A breeding programme designed to establish the number of loci controlling the sporophytic self-incompatibility system in Sinapis arvensis has been completed. The programme involved analyses of diallel crosses within F1 and F2 families derived from crosses between plants from geographically remote populations, and within self families derived from the parental plants. Incompatibility reactions were determined cytologically using fluorescence microscopy. Control by a single locus has been established. However, the expression of individual S-alleles may be modified, as shown by incomplete dominance in a self family, and mutual weakening in an F1 family.
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Stevens, J., Kay, Q. The number of loci controlling the sporophytic self-incompatibility system in Sinapis arvensis L.. Heredity 61, 411–418 (1988). https://doi.org/10.1038/hdy.1988.132
New Phytologist (2014)
The number, dominance relationships and frequencies of self-incompatibility alleles in a natural population of Sinapis arvensis L. in South Wales