Plastid phylogenomics provides new insights into the systematics,diversification,and biogeography of Cymbidium(Orchidaceae)

Hai-Yao Chen ¹Zhi-Rong Zhang ²Xin Yao ³Ji-Dong Ya ²Xiao-Hua Jin ⁴Lin Wang ³Lu Lu ⁵De-Zhu Li ²Jun-Bo Yang ²Wen-Bin Yu³

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作者信息

1. Center for Integrative Conservation & Yunnan Key Laboratory for the Conservation of Tropical Rainforests and Asian Elephants,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Mengla,Yunnan 666303,China;University of Chinese Academy of Sciences,Huairou District,Beijing 101408,China
2. Plant Germplasm and Genomics Center,Germplasm Bank of Wild Species,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming,Yunnan 650201,China
3. Center for Integrative Conservation & Yunnan Key Laboratory for the Conservation of Tropical Rainforests and Asian Elephants,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Mengla,Yunnan 666303,China;Southeast Asia Biodiversity Research Institute,Chinese Academy of Sciences,Yezin,Nay Pyi Taw 05282,Myanmar
4. State Key Laboratory of Plant Diversity and Specility Crops,Institute of Botany,Chinese Academy of Sciences,Haidian District,Beijing 100093,China
5. School of Pharmaceutical Sciences,Yunnan Key Laboratory of Pharmacology for Natural Products,and Yunnan College of Modern Biomedical Industry,Kunming Medical University,Kunming,Yunnan 650500,China
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Abstract

Cymbidium(Orchidaceae:Epidendroideae),with around 60 species,is widely-distributed across South-east Asia,providing a nice system for studying the processes that underlie patterns of biodiversity in the region.However,phylogenetic relationships of Cymbidium have not been well resolved,hampering in-vestigations of species diversification and the biogeographical history of this genus.In this study,we construct a plastome phylogeny of 56 Cymbidium species,with four well-resolved major clades,which provides a framework for biogeographical and diversification rate analyses.Molecular dating and biogeographical analyses show that Cymbidium likely originated in the region spanning northern Indo-Burma to the eastern Himalayas during the early Miocene(～21.10 Ma).It then rapidly diversified into four major clades in East Asia within approximately a million years during the middle Miocene.Cymbidium spp.migration to the adjacent regions(Borneo,Philippines,and Sulawesi)primarily occurred during the Pliocene-Pleistocene period.Our analyses indicate that the net diversification rate of Cymbidium has decreased since its origin,and is positively associated with changes in temperature and monsoon in-tensity.Favorable hydrothermal conditions brought by monsoon intensification in the early Miocene possibly contributed to the initial rapid diversification,after which the net diversification rate was reduced with the cooling climate after the middle Miocene.The transition from epiphytic to terrestrial habits may have enabled adaptation to cooler environments and colonization of northern niches,yet without a significant effect on diversification rates.This study provides new insights into how monsoon activity and temperature changes affected the diversification dynamics of plants in Southeast Asia.

Key words

Cymbidium/East Asia/Asian monsoons/Climate change/Biogeographical patterns

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基金项目

中国科学院战略规划重点项目(XDB31000000)

14th Five-Year Plan of the Xishuangbanna Tropical Botanical Garden,Chinese Academy of sciences(XTBG-1450101)

Science and Technology Basic Resources Investigation Program of China(2021FY100200)

Key Basic Research Program ofYunnan Province,China(202101BC070003)

Yunnan Revitalization Talent Support Program"Young Talent"and"Innovation Team"Projects()

Ecological and Environmental Conservation Program from the Department of Ecology and Environment of Yunnan Province()

出版年

2024

植物多样性(英文)

中国科学院昆明植物研究所，中国植物学会

植物多样性(英文)

CSTPCDCSCD

影响因子：0.617

ISSN：2096-2703

参考文献量2

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