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采用生育期不同的籼型野败恢复系和保持系与典型粳稻和籼粳中间型亲本配制成８０份籼粳杂种一代组合，用亚种肉品种间杂交为对照，研究了籼粳稻杂种一代生育期的表现。结果表明，以籼粳亚种间杂种一代生育期优势最强，一般都超过双亲平均值；品种间杂种一代生育期优势最弱，接近中亲值；籼或使型亲本配籼粳中间型亲本，杂种一代生育期优势介于上述两类型组合之间。籼粳杂交由于双亲的不同，组合间Ｆ１生育期优势差异很大，有的组合甚至出现负向优势．这种生育期优势差异既受双亲本身生育期的迟早所支配，如杂种一代生育期长短排列顺序为中籼／晚粳＞中籼／早或中粳＞早籼或早熟中籼／晚粳＞早籼或早熟中籼／早或中粳；又受籼型亲本所含的野败恢、保遗传基因所制约，凡用籼型野败恢复系配制的籼粳杂种一代其生育期优势明显减弱，并与双亲籼、粳遗传距离的大小有关，杂种一代生育期优势随双亲籼、便遗传距离的扩大而增强。
A total of 80 combinations of indica and japonica hybrids were prepared by indica wild-type restorer lines and maintainer lines with different growth stages and typical intermediate japonica and indica-japonica parents. The cross between subspecies of meat was used as a control to study the hybrid generation of indica and japonica hybrids The performance of the period. The results showed that the indica or japonica intergeneric hybrids had the strongest advantage in the growth period and generally exceeded the average value of the parents. The hybrid generation had the weakest advantage in the growth period and close to the mid-parent value. , Hybrid generation growth period between the above two types of combinations. Indica-japonica cross Because of the differences in parents, there are great differences in the advantages of F1 between the combinations, and some combinations even have negative advantages. The difference of growth advantage during this period was controlled by the parents’ own growth period. For example, the growth stages of hybrids were indica / late japonica> indica / early or middle japonica> indica / indica / indica / indica / late japonica> Indica or early maturing medium and medium indica / early or middle japonica; it is also restricted by wild and restore genetic and epigenetic genes contained in the indica parent, and the indica / japonica hybrid generation with the indica wild restorer line was obviously weakened in its growth period , And related to the size of parents’ indica and japonica genetic distance. The heterosis of hybrid generation increased with the expansion of genetic distance between parents and indica.