【摘要】 根据双交组合方式的交配设计，运用Ｃｏｃｋｅｒｈａｌｎ广义遗传模型的建模原理，提出了适用于分析作物农艺性状的加性－显性－上位性模型（ＡＤＡＡ模型），推导了不同世代群体的遗传效应分量。采用不同世代对双交组合ＡＤＡＡ模型及其缩减的ＡＤ模型进行蒙特卡罗模拟比较，结果表明：采用 ＭＩＮＱＵＥ（ １）法可以无偏估计各遗传方差分量，采用 ＡＵＰ法能够有效地预测各遗传效应值。分析ＡＤＡＡ模型的世代数以不少于３个（亲本、单交Ｆ和双交Ｆ１）为宜，分析缩减的ＡＤ模型则只需２个世代（亲本和双交Ｆ１）即可。在考虑上位性效应的情形下，根据亲本及其杂交组合遗传效应的无偏预测值，提出了预测双文组合农艺性状杂种优势的新方法。最后对基因型×环境互作和杂种优势互作离差等有关问题进行了讨论。更多还原

【Abstract】 According to the double-cross mating design and using principles of Cockerham’s general genetic model, a genetic model with additive, dominance and epistatic effects (ADAA model) was proposed for the analysis of agronomic traits.Components of genetic effects were derived for different generations. Monte Carlo simulation was conducted for analyzing the ADAA model and its reduced AD model by using different generations. It was indicated that genetic variance components could be estimated without bias by MINQUE(l) method and genetic effects could be predicted effectively by AUP method, at least three generations (including parent F1 of single cross and F, of double-cross) were necessary for analyzing the ADAA model and only two generations (including parent and F, of double-cross) were enough for the reduced AD model. When epistatic effects were taken into account a new approach for predicting the heterosis of agronomic abets of double-crosses was given on the basis of unbiased prediction of genotypic merits of parents and their crosses. In addition, genotype ×environment interaction effects and interaction heterosis due to G×E interaction were discussed briefly.更多还原