出穗期属于数量性状。子一代多介于两亲之間而偏早,子二代呈連續性变异,多为双亲的中間型。由于超亲現象的存在,后代可能出現少熟此双亲早熟或晚熟的組合或个体。子二代变幅相当大,因此不能仅根据子一代的熟期来淘汰組合。在育种上选擇亲本时,应尽量使二亲本的平均出穗期与选育的目标相近。正交与反交对后代熟期几乎无影响,配制組合时可以不必考虑。 The heading date belongs to quantitative traits. Sub-generation more than between the two parents and early, the second generation was a continuous mutation, mostly for the parents of the middle. Due to the existence of super-progeny, offspring may appear less mature or early maturing parents or late combinations or individuals. Sub-two large amplitude changes, it is not only based on the maturity of the child to phase out the portfolio. When choosing parents in breeding, we should try our best to make the average heading date of the two parents close to the goal of breeding. Orthogonal and anti-generation of offspring almost no effect on the maturity, the preparation of combinations may not have to consider.