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Sexual antagonism in the pistil varies among populations of a hermaphroditic mixed-mating plant.

Author:
  • Evan Hersh
  • Josefin Madjidian
  • Stefan Andersson
  • Maria Strandh
  • W Scott Armbruster
  • Åsa Lankinen
Publishing year: 2015
Language: English
Pages: 1321-1334
Publication/Series: Journal of Evolutionary Biology
Volume: 28
Issue: 7
Document type: Journal article
Publisher: John Wiley & Sons

Abstract english

Sexual conflicts and their evolutionary outcomes may be influenced by population-specific features such as mating system and ecological context; however, very few studies have investigated the link between sexual conflict and mating system. The self-compatible, mixed-mating hermaphrodite Collinsia heterophylla (Plantaginaceae) is thought to exhibit a sexual conflict over timing of stigma receptivity. This conflict involves 1) delayed stigma receptivity, which intensifies pollen competition, and 2) early fertilization forced by pollen, which reduces seed set. We investigated the potential for the conflict to occur under field conditions and performed greenhouse crosses within eight populations to assess its consistency across populations. Flowers were visited, and produced seeds after pollination, at all developmental stages, suggesting that the conflict can be of significance under natural conditions. In the greenhouse, early pollination imposed costs in all populations. Overall, the timing of first seed set was most strongly affected by the maternal parent, denoting stronger female than male ability to influence onset of stigma receptivity. Crosses also revealed a negative relationship between donor- and recipient-related onset of receptivity within individuals, a novel result hinting at trade-offs in sex-allocation or a history of antagonistic selection. Neither timing of stigma receptivity, timing of first seed set, nor pollen competitive ability covaried with population outcrossing rate. In conclusion, these results indicate that sexually antagonistic selection may be present in varying degrees in different populations of C. heterophylla, but this variation does not appear to be directly related to mating system variation. This article is protected by copyright. All rights reserved.

Keywords

  • Ecology

Other

Published
  • ISSN: 1420-9101
Maria Strandh
E-mail: maria [dot] strandh [at] biol [dot] lu [dot] se

Researcher

MEMEG

+46 46 222 92 12

E-C211

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Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
Ecology building S-223 62 Lund Sweden