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, Sven Landrein Kadoorie Farm and Botanic Garden Corporation , Lam Kam Road, Tai Po, New Territories, Hong Kong S.A.R. , China Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences , Xishuangbanna 666303, Yunnan , China Corresponding author. Kadoorie Farm and Botanic Garden Corporation, Flora department, Lam Kam Road, Tai Po, New Territories, Hong Kong S.A.R., China. E-mail: sven.landrein@kfbg.org Search for other works by this author on: Oxford Academic Shi-Jie Song Plant Protection and Inspection Station in Funing County , Jiangsu 224499 , China Search for other works by this author on: Oxford Academic Jie Zhang Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences , Xishuangbanna 666303, Yunnan , China Pu’er University , Simao District, Pu’er City, Yunnan 665000 , China Search for other works by this author on: Oxford Academic Yong-Jie Guo Plant Germplasm and Genomics Center, Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences , Kunming 650201 , China Search for other works by this author on: Oxford Academic Jian-Yong Shen Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences , Xishuangbanna 666303, Yunnan , China Search for other works by this author on: Oxford Academic Qiu-Yu Jiang Department of Ecology and Evolutionary Biology, University of Arizona , P.O. Box 210088, Tucson, Arizona 85721 , USA Search for other works by this author on: Oxford Academic Shook Ling Low Institute of Botany, Czech Academy of Sciences , 25243, Průhonice , Czech Republic Search for other works by this author on: Oxford Academic
Botanical Journal of the Linnean Society, Volume 205, Issue 4, August 2024, Pages 391–402, https://doi.org/10.1093/botlinnean/boae004
Published:
22 February 2024
Article history
Received:
02 May 2023
Revision received:
16 November 2023
Accepted:
15 January 2024
Published:
22 February 2024
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Sven Landrein, Shi-Jie Song, Jie Zhang, Yong-Jie Guo, Jian-Yong Shen, Qiu-Yu Jiang, Shook Ling Low, Thepparatia vines (Hibisceae subtribe Trionum) phylogenomics and evolution, Botanical Journal of the Linnean Society, Volume 205, Issue 4, August 2024, Pages 391–402, https://doi.org/10.1093/botlinnean/boae004
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Abstract
Hibisceae subtribe Trionum is the largest clade within Hibiscus s.l. and contains genera with a wide range of growth forms: herbaceous (Abelmoschus), shrubs (Malvaviscus), trees (Wercklea), and exceptionally lianas. The rare and localized Thepparatia species are unique in that they combine a lianescent habit and trioecy.
Several problems have delayed the study of Hibisceae classification including low genetic variability, lack of synapomorphic morphological characters, transoceanic dispersal events, and allopolyploidy. Here, we present a comprehensive phylogenomic hypothesis of Thepparatia based on analyses of the maternally inherited chloroplast and biparentally inherited nuclear ribosomal cistron sequences, and compare these results with its speciation, karyology, and breeding system.
Chloroplast genomes in subtribe Trionum were highly conserved except in Abelmoschus where four additional genes were duplicated. Recent diploid interspecific hybridization is suggested in Thepparatia sipsongpannaensis between T. fragrans and T. scandens during the Pleistocene, around 640 000 years ago. Our observations also indicate Thepparatia have a trioecious breeding system that combined with a unique habit, and a highly localized distribution pattern, have created cross-pollination barriers and ecological specialization. This suggests hybridization events are rare but evolutionary significant in subtribe Trionum.
Finally, our study supports important nomenclature changes: the synonymization of Hibiscus austroyunnanensis with Thepparatia fragrans and the publication of a new species, Thepparatia sipsongpannaensis.
allopolyploidy, Hibiscus, hybridization, liana, trioecy
© The Author(s) 2024. Published by Oxford University Press on behalf of The Linnean Society of London. 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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