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

Details

Ressource 1Request a copy Sous embargo indéterminé.
State: Public
Version: author
License: CC BY-NC-ND 4.0
Serval ID
serval:BIB_CFFE70C1A96D
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
The opposing effects of genetic drift and Haldane's sieve on floral-morph frequencies in tristylous metapopulations.
Journal
The New phytologist
Author(s)
Roux C., Pannell J.R.
ISSN
1469-8137 (Electronic)
ISSN-L
0028-646X
Publication state
Published
Issued date
11/2019
Peer-reviewed
Oui
Volume
224
Number
3
Pages
1229-1240
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Abstract
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.
Keywords
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
Yes
Create date
13/09/2019 10:45
Last modification date
29/09/2020 5:26
Usage data