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Competitive ability of a tetraploid selfing species (Capsella bursa-pastoris) across its expansion range and comparison with its sister species

Xuyue Yang,M. Lascoux,S. Glémin

Published 2017 in bioRxiv

ABSTRACT

Self-fertilization is often associated with ecological traits corresponding to the ruderal strategy in Grime’s CSR classification. Consequently, selfers are expected to be less competitive than outcrossers, either because of a colonization/competition trade-off or because of the deleterious genetic effects of selfing. Range expansion could reduce further competitive ability while polyploidy could mitigate the effects of selfing. Although suggested by meta-analyses, these predictions have not been directly tested yet. We compared the competitive ability of four Capsella species differing by their mating system and ploidy level. We found that the two diploid selfing species (C. rubella and C. orientalis) were more sensitive to competition than the diploid outcrosser (C. grandiflora), and the tetraploid selfer (C. bursa-pastoris) was intermediate. Within C. bursa-pastoris, we also found that sensitivity to competition increased across range expansion. These results highlight the possible roles of ecological context and ploidy in the evolutionary trajectories of selfing species.

PUBLICATION RECORD

  • Publication year

    2017

  • Venue

    bioRxiv

  • Publication date

    2017-11-06

  • Fields of study

    Biology, Environmental Science

  • Identifiers
    DOI 10.1101/214866
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

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