The opposing effects of genetic drift and Haldane's sieve on floral-morph frequencies in tristylous metapopulations.

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Etat: Public
Version: de l'auteur
Licence: CC BY-NC-ND 4.0
ID Serval
serval:BIB_CFFE70C1A96D
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
The opposing effects of genetic drift and Haldane's sieve on floral-morph frequencies in tristylous metapopulations.
Périodique
The New phytologist
Auteur(s)
Roux C., Pannell J.R.
ISSN
1469-8137 (Electronic)
ISSN-L
0028-646X
Statut éditorial
Publié
Date de publication
11/2019
Peer-reviewed
Oui
Volume
224
Numéro
3
Pages
1229-1240
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
Tristyly is a genetic floral polymorphism in which three floral morphs are maintained at equal frequencies by negative frequency-dependent selection on alleles at two interacting loci. Because dominant alleles at these loci are maintained at a lower frequency than their recessive counterparts, they are more likely to be lost by founder events and genetic drift. Here we examine the hypothesis that dominant alleles under negative frequency-dependent selection should also be more likely to re-invade populations than recessive alleles, due to Haldane's Sieve, because recessive alleles not expressed in a heterozygote state cannot benefit from positive selection when rare. We used computer simulations of tristylous metapopulations to verify that Haldane's Sieve acting on migrants into occupied demes can indeed reverse the bias in allele frequencies expected for small single tristylous populations, particularly in situations of rapid population growth following colonisation. This effect is manifest both locally and at the metapopulation level. Our study illustrates the potential effect of Haldane's Sieve in the novel context of an iconic plant sexual-system polymorphism under the influence of metapopulation dynamics.
Mots-clé
Alleles, Flowers/anatomy & histology, Flowers/genetics, Genes, Dominant, Genetic Drift, Genetics, Population, Genotype, Polymorphism, Genetic, Time Factors, Eichhornia paniculata, disassortative mating, dominance drive, frequency-dependent selection, tristyly
Pubmed
Web of science
Open Access
Oui
Création de la notice
13/09/2019 11:45
Dernière modification de la notice
29/09/2020 6:26
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