Regeneration of plants by culture of sexual male cells, isolated pollen or anthers, no mature. The obtained individuals, haploids, express directly their genome after doubling of their stock of chromosomes spontaneously or induced by colchicine. The obtained plants are perfectly homozygous, they are pure lines.

male parthenogenesis in which the embryo contains only paternal chromosomes due to the failure of the egg nucleus to participate in fertilization