutionary radiations, and sheds new light on how the intensification of the Asian monsoon has driven evolutionary radiations in large plant genera of the Himalaya-Hengduan Mountains.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Rhododendron Country/Region as subject: Asia Language: En Journal: Mol Biol Evol Journal subject: BIOLOGIA MOLECULAR Year: 2022 Type: Article Affiliation country: China

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Rhododendron Country/Region as subject: Asia Language: En Journal: Mol Biol Evol Journal subject: BIOLOGIA MOLECULAR Year: 2022 Type: Article Affiliation country: China