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The Effect of Polyploidy and Mating System on Floral Size and the Pollination Niche in Brassicaceae

N. S. Streher,Trezalka Budinsky,Keren Halabi,I. Mayrose,T. Ashman

Published 2023 in INTERNATIONAL JOURNAL PLANT SCIENCES

ABSTRACT

Premise of research. Polyploidy, a major evolutionary process in flowering plants, is expected to impact floral traits, which can have cascading effects on pollination interactions, but this may depend on selfing propensity. In a novel use of herbarium specimens, we assessed the effects of polyploidy and mating system on floral traits and the pollination niche of 40 Brassicaceae species. Methodology. We combined data on mating system (self-compatible or self-incompatible) with inferred ploidy level (polyploid or diploid) and used phylogenetically controlled analyses to investigate their influence on floral traits (size and shape) and the degree of pollination generalism based on the frequency and the richness of heterospecific pollen morphospecies captured by stigmas. Pivotal results. Flower size (but not shape) depended on the interaction between ploidy and mating system. Self-incompatible polyploid species had larger flowers than self-incompatible diploids, but there was no difference for self-compatible species. The breadth of pollination niche (degree of generalism) was not affected by ploidy but was rather strongly affected by mating system only. Self-incompatible species had more stigmas with heterospecific pollen and higher heterospecific pollen morphospecies richness per stigma than self-compatible species, regardless of their ploidy. Conclusions. Our results demonstrate that mating system moderated the influence of ploidy on morphological features associated with pollination generalism but that response in terms of heterospecific pollen captured as a proxy of pollination generalism was more variable.

PUBLICATION RECORD

  • Publication year

    2023

  • Venue

    INTERNATIONAL JOURNAL PLANT SCIENCES

  • Publication date

    2023-09-26

  • Fields of study

    Not labeled

  • Identifiers
    DOI 10.1086/727826
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

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