Across two phylogeographic breaks:Quaternary evolutionary history of a mountain aspen(Populus rotundifolia)in the Hengduan Mountains

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外文摘要：Biogeographical barriers to gene flow are central to plant phylogeography.In East Asia,plant distribution is greatly influenced by two phylogeographic breaks,the Mekong-Salween Divide and Tanaka-Kaiyong Line,however,few studies have investigated how these barriers affect the genetic diversity of species that are distributed across both.Here we used 14 microsatellite loci and four chloroplast DNA fragments to examine genetic diversity and distribution patterns of 49 populations of Populus rotundifolia,a species that spans both the Mekong-Salween Divide and the Tanaka-Kaiyong Line in southwestern China.De-mographic and migration hypotheses were tested using coalescent-based approaches.Limited historical gene flow was observed between the western and eastern groups of P.rotundifolia,but substantial flow occurred across both the Mekong-Salween Divide and Tanaka-Kaiyong Line,manifesting in clear admixture and high genetic diversity in the central group.Wind-borne pollen and seeds may have facilitated the dispersal of P.rotundifolia following prevalent northwest winds in the spring.We also found that the Hengduan Mountains,where multiple genetic barriers were detected,acted on the whole as a barrier between the western and eastern groups of P.rotundifolia.Ecological niche modeling sug-gested that P.rotundifolia has undergone range expansion since the last glacial maximum,and de-mographic reconstruction indicated an earlier population expansion around 600 Ka.The phylogeographic pattern of P.rotundifolia reflects the interplay of biological traits,wind patterns,bar-riers,niche differentiation,and Quaternary climate history.This study emphasizes the need for multiple lines of evidence in understanding the Quaternary evolution of plants in topographically complex areas.

外文关键词：

Chloroplast DNAMicrosatellitePhylogeographic breakPopulus rotundifoliaQuaternary historyWind direction

作者：

Jieshi Tang、Xiaoyan Fan、Richard I.Milne、Heng Yang、Wenjing Tao、Xinran Zhang、Mengyun Guo、Jialiang Li、Kangshan Mao

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作者单位：

Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education,College of Life Sciences,State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,PR China

Biogas Institute of Ministry of Agriculture and Rural Affairs,Chengdu,China

Institute of Molecular Plant Sciences,University of Edinburgh,Edinburgh EH9 3JH,UK

School of Ecology and Environment,Tibet University,Lhasa 850000,PR China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Basic Research Program of ChinaSichuan University Fundamental Research Funds for the Central UniversitiesSichuan University Fundamental Research Funds for the Central UniversitiesInstitutional Research Funds

项目编号：

41571054316220152014CB954100SCU2021D006SCU2022D0032021SCUNL102

出版年：

2024

DOI：

10.1016/j.pld.2024.03.009

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(3)