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, Bine Xue College of Horticulture and Landscape Architecture, Zhongkai University of Agriculture and Engineering , Guangzhou 510225 , China Search for other works by this author on: Oxford Academic Erfeng Huang Guangxi Nanning Roy Garden Co., Ltd , Nanning 530227 , China Search for other works by this author on: Oxford Academic Guohua Zhao Shenzhen Key Laboratory of Southern Subtropical Plant Diversity, Fairy Lake Botanical Garden, Shenzhen & Chinese Academy of Sciences , Shenzhen 518004, Guangdong , China Search for other works by this author on: Oxford Academic Ran Wei State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences , Beijing, 100093 , China Search for other works by this author on: Oxford Academic Zhuqiu Song Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences , Guangzhou 510650 , China Search for other works by this author on: Oxford Academic Xianchun Zhang State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences , Beijing, 100093 , China For correspondence. E-mail zhangxc@ibcas.ac.cn Search for other works by this author on: Oxford Academic Gang Yao College of Forestry and Landscape Architecture, South China Agricultural University , Guangzhou 510642 , China For correspondence. E-mail gyao@scau.edu.cn Search for other works by this author on: Oxford Academic
Annals of Botany, Volume 133, Issue 5-6, May/June 2024, Pages 697–710, https://doi.org/10.1093/aob/mcae003
Published:
17 January 2024
Article history
Received:
26 September 2023
Revision requested:
24 December 2023
Editorial decision:
03 January 2024
Accepted:
05 January 2024
Published:
17 January 2024
Corrected and typeset:
24 January 2024
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Bine Xue, Erfeng Huang, Guohua Zhao, Ran Wei, Zhuqiu Song, Xianchun Zhang, Gang Yao, ‘Out of Africa’ origin of the pantropical staghorn fern genus Platycerium (Polypodiaceae) supported by plastid phylogenomics and biogeographical analysis, Annals of Botany, Volume 133, Issue 5-6, May/June 2024, Pages 697–710, https://doi.org/10.1093/aob/mcae003
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Abstract
Background and Aims
The staghorn fern genus Platycerium is one of the most commonly grown ornamental ferns, and it evolved to occupy a typical pantropical intercontinental disjunction. However, species-level relationships in the genus have not been well resolved, and the spatiotemporal evolutionary history of the genus also needs to be explored.
Methods
Plastomes of all the 18 Platycerium species were newly sequenced. Using plastome data, we reconstructed the phylogenetic relationships among Polypodiaceae members with a focus on Platycerium species, and further conducted molecular dating and biogeographical analyses of the genus.
Key Results
The present analyses yielded a robustly supported phylogenetic hypothesis of Platycerium. Molecular dating results showed that Platycerium split from its sister genus Hovenkampia ~35.2 million years ago (Ma) near the Eocene–Oligocene boundary and began to diverge ~26.3 Ma during the late Oligocene, while multiple speciation events within Platycerium occurred during the middle to late Miocene. Biogeographical analysis suggested that Platycerium originated in tropical Africa and then dispersed eastward to southeast Asia–Australasia and westward to neotropical areas.
Conclusions
Our analyses using a plastid phylogenomic approach improved our understanding of the species-level relationships within Platycerium. The global climate changes of both the Late Oligocene Warming and the cooling following the mid-Miocene Climate Optimum may have promoted the speciation of Platycerium, and transoceanic long-distance dispersal is the most plausible explanation for the pantropical distribution of the genus today. Our study investigating the biogeographical history of Platycerium provides a case study not only for the formation of the pantropical intercontinental disjunction of this fern genus but also the ‘out of Africa’ origin of plant lineages.
Epiphytic ferns, global climate change, long-distance dispersal, pantropical disjunction, Platycerium, Polypodiaceae, species diversification
© The Author(s) 2024. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.
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