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, 358 (1434), 1047-50

The Population Genetics of Sporophytic Self-Incompatibility in Senecio Squalidus L. (Asteraceae): Avoidance of Mating Constraints Imposed by Low S-allele Number

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The Population Genetics of Sporophytic Self-Incompatibility in Senecio Squalidus L. (Asteraceae): Avoidance of Mating Constraints Imposed by Low S-allele Number

Adrian C Brennan et al. Philos Trans R Soc Lond B Biol Sci.

Abstract

Senecio squalidus L. (Asteraceae) has been the subject of several ecological and population genetic studies due to its well-documented history of introduction, establishment and spread throughout Britain in the past 300 years. Our recent studies have focused on identifying and quantifying factors associated with the sporophytic self-incompatibility (SSI) system of S. squalidus that may have contributed to its success as a colonist. These findings are of general biological interest because they provide important insights into the short-term evolutionary dynamics of a plant mating system. The number of S-alleles in populations and their dominance interactions were investigated in eight wild British populations using cross-diallel studies. The numbers of S-alleles in British S. squalidus populations are typically low (average of 5.3 S-alleles) and the entire British population is estimated to possess no more than 7-11 S-alleles. Such low numbers of S-alleles are most probably a consequence of population bottlenecks associated with introduction and colonization. Potential evolutionary impacts on SSI caused by a paucity of S-alleles, such as restricted mate availability, are discussed, and we suggest that increased dominance interactions between S-alleles may be an important short-term means of increasing mate availability when S-allele numbers are low.

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References

    1. Heredity (Edinb). 2000 Jul;85 ( Pt 1):10-9 - PubMed
    1. Heredity (Edinb). 2002 Dec;89(6):430-8 - PubMed
    1. Genetics. 1963 Aug;48:1029-32 - PubMed
    1. Int Rev Cytol. 1999;193:165-295 - PubMed
    1. Plant Cell. 2000 Mar;12(3):309-10; author reply 313-5 - PubMed

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