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Repeated Range Expansion and Glacial Endurance of Potentilla glabra (Rosaceae) in the Qinghai-Tibetan Plateau

Authors

  • Liu-Yang Wang,

    1. Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, the Chinese Academy of Sciences, Xining 810001, China
    2. Institute of Molecular Ecology, MOE Key Laboratory of Arid and Grassland Ecology, School of Life Science, Lanzhou University, Lanzhou 730000, China
    3. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
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  • Hiroshi Ikeda,

    1. Department of Botany, the University Museum, the University of Tokyo, Tokyo 113-0033, Japan
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  • Teng-Liang Liu,

    1. Institute of Molecular Ecology, MOE Key Laboratory of Arid and Grassland Ecology, School of Life Science, Lanzhou University, Lanzhou 730000, China
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  • Yu-Jin Wang,

    1. Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, the Chinese Academy of Sciences, Xining 810001, China
    2. Institute of Molecular Ecology, MOE Key Laboratory of Arid and Grassland Ecology, School of Life Science, Lanzhou University, Lanzhou 730000, China
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  • Jian-Quan Liu

    Corresponding author
    1. Institute of Molecular Ecology, MOE Key Laboratory of Arid and Grassland Ecology, School of Life Science, Lanzhou University, Lanzhou 730000, China
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  • Supported by the Frontier Project of the Knowledge Innovation Program of Northwest Plateau Institute of Biology of the Chinese Academy of Sciences, National Natural Science Foundation of China (30725004), and the Program for New Century Excellent Talents, Ministry of Education of China (NCET-05-0886), and a Grant-in Aid for Scientific Research (A) from the Ministry of Education, Culture, Sports, Science and Technology, Government of Japan (18255004).

*Author for correspondence.
Tel: +86 931 891 4305;
Fax: +86 931 891 4288;
E-mail: <liujq@nwipb.ac.cn>; <ljqdxy@public.xn.qh.cn>.

Abstract

To date, little is still known about how alpine species occurring in the Qinghai-Tibetan Plateau (QTP) responded to past climatic oscillations. Here, by using variations of the chloroplast trnT-L, we examined the genetic distribution pattern of 101 individuals of Potentilla glabra, comprising both the interior QTP and the plateau edge. Phylogenetic and network analyses of 31 recovered haplotypes identified three tentative clades (A, B and C). Analysis of molecular variance (amova) revealed that most of the genetic variability was found within populations (0.693), while differentiations between populations were obviously distinct (Fst= 0.307). Two independent range expansions within clades A and B occurring at approximately 316 and 201 thousand years ago (kya) were recovered from the hierarchical mismatch analysis, and these two expansions were also confirmed by Fu's FS values and ‘g’ tests. However, distant distributions of clade C and private haplotypes from clades A and B suggest that they had survived the Last Glacial Maximum (LGM) and previous glaciers in situ since their origins. Our findings based on available limited samples support that multiple refugia of a few cold-enduring species had been maintained in the QTP platform during LGM and/or previous glacial stages.

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