基因分散态组合的检测及遗传分析(英文)

Detection and Genetic Analyses of the Gene Dispersed Cross: Some Theoretical Considerations

在加性-显性模型的基础上提出了检测基因分散态组合的三种方法:(1)检验F_2表型方差与环境方差的同质性以及六个群体P_1,P_2,F_1,F_2,B_1(F_1×P_1)和B_2(F_1×P_2)间方差的同质性,(2)检验上述家系均值间的差异显著性,(3)比较从分离世代经分裂选择所获两类极端品系间组合与基因分散的原始亲本间组合在遗传参数估计值上的差异.通过加性-显性模型检验、有效因子数和基因联合-分散度的估计以及重组近交系分离极限的预测,这些方法所检测到的基因分散态组合可进一步用于揭示数量基因的遗传特性.讨论了这类信息在植物改良中的应用.

Based upon the additive-dominance model, three methods were developed to detect the gene dispersion. (1) testing the homogeneity between F2 phenotypic variance (VF2) and the environmental variance (VE ) , and among variances of six populations, P1, P2, F1, F2, B1 ( F1 ×P1 ) and B2 ( F1× P2 ) , ( 2 ) testing the differences among these family means and ( 3 ) comparing the genetic parameters of the cross between the opposite extreme strains derived from segregating generations by disruptive selection with those of the cross between the original parents in which genes are dispersed. The gene dispersed cross detected by these methods could be further used to reveal genetic characteristics of the genes controlling the quantitative trait in question through a test of an additive-dominance model, estimation of the number of effective factors, evaluation of the degree of gene association-dispersion and prediction of limits to the range of recombinant inbred lines. Applications of this information to plant improvement were discussed.