Xu Z C, Zhu J
Department of Agronomy, Zhejiang Agricultural University, Hangzhou, China.
Yi Chuan Xue Bao. 2000;27(3):247-56.
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(1) method and genetic effects could be predicted effectively by AUP method; at least three generations (including parent, F1 of single cross and F1 of double-cross) were necessary for analyzing the ADAA model and only two generations (including parent and F1 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 traits of double-crosses was given on the basis of unbiased prediction of genotypic merits of parents and their crosses. In addition, genotype x environment interaction effects and interaction heterosis due to G x E interaction were discussed briefly.
根据双杂交交配设计并运用科克伦通用遗传模型的原理，提出了一个包含加性、显性和上位性效应的遗传模型（ADAA模型）用于农艺性状分析。推导了不同世代的遗传效应组成部分。通过使用不同世代对ADAA模型及其简化的AD模型进行了蒙特卡罗模拟。结果表明，采用MINQUE(1)方法可无偏估计遗传方差分量，采用AUP方法能有效预测遗传效应；分析ADAA模型至少需要三代（包括亲本、单交F1和双交F1），而简化的AD模型仅需两代（包括亲本和双交F1）。当考虑上位性效应时，在对亲本及其杂交组合的基因型值进行无偏预测的基础上，给出了一种预测双交农艺性状杂种优势的新方法。此外，还简要讨论了基因型×环境互作效应以及由G×E互作引起的互作杂种优势。
