Low siring success of females with an acquired male function illustrates the legacy of sexual dimorphism in constraining the breakdown of dioecy.

Détails

Ressource 1Télécharger: Blanco_et_al-2019-Ecology_Letters.pdf (499.61 [Ko])
Etat: Public
Version: Final published version
ID Serval
serval:BIB_0B092ED3A95E
Type
Article: article d'un périodique ou d'un magazine.
Sous-type
Lettre (letter): communication adressée à l'éditeur.
Collection
Publications
Institution
Titre
Low siring success of females with an acquired male function illustrates the legacy of sexual dimorphism in constraining the breakdown of dioecy.
Périodique
Ecology letters
Auteur⸱e⸱s
Santos Del Blanco L., Tudor E., Pannell J.R.
ISSN
1461-0248 (Electronic)
ISSN-L
1461-023X
Statut éditorial
Publié
Date de publication
03/2019
Peer-reviewed
Oui
Volume
22
Numéro
3
Pages
486-497
Langue
anglais
Notes
Publication types: Letter
Publication Status: ppublish
Résumé
Dioecy has often broken down in flowering plants, yielding functional hermaphroditism. We reasoned that evolutionary transitions from dioecy to functional hermaphroditism must overcome an inertia of sexual dimorphism, because modified males or females will express the opposite sexual function for which their phenotypes have been optimised. We tested this prediction by assessing the siring success of monoecious individuals of the plant Mercurialis annua with an acquired male function but that are phenotypically still female-like. We found that pollen dispersed by female-like monoecious individuals was ~ 1/3 poorer at siring outcrossed offspring than pollen from monoecious individuals with an alternative male-like inflorescence. We conclude that whereas dioecy might evolve from functional hermaphroditism by conferring upon individuals certain benefits of sexual specialisation, reversion from a strategy of separate sexes to one of combined sexes must overcome constraints imposed by the advantages of sexual dimorphism. The breakdown of dioecy must therefore often be limited to situations in which outcrossing cannot be maintained and where selection favours a capacity for inbreeding by functional hermaphrodites.
Mots-clé
Biological Evolution, Female, Humans, Magnoliopsida, Male, Plant Breeding, Pollen, Reproduction, Sex Characteristics, Mercurialis annua, Dioecy, functional hermaphroditism, gain curves, inflorescence architecture, monoecy, sex allocation, sexual dimorphism
Pubmed
Web of science
Open Access
Oui
Création de la notice
03/02/2019 15:18
Dernière modification de la notice
21/11/2022 8:18
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