Sporophytic incompatibility with 2 and 3 genes

Abstract

By using incompatibility parameters and not exact fit, a satisfactory fit of all the Eruca families to a 3 gene sporophytic system is obtained, but a 4 gene system is not excluded. Any system with gametophytic control is decisively excluded. The proportions of dominance and co-dominance in the best fit theoretical families is 2/5 dominant and 3/5 co-dominant pairs. The co-dominance among allelic pairs is distributed evenly between pollen and style. The establishment of a 3 gene sporophytic system opens up new possibilities for the genetical and biochemical control of incompatibility in plants.