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

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

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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.

CymbidiumEast AsiaAsian monsoonsClimate changeBiogeographical patterns

Hai-Yao Chen、Zhi-Rong Zhang、Xin Yao、Ji-Dong Ya、Xiao-Hua Jin、Lin Wang、Lu Lu、De-Zhu Li、Jun-Bo Yang、Wen-Bin Yu

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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

Plant Germplasm and Genomics Center,Germplasm Bank of Wild Species,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming,Yunnan 650201,China

Southeast Asia Biodiversity Research Institute,Chinese Academy of Sciences,Yezin,Nay Pyi Taw 05282,Myanmar

State Key Laboratory of Plant Diversity and Specility Crops,Institute of Botany,Chinese Academy of Sciences,Haidian District,Beijing 100093,China

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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中国科学院战略规划重点项目14th Five-Year Plan of the Xishuangbanna Tropical Botanical Garden,Chinese Academy of sciencesScience and Technology Basic Resources Investigation Program of ChinaKey Basic Research Program ofYunnan Province,ChinaYunnan Revitalization Talent Support Program"Young Talent"and"Innovation Team"ProjectsEcological and Environmental Conservation Program from the Department of Ecology and Environment of Yunnan Province

XDB31000000XTBG-14501012021FY100200202101BC070003

2024

10.1016/j.pld.2024.03.001

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)

CSTPCD
影响因子：0.617
ISSN：2096-2703
年,卷(期)：2024.46(4)
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