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Enhanced leaky sex expression in response to pollen limitation in the dioecious plant Mercurialis annua.

Authors
  • Cossard, Guillaume G1
  • Pannell, John R1
  • 1 Department of Ecology and Evolution, Biophore Building, University of Lausanne, Lausanne, Switzerland. , (Switzerland)
Type
Published Article
Journal
Journal of Evolutionary Biology
Publisher
Wiley (Blackwell Publishing)
Publication Date
Feb 01, 2021
Volume
34
Issue
2
Pages
416–422
Identifiers
DOI: 10.1111/jeb.13720
PMID: 33098734
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

In dioecious plants, males and females frequently show 'leaky' sex expression, with individuals occasionally producing flowers of the opposite sex. This leaky sex expression may have enabled the colonization of oceanic islands by dioecious plant species, and it is likely to represent the sort of variation upon which selection acts to bring about evolutionary transitions from dioecy to hermaphroditism. Although leakiness is commonly reported for dioecious species, it is not known whether it has plastic component. The question is interesting because males or females with an ability to enhance their leakiness plastically in the absence of mates would have an advantage of being able to produce progeny by self-fertilization. Here, we demonstrate that leaky sex expression in the wind-pollinated dioecious herb Mercurialis annua is plastically responsive to its mating context. We compared experimental populations of females growing either with or without males. Females growing in the absence of males were leakier in their sex expression than controls growing with males, producing more than twice as many male flowers. Our results thus provide a striking instance of plasticity in the reproductive behaviour of plants that is likely adaptive. We consider how females might sense their mating environment as a function of pollen availability, and we discuss possible constraints on the evolution of plasticity in sex expression when the environmental signals that individuals receive are unreliable. © 2020 The Authors. Journal of Evolutionary Biology published by John Wiley & Sons Ltd on behalf of European Society for Evolutionary Biology.

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