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Patterns of genetic divergence among populations of the pseudometallophyte Biscutella laevigata from southern Poland

Babst-Kostecka, Alicja ; Parisod, Christian ; Godé, Cécile ; Vollenweider, Pierre ; Pauwels, Maxime

In: Plant and Soil, 2014, vol. 383, no. 1-2, p. 245-256

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    Titre
    • Patterns of genetic divergence among populations of the pseudometallophyte Biscutella laevigata from southern Poland
    Auteur
    • Babst-Kostecka, Alicja. Institute of Botany Polish Academy of Sciences, Lubicz 46, 31512, Krakow, Poland
    • Parisod, Christian. Laboratory of Evolutionary Botany, Institute of Biology, University of Neuchâtel, 2000, Neuchâtel, Switzerland
    • Godé, Cécile. Laboratoire de Génétique et Evolution des Populations Végétales, FRE CNRS 3268, Université de Lille-Lille1, 59655, Villeneuve d'Ascq, France
    • Vollenweider, Pierre. Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zürcherstrasse 111, 8903, Birmensdorf, Switzerland
    • Pauwels, Maxime. Laboratoire de Génétique et Evolution des Populations Végétales, FRE CNRS 3268, Université de Lille-Lille1, 59655, Villeneuve d'Ascq, France
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Plant and Soil, 2014, vol. 383, no. 1-2, p. 245-256. Springer International Publishing
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:325942
    Summary
    Background and aims: Pseudometallophytes are model organisms for adaptation and population differentiation because they persist in contrasting edaphic conditions of metalliferous and non-metalliferous habitats. We examine patterns of genetic divergence and local adaptation of Biscutella laevigata to assess historical and evolutionary processes shaping its genetic structure. Methods: We sampled all known populations of B. laevigata in Poland and analyzed respective soil metal concentrations. For genotyping we used nine nuclear microsatellite loci. Population genetic pools were identified (Bayesian clustering) and we estimated genetic parameters and demographic divergence between metallicolous and non-metallicolous populations (ABC-approach). Results: Populations clustered into two groups which corresponded to their edaphic origin and diverged 1,200 generations ago. We detected a significant decrease in genetic diversity and evidence for a recent bottleneck in metallicolous populations. Genetic structure was unrelated to site distribution but is rather influenced by environmental conditions (i.e. soil metal concentration). Conclusions: The intriguing disjunctive distribution of B. laevigata in Poland results from a fragmentation of the species range during the Holocene, rather than recent long-distance-dispersal events. The genetic structure of populations, however, continues to be modified by microevolutionary processes at anthropogenic sites. These clear divergence patterns promote B. laevigata as a model species for plant adaptation to polluted environments.