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- W2002198055 abstract "The Asteraceae, one of the largest families of flowering plants, shows an extreme diversity of breeding systems with many species having a pronounced flexibility in breeding strategy—a factor thought to be crucial to the success of this family in colonizing most major biogeographical regions. Despite self-incompatibility (SI) being the most common mode of outcrossing in the Asteraceae, there have been few detailed studies of SI within this family. This paper discusses the SI system operating in Senecio squalidus (Oxford ragwort), an invasive alien species that has colonized most parts of the UK within the last 150 years. In S. squalidus, SI is sporophytic and controlled by a single multiallelic S locus. Preliminary findings suggest that UK populations contain few S alleles. Pseudo self-compatibility (PSC) has been found to operate in S. squalidus and leads to total or partial loss of S-specific discrimination as females, though pollen S function is unaffected. Exceptional compatible and semi-compatible crosses in normally incompatible groups suggest that a cryptic gametophytic element (the G gene) can influence the outcome of certain crosses. It is suggested that PSC, mediated by modifier loci unlinked to the S locus, together with the apparent activity of a G gene in determining SI, may have provided flexibility in the SI system of S. squalidus that was crucial to its success as a colonist. Basic aspects of the cell biology of the pollen-stigma interaction during compatible and incompatible pollinations in S. squalidus are discussed in the light of previous studies of species in the Asteraceae and Brassicaceae." @default.
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- W2002198055 date "2000-03-01" @default.
- W2002198055 modified "2023-10-18" @default.
- W2002198055 title "Self-incompatibility in Senecio squalidus L. (Asteraceae)" @default.
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- W2002198055 doi "https://doi.org/10.1006/anbo.1999.1058" @default.
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