Abstract: The genetic effects of some agronomic characters in two different cytoplasms indica-japonica hybrids were analyzed by using additive-dominant×cytoplasmic modle. The results showed significant interaction effects of nucleus and cytoplasm in plant height, panicle number per plant, flag leaf length and spikelet fertility. Because of the interaction effects, the prediction of F₁ genotype value and their heterosises over mid-parent on population mean were increased in plant height, panicle number per plant and flag leaf length, but they were decreased in spikelet fertility.

Key words: heterosis over mid-parent on population mean, indica-japonica hybrid, interaction effect of nucleus and cytoplasm, prediction of hybrid genotype value

摘要： 将5份籼型不育系及其保持系为母本与6份粳型或偏粳型广亲和系为父本的23对籼粳交不育系杂种(AW)和可育系杂种(BW)，应用核质互作混合线性模型对株高等8个主要农艺性状进行遗传分析。结果表明，株高、单株穗数、剑叶长和结实率等性状均存在显著或极显著的核质互作效应；不育质或可育质与核基因的互作使杂种F1的平均基因型预测值和群体平均优势在株高、单株穗数和剑叶长上得到明显增加，在结实率上则显著降低。

关键词: 籼粳交, 核质互作, F1基因型预测值, 群体平均优势