J Syst Evol ›› 2016, Vol. 54 ›› Issue (2): 136-151.doi: 10.1111/jse.12171

• Research Articles • Previous Articles     Next Articles

Genetic structure and post-glacial expansion of Cornus florida L. (Cornaceae): integrative evidence from phylogeography, population demographic history, and species distribution modeling

Ashley Call1, Yan-Xia Sun1,2, Yan Yu1,3, Peter B. Pearman4,5, David T. Thomas6, Robert N. Trigiano7, Ignazio Carbone8, and Qiu-Yun (Jenny) Xiang1*   

  1. 1Department of Plant and Microbial Biology, North Carolina State University, Raleigh, USA
    2Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, China
    3Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, China
    4Department of Plant Biology and Ecology, Faculty of Sciences and Technology, University of the Basque Country UPV/EHU, Leioa, Bizkaia, Spain
    5IKERBASQUE Basque Foundation for Science, Maria Diaz de Haro 3, Bilbao, Bizkaia, Spain
    6Arts, Sciences and Learning Resources, Johnston Community College, Smithfield, USA
    7Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, USA
    8Center for Integrated Fungal Research, Department of Plant Pathology, North Carolina State University, Raleigh, 27695-7244, USA
  • Received:2014-10-05 Online:2015-07-19 Published:2016-03-16

Abstract: Repeated global climatic cooling and warming cycles during the Pleistocene played a major role in the distribution and evolution of the Earth biota. Here, we integrate phylogeography, coalescent-based Bayesian estimation of demographic history, and species distribution modeling (SDM) to understand the genetic patterns and biogeography of the flowering dogwood, Cornus florida subsp. florida L., since the Last Glacial Maximum (LGM). Natural populations of the species are severely threatened by dogwood anthracnose. We genotyped 306 plants from 73 locations of the species across most of its native distribution with three DNA regions from the plastid genome, ndhF-rpl32, rps16 and trnQ-rps16. The genealogy and haplotype network reconstruction revealed two haplotype lineages diverging ≈3.70 million years ago. We detected no clear geographic structuring of genetic variation, although significant local structure appeared to be evident, likely due to a combination of substantial localized seed dispersal by small mammals and small population size/limited sampling at a location. The spatial distribution of haplotype frequencies, estimated population demographic history, and results from hindcasting analysis using SDM suggested refugia in southeastern North America and population reduction during the LGM, followed by rapid post-glacial expansion to the north. Forecasting analysis using SDM predicted range shifts to the north under ongoing global warming. Our results further suggested that gene flow via seed dispersal has been high but insufficient to counter the effect of genetic drift. This study demonstrates the benefit of integrating genetic data and species distribution modeling to obtain corroborative evidence in elucidating recent biogeographic history and understanding of genetic patterns and species evolution.

Key words: Bayesian skyride plot, Cornus florida, LGM, phylogeography, plastid DNA, post-glacial range expansion, species distribution modeling

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