Pleistocene glaciation advances the cryptic speciation of Stellera chamaejasme L.in a major biodiversity hotspot

Santosh Kumar Rana ¹Hum Kala Rana ²Jacob B.Landis ³Tianhui Kuang ²Juntong Chen ²Hengchang Wang ⁴Tao Deng ²Charles C.Davis ⁵Hang Sun²

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作者信息

1. CAS Key Laboratory for Plant Diversity and Biogeography of East Asia,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China;Arkansas Biosciences Institute,Arkansas State University,Jonesboro,Arkansas 72401,USA
2. CAS Key Laboratory for Plant Diversity and Biogeography of East Asia,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China
3. School of Integrative Plant Science,Section of Plant Biology and the L.H.Bailey Hortorium,Cornell University,Ithaca,New York 14853,USA;BTI Computational Biology Center,Boyce Thompson Institute,Ithaca,New York 14853,USA
4. CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture,Chinese Academy of Sciences,Wuhan Botanical Garden,Wuhan 430074,China
5. Department of Organismic and Evolutionary Biology,Herbaria,Harvard University,Cambridge,Massachusetts 02138,USA
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Abstract

The mountains of Southwest China comprise a sig-nificant large mountain range and biodiversity hot-spot imperiled by global climate change.The high species diversity in this mountain system has long been attributed to a complex set of factors,and re-cent large-scale macroevolutionary investigations have placed a broad timeline on plant diversification that stretches from 10 million years ago(Mya)to the present.Despite our increasing understanding of the temporal mode of speciation,finer-scale population-level investigations are lacking to better refine these temporal trends and illuminate the abiotic and biotic influences of cryptic speciation.This is largely due to the dearth of organismal sampling among closely related species and populations,spanning the in-credible size and topological heterogeneity of this region.Our study dives into these evolutionary dy-namics of speciation using genomic and eco-morphological data of Stellera chamaejasme L.We identified four previously unrecognized cryptic spe-cies having indistinct morphological traits and large metapopulation of evolving lineages,suggesting a more recent diversification(～2.67-0.90 Mya),largely influenced by Pleistocene glaciation and biotic fac-tors.These factors likely influenced allopatric spe-ciation and advocated cyclical warming-cooling episodes along elevational gradients during the Pleistocene.The study refines the evolutionary timeline to be much younger than previously im-plicated and raises the concern that projected future warming may influence the alpine species diversity,necessitating increased conservation efforts.

Key words

cryptic speciation/glacial-interglacial/Hengduan Mountains/north-south migration/Stellera chamaejasme

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基金项目

Second Tibetan Plateau Scientific Expedition and Research(STEP)program(2019QZKK0502)

Key Projects of the Joint Fund of the National Natural Science Foundation of China(U23A20149)

Research Fund for International Young Scientists of the National Natural Science Foundation of China(32150410356)

National Natural Science Foundation of China(32322006)

Young Academic and Technical Leader Raising Foundation of Yunnan Province(2019HB039)

International Association for Plant Taxonomy(IAPT)Research grant(421064806)

the"CAS President's International Fellowship Initiative"(PIFI)postdoctoral fellowship(2021PB0034)

出版年

2024

植物学报(英文版)

中国植物学会

植物学报(英文版)

CSTPCD

影响因子：0.921

ISSN：1672-9072

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