Читать книгу Principles of Plant Genetics and Breeding - George Acquaah - Страница 355

This mechanism produces an outcome that is essentially equivalent to haploidy. The reduced (n) egg nucleus in a sexual embryo sac develops into a haploid embryo without fertilization by the sperm nucleus. In this case the embryo has not an identical genotype as the plant on which it is formed.

Other less common mechanisms of apomixis are androgenesis (development of a seed embryo from the sperm nucleus upon entering the embryo sac), and semigamy (sperm nucleus and egg nucleus develop independently without uniting, leading to one haploid embryo). The resulting haploid plants contain sectors of material from both maternal and paternal origin, and is therefore chimeric.