1.不同亲本的早熟性遗传传递能力强弱不同。早熟亲本的作用较大,但也不应忽视晚熟亲本的作用。可以根据亲本抽穗期平均数估计后代抽穗期的大致范围。2.抗病遗传中存在着量的关系。作者提出可以用苗期反应作为衡量亲本抗病性传递能力指标的看法。3.回交、复合杂交的方法,可以克服某些亲本材料特殊不良性状。 1. Different parents of premature sexual transmission ability of different strength. The role of precocious parents larger, but should not ignore the role of late-maturing parents. The approximate range of heading date for offspring can be estimated from the average number of headings in the parent. There is a quantitative relationship between disease resistance. The authors suggest that seedling response may be used as a measure of the ability of parents to convey disease resistance. 3. backcross, hybrid cross method, you can overcome some of the parent material special bad traits.