Abstract
The interactions of nine S-gene lines of Brassica napus were examined. Seven different S-genes were involved in the crosses, with three lines of different origin having the same S-gene. In general, the reactions on selfing the heterozygotes were as expected from the results of test crosses with the homozygous parent lines. All types of dominance relationships were found, including reversal of dominance in pollen and pistil. Weakening of activity of one or both genes was found in several cases. Background genotype was found have to some effect and reciprocal differences in reactions were also observed.
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