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用质量－数量性状的混合分布遗传模型对２个水稻矮秆×高秆的Ｆ_２群体（组合１：Ｈ３５９／Ａｃｃ８５１８；组合 ２：Ｈ３５９／Ａｃｃ８５５８）的株高遗传进行了研究．结果表明：１）存在 １对主基因的分离，高秆对矮秆完全显性； ２）这对主基因的效应大小在两个组合中非常相近，说明这对主基因在不同遗传背景中效应稳定，与微基因之间无明显互作，这对于育种应用是有利的；３）两组合中由微基因分离引起的遗传方差大小相近，微基因的平均显性效应皆是减效方向，且数值上也相近，而平均加性效应则皆呈增效方向，但数值上相差很大，说明两组合中发生分离的微基因的数目可能相似，但微基因在双亲间的分布情况却大不相同；４）亲本表型方差（亦即环境方差）与亲本均值呈明显正相关关系，高秆的环境方差要比矮秆大得多，因而在不同主基因型中，微基因的遗传力表现不同，这在育种实践中应引起注意．
The heredity of plant height in two rice dwarf × tall culm F2 populations (combination 1: H359 / Acc8518; combination 2: H359 / Acc8558) was studied using a mixed-population genetic model with mass-quantity traits. The results showed that: 1) there was one major gene segregation, and the high stalk was completely dominant to the dwarf; 2) the effect size of the two major genes was very similar in the two combinations, indicating that the effect of the two major genes on different genetic backgrounds Which is good for breeding application. 3) The genetic variance caused by micro-gene separation in both combinations is similar, and the average dominant effect of micro-gene is the direction of reduction and While the average additive effect was in the direction of increasing efficiency, but the values were quite different, indicating that the numbers of isolated microgenes in the two combinations may be similar, but the distribution of the microgenes in the parents is quite large 4) The phenotypic variance of the parents (ie, the variance of the environment) showed a significant positive correlation with the mean of the parents, and the variance of the culm was greater than that of the dwarf. Therefore, in different main genotypes, the heritability Different, this should attract attention in breeding practice.