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Ecol Evol. 2016 Jun 26;6(14):5076-86. doi: 10.1002/ece3.2268. eCollection 2016 Jul.

Corolla chirality does not contribute to directed pollen movement in Hypericum perforatum (Hypericaceae): mirror image pinwheel flowers function as radially symmetric flowers in pollination.

Ecology and evolution

Carolina Diller, Charles B Fenster

Affiliations

  1. Department of Biology University of Maryland College Park Maryland 20742.
  2. Department of Biology and Microbiology South Dakota State University Brookings South Dakota 57007.

PMID: 27547334 PMCID: PMC4979728 DOI: 10.1002/ece3.2268

Abstract

Corolla chirality, the pinwheel arrangement of petals within a flower, is found throughout the core eudicots. In 15 families, different chiral type flowers (i.e., right or left rotated corolla) exist on the same plant, and this condition is referred to as unfixed/enantiomorphic corolla chirality. There are no investigations on the significance of unfixed floral chirality on directed pollen movement even though analogous mirror image floral designs, for example, enantiostyly, has evolved in response to selection to direct pollinator and pollen movement. Here, we examine the role of corolla chirality on directing pollen transfer, pollinator behavior, and its potential influence on disassortative mating. We quantified pollen transfer and pollinator behavior and movement for both right and left rotated flowers in two populations of Hypericum perforatum. In addition, we quantified the number of right and left rotated flowers at the individual level. Pollinators were indifferent to corolla chirality resulting in no difference in pollen deposition between right and left flowers. Corolla chirality had no effect on pollinator and pollen movement between and within chiral morphs. Unlike other mirror image floral designs, corolla chirality appears to play no role in promoting disassortative mating in this species.

Keywords: Disassortative mating; enantiomorphic contort aestivation; floral symmetry; mirror image; pollination; rotational symmetry

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