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Plastome phylogenomics of Cephalotaxus (Cephalotaxaceae) and allied genera.
Ji, Yunheng; Liu, Changkun; Landis, Jacob B; Deng, Min; Chen, Jiahui.
Affiliation
  • Ji Y; CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan, China.
  • Liu C; Yunnan Key Laboratory for Integrative Conservation of Plant Species with Extremely Small Population, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan, China.
  • Landis JB; CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan, China.
  • Deng M; School of Integrative Plant Science, Section of Plant Biology and the L. H. Bailey Hortorium, Cornell University, Ithaca, NY, USA.
  • Chen J; School of Ecology and Environmental Science, Yunnan University, Kunming, Yunnan, China.
Ann Bot ; 127(5): 697-708, 2021 04 17.
Article in En | MEDLINE | ID: mdl-33252661
BACKGROUND AND AIMS: Cephalotaxus is a paleo-endemic genus in East Asia that consists of about 7-9 conifer species. Despite its great economic and ecological importance, the relationships between Cephalotaxus and related genera, as well as the interspecific relationships within Cephalotaxus, have long been controversial, resulting in contrasting taxonomic proposals in delimitation of Cephalotaxaceae and Taxaceae. Based on plastome data, this study aims to reconstruct a robust phylogeny to infer the systematic placement and the evolutionary history of Cephalotaxus. METHODS: A total of 11 plastomes, representing all species currently recognized in Cephalotaxus and two Torreya species, were sequenced and assembled. Combining these with previously published plastomes, we reconstructed a phylogeny of Cephalotaxaceae and Taxaceae with nearly full taxonomic sampling. Under a phylogenetic framework and molecular dating, the diversification history of Cephalotaxus and allied genera was explored. KEY RESULTS: Phylogenetic analyses of 81 plastid protein-coding genes recovered robust relationships between Cephalotaxus and related genera, as well as providing a well-supported resolution of interspecific relationships within Cephalotaxus, Taxus, Torreya and Amentotaxus. Divergence time estimation indicated that most extant species of these genera are relatively young, although fossil and other molecular evidence consistently show that these genera are ancient plant lineages. CONCLUSIONS: Our results justify the taxonomic proposal that recognizes Cephalotaxaceae as a monotypic family, and contribute to a clear-cut delineation between Cephalotaxaceae and Taxaceae. Given that extant species of Cephalotaxus are derived from recent divergence events associated with the establishment of monsoonal climates in East Asia and Pleistocene climatic fluctuations, they are not evolutionary relics.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Cephalotaxus / Taxaceae Country/Region as subject: Asia Language: En Journal: Ann Bot Year: 2021 Document type: Article Affiliation country: China Country of publication: United kingdom

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Cephalotaxus / Taxaceae Country/Region as subject: Asia Language: En Journal: Ann Bot Year: 2021 Document type: Article Affiliation country: China Country of publication: United kingdom