Institut für Biologie der Universität Tübingen, Lehrstuhl für Genetik, Tübingen, BRD.
Theor Appl Genet. 1972 Jan;42(1):16-24. doi: 10.1007/BF00306073.
Six groups of genetic materials were developed in a cruciferous garden plant, Matthiola incana R. Br., to produce simplified genetic systems of a pair of loci in each group. There were only two alleles at each locus, which were directly involved in the modification of anthocyanins in the plant tissue. The parental lines and their F1's in each group constituted an ideal 4 × 4 diallel cross and satisfied all but one condition necessary for a valid diallel analysis. Nonallelic interaction was the only possible offending postulate.The diallel analysis of the data on anthocyanin content in the flower tissues and a comparison of the results with that of a relatively straightforward method of analysis indicated that in the presence of epistasis, the dominance ratio (H1/D) ceases to be a reliable measure of the average degree of dominance. In such situations additional genetic information obtained from the diallel analysis are not in agreement with the expectations on the basis of the already available genetic information on the materials. The estimator H2/4 H1, a measure of average value of the product of alleles with positive and negative effects, seemed to remain unaffected by epistasis. The Wr/Vr regression analysis does not always permit the detection of nonallelic gene interactions. The results suggest that duplicate interaction may escape detection by the regression analysis.
在十字花科花园植物堇菜属植物中开发了六组遗传材料，以产生每组中一对基因座的简化遗传系统。每个基因座只有两个等位基因，它们直接参与植物组织中花青素的修饰。每组中的亲本系及其 F1 构成了理想的 4×4 双列杂交，并满足了有效双列分析所需的除一个条件外的所有条件。非等位基因相互作用是唯一可能的有问题的假定。花青素含量数据的双列分析，并将结果与相对直接的分析方法进行比较表明，在存在上位性的情况下，显性比（H1/D）不再是平均显性程度的可靠衡量标准。在这种情况下，从双列分析中获得的额外遗传信息与基于材料已有遗传信息的预期不一致。杂种优势比 H2/4 H1 的估计值，衡量具有正效应和负效应的等位基因的乘积的平均值，似乎不受上位性的影响。Wr/Vr 回归分析并不总是能够检测非等位基因的基因相互作用。结果表明，重复相互作用可能逃避回归分析的检测。
