首页|Genetically-and environmentally-dependent processes drive interspecific and intraspecific divergence in the Chinese relict endemic genus Dipteronia

Genetically-and environmentally-dependent processes drive interspecific and intraspecific divergence in the Chinese relict endemic genus Dipteronia

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China is a hotspot of relict plant species that were once widespread throughout the Northern Hemi-sphere.Recent research has demonstrated that the occurrence of long-term stable refugia in the mountainous regions of central and south-western China allowed their persistence through the late Neogene climate fluctuations.One of these relict lineages is Dipteronia,an oligotypic tree genus with a fossil record extending to the Paleocene.Here,we investigated the genetic variability,demographic dynamics and diversification patterns of the two currently recognized Dipteronia species(Dipteronia sinensis and D.dyeriana).Molecular data were obtained from 45 populations of Dipteronia by genotyping three cpDNA regions,two single copy nuclear genes and 15 simple sequence repeat loci.The genetic study was combined with niche comparison analyses on the environmental space,ecological niche modeling,and landscape connectivity analysis.We found that the two Dipteronia species have highly diverged both in genetic and ecological terms.Despite the incipient speciation processes that can be observed in D.sinensis,the occurrence of long-term stable refugia and,particularly,a dispersal corridor along Daba Shan-west Qinling,likely ensured its genetic and ecological integrity to date.Our study will not only help us to understand how populations of Dipteronia species responded to the tectonic and climatic changes of the Cenozoic,but also provide insight into how Arcto-Tertiary relict plants in East Asia survived,evolved,and diversified.

DipteroniaInterspecific/intraspecific divergenceGenetic structureClimatic niche divergenceDispersal corridor

Tao Zhou、Xiaodan Chen、Jordi López-Pujol、Guoqing Bai、Sonia Herrando-Moraira、Neus Nualart、Xiao Zhang、Yuemei Zhao、Guifang Zhao

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Key Laboratory of Resource Biology and Biotechnology in Western China(Ministry of Education),College of Life Sciences,Northwest University,Xi'an 710069,China

School of Pharmacy,Xi'an Jiaotong University,Xi'an 710061,China

College of Life Science,Shanxi Normal University,Taiyuan,China

Botanic Institute of Barcelona(IBB),CSIC-CMCNB,Barcelona 08038,Catalonia,Spain

Escuela de Ciencias Ambientales,Universidad Espíritu Santo(UEES),Samborondón 091650,Ecuador

Shaanxi Engineering Research Centre for Conservation and Utilization of Botanical Resources,Xi'an Botanical Garden of Shaanxi Province,Xi'an 710061,China

School of Biological Sciences,Guizhou Education University,Guiyang,China

Key Laboratory of Resource Biology and Biotechnology in Western China,Ministry of Education,College of Life Sciences,Northwest University,Xi'an 710069,China

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2024

10.1016/j.pld.2024.04.008

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(5)