Genome-wide scans reveal cryptic population structure in a dry-adapted eucalypt

  • Dorothy A. Steane
  • Brad M. Potts
  • Elizabeth McLean
  • Lesley Collins
  • Suzanne M. Prober
  • William D. Stock
  • René E. Vaillancourt
  • Margaret Byrne
Original Paper
Part of the following topical collections:
  1. Population structure

Abstract

Genome-wide DArTseq scans of 268 individuals of Eucalyptus salubris, distributed along an aridity gradient in southwestern Australia, revealed cryptic population structure that appears to signal hitherto unappreciated ecotypic differentiation and barriers to gene flow. Genome-wide scans were undertaken on 30 wild-sampled individuals from each of nine populations; 10 individuals per population were measured for habit and functional traits. DArTseq generated 16,122 high-quality markers, of which 56.3 % located to E. grandis chromosomes. Genetic affinities of the nine populations were only weakly correlated with geographic distances. Rather, populations appeared to form two distinct molecular lineages that maintained their distinctiveness in an area of geographic overlap. Twenty-four outlier markers signalled divergent selection and differentiation of the two putative lineages. Populations from the two lineages were phenotypically differentiated in leaf thickness, specific leaf area (SLA) and leaf nitrogen per unit mass (Nmass). The more northerly lineage (with thinner leaves) occurred in hotter, drier conditions with higher radiation. Populations of the more southerly lineage occurred on soils that were relatively low in phosphorus; the trees had thicker leaves, lower SLA and lower leaf Nmass, consistent with general responses to low nutrient levels. While historic isolation and drift may have contributed to the cryptic population structure observed, there is evidence of ecotypic adaptation, which may provide an exogenous barrier to gene flow. This study highlights the power of new molecular technologies to provide novel insights into the genetic architecture of wild populations.

Keywords

Ecotypic variation Soil phosphorus Eucalyptus Outlier analysis DArTseq Population genetics 

Supplementary material

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Dorothy A. Steane
    • 1
    • 2
  • Brad M. Potts
    • 1
  • Elizabeth McLean
    • 3
    • 5
  • Lesley Collins
    • 4
  • Suzanne M. Prober
    • 5
  • William D. Stock
    • 6
  • René E. Vaillancourt
    • 1
  • Margaret Byrne
    • 3
  1. 1.School of Biological Sciences and National Centre for Future Forest IndustriesUniversity of TasmaniaHobartAustralia
  2. 2.Faculty of Science, Health, Education and Engineering and Collaborative Research NetworkUniversity of the Sunshine CoastMaroochydoreAustralia
  3. 3.Science and Conservation Division, Department of Parks and WildlifeBentley Delivery CentreBentleyAustralia
  4. 4.Faculty of Health ScienceUniversal College of LearningPalmerston NorthNew Zealand
  5. 5.CSIRO Land and Water FlagshipWembleyAustralia
  6. 6.Centre for Ecosystem Management, School of Natural SciencesEdith Cowan UniversityMount LawleyAustralia

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