小麦遗传距离与杂种优势关系的最优拟合

Study on the Bcst Fittirig of Relationship between Genetic Distance and Heterosis in Wheat

以１０个小麦品种和按双列杂支配制的４５个组合为材料，用近代回归分析的方法对小麦遗传距离与产量杂种优势的真实关系进行了逼近。并用报道的玉米、棉花和水稻的数据进行了验证。结果表明：遗传距离与产量杂种优势关系的最优拟合形式为Ｙ＝ａｘｂｅ（ｃｘ）（ａ、ｂ＞０，ｃ＜０）。讨论了异常点、样本容量和数据结构对拟合形式的影响。

Tlie best fitting of relationship between genetic distance and heterosis was studied in wheat by modern regression analysis.The materials were composed of 10 varieties and their 45 combinatlons by diallel mating design.The results wer tested with the deta of maize,cotton and rice.The results showed that the best relationship between genetic dis-tance and heterosis for vield is Y=axbe(cx)(a,b>0;c<0)and the effects of outlier,numberof sampie and deta strecture of sample on the best fitting were discussde.