制种要求排除由母本产生的花粉。母本去雄不彻底有发生自花授粉的可能。自交种子的混杂降低了一批杂交种子的质量,大田出现生长势弱和可能空秆株,从而导致减产,失去育种家提供的遗传增益。一种检验每批杂交种子纯度的方法是,在田间种植样品,确定母本自交株的频率。传统采用的大田生长试验,是根据自交株的营养生 Seed production requires the exclusion of pollen produced by the female parent. Male parent to male is not completely self-pollination may occur. Hybrids of selfed seeds reduced the quality of a number of hybrid seeds, with weak and possibly empty stems in the field, resulting in reduced production and loss of the genetic gain provided by breeders. One way to test the purity of each batch of hybrid seeds is to plant the samples in the field and determine the frequency of the female parent inbreds. The traditionally used field growth test is based on vegetative health of selfing plants