Summary
A survey of outcrossing rates at the ray floret locus in an Edinburgh population of Senecio vulgaris in 1979 and 1980 showed that in both years radiate plants outcrossed at much greater frequencies than non-radiate plants. This confirmed a difference previously found between the two morphs in two Edinburgh populations investigated in 1978 (Marshall and Abbott, 1982). The size of the difference at peak flowering periods varied greatly between years, reaching 35 per cent in June 1979 then falling to 7 per cent in May 1980. An extension of the survey to include large populations polymorphic at the ray floret locus, from Leeds, Cardiff and Rhosllanerchrugog (Clwyd) revealed a similar pattern of genotypic differences in outcrossing. It is concluded that the difference is a general feature of the ray floret polymer phism in S. vulgaris.
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Marshall, D., Abbott, R. Polymorphism for outcrossing frequency at the ray floret locus in Senecio vulgaris L. II. Confirmation. Heredity 52, 331–336 (1984). https://doi.org/10.1038/hdy.1984.40
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DOI: https://doi.org/10.1038/hdy.1984.40
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