Effects of inbred/outbred crosses on progeny sex ratio in Silene latifolia (Caryophyllaceae).

Détails

ID Serval
serval:BIB_43D3E52FEB65
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Effects of inbred/outbred crosses on progeny sex ratio in Silene latifolia (Caryophyllaceae).
Périodique
The New Phytologist
Auteur(s)
Teixeira S., Bernasconi G.
ISSN
1469-8137[electronic]
Statut éditorial
Publié
Date de publication
2008
Volume
178
Numéro
2
Pages
448-456
Langue
anglais
Résumé
Sex ratio polymorphism has been extensively studied in Silene latifolia, but it is neither known whether inbreeding (which is likely to occur under field conditions) affects it, nor which of the proposed mechanisms (Y degeneration, X-linked drive) is more important. Both mechanisms predict reduced pollen performance. In this study, females were crossed with pollen from related and unrelated males in single-donor and two-donor crosses, and the sex ratio of offspring (n = 866, 60 crosses), sons'in vitro pollen germination and sex ratios in parental families were scored. Flowers receiving only unrelated pollen produced a significant excess of sons. Sex ratios were not significantly correlated between generations. Sons'in vitro pollen germination was significantly negatively correlated with the 'sex-ratio phenotype' of maternal grandfathers, but not of fathers. This generation leap may be consistent with X-linked determinants because Y-linked determinants alone cannot explain it (grandfathers, fathers and sons share the same Y chromosome). Further work is required, but inbreeding and limited dispersal may lead to local accumulation of biasing factors, a process potentially countered by conditional shifts to produce more sons in pure outbred crosses.
Mots-clé
Crosses, Genetic, Germination, Pollen/genetics, Seeds/genetics, Sex Ratio, Silene/genetics, Silene/physiology
Pubmed
Web of science
Création de la notice
01/02/2008 23:13
Dernière modification de la notice
20/08/2019 13:47
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