Drift in small populations predicts mate availability and the breakdown of self-incompatibility in a clonal polyploid

© 2024 The Author(s). New Phytologist © 2024 New Phytologist Foundation.

Détails bibliographiques
Publié dans:The New phytologist. - 1979. - (2024) vom: 23. Dez.
Auteur principal: Cisternas-Fuentes, Anita (Auteur)
Autres auteurs: Forehand, Cameron, Morris, Kate, Busch, Jeremiah W, Koski, Matthew H
Format: Article en ligne
Langue:English
Publié: 2024
Accès à la collection:The New phytologist
Sujets:Journal Article Argentina anserina S‐locus leaky SI mate limitation mating system polyploidy self‐incompatibility
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520 |a Mate limitation in small populations can reduce reproductive fitness, hinder population growth, and increase extinction risk. Mate limitation is exacerbated in self-incompatible (SI) taxa, where shared S-alleles further restrict mating. Theory suggests genetic drift as a predictor of mate limitation and the breakdown of SI systems. We tested this prediction by evaluating mate availability and S-allele number in populations of a tetraploid herb with gametophytic SI (GSI) spanning a range of effective population sizes. We performed controlled crosses in 13 populations of Argentina anserina to quantify mate availability and S-allele diversity, which were compared with simulations of tetraploid populations with GSI. We further evaluated mechanisms at the pollen-pistil interface contributing to outcross failure and leakiness in self-recognition. Mate availability declined in small populations, and closely fit tetraploid GSI population genetic models where maternal plants receive pollen with diverse S-alleles generated through tetrasomic inheritance. The failure to arrest self-pollen in the style was common in some populations. Specifically, leaky SI was more common in small populations with low mate availability, where it explained higher seed production in natural populations. The restriction of leaky self-recognition to the smallest populations is consistent with mate limitation as a pressure driving the breakdown of self-incompatibility 
650 4 |a Journal Article 
650 4 |a Argentina anserina 
650 4 |a S‐locus 
650 4 |a leaky SI 
650 4 |a mate limitation 
650 4 |a mating system 
650 4 |a polyploidy 
650 4 |a self‐incompatibility 
700 1 |a Forehand, Cameron  |e verfasserin  |4 aut 
700 1 |a Morris, Kate  |e verfasserin  |4 aut 
700 1 |a Busch, Jeremiah W  |e verfasserin  |4 aut 
700 1 |a Koski, Matthew H  |e verfasserin  |4 aut 
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