Читать книгу Principles of Plant Genetics and Breeding - George Acquaah - Страница 224

Self‐incompatibility (or lack of self‐fruitfulness) is a condition in which the pollen from a flower is not receptive on the stigma of the same flower and hence incapable of setting seed. This happens in spite of the fact that both pollen and ovule development are normal and viable. It is caused by a genetically controlled physiological hindrance to self‐fertilization. Self‐incompatibility is widespread in nature, occurring in families such as Poaceae, Cruciferae, Compositae, and Rosaceae. The incompatibility reaction is genetically conditioned by a locus designated S, with multiple alleles that can number over 100 in some species such as Trifolium pretense. However, unlike monoecy and dioecy, all plants produce seed in self‐incompatible species.