应用作物数量性状主位点组分析方法分析了甘蓝型油菜 (BrassicanapusL .)品种“宁杂 1号”的保持系、恢复系与 10个供体亲本间组合的单株种子产量差异 ,估算出代表外源有利基因的遗传参数 μG′值 ,以此作为标准选择供体亲本 ,改良宁杂 1号的杂种优势。单株产量分析结果 ,虽然 10个供体亲本与“宁R1”间杂种组合单株产量的杂种优势明显 ,但 10个供体亲本中只有P6(“宁油 10号”)与“宁B6”间杂交组合产量比宁杂 1号明显提高(7 78% )。这表明通过直接选择恢复系来提高宁杂系统杂种组合的杂种优势的效率有限。 10个供体亲本的单株产量的G位点组效应 (μG′)值分析结果 ,有 3个供体亲本的 μG′值较高 ,达到显著水平 (P <0 0 5 )。这 3个亲本分别为“五十铃”、“苏油 1号”和“中油 82 1” ,它们可使宁杂 1号的单株产量分别获得 2 8 49%、2 9 70 %和 45 6 6 %的提高 ,表明这 3个亲本可作为候选供体亲本来改良宁杂 1号的杂种优势。此外 ,研究结果还显示改良恢复系的配合力是提高宁杂 1号系统组合杂种优势的有效途径 The analysis of main locus group of crop quantitative traits was used to analyze the difference of single seed yield between the maintainer line and restorer line of Brassicanapus L. variety Ningning 1 and the combination of 10 donor parents. Genetic parameters of exogenous favorable gene μG ’values, as a standard selection of donor parents, to improve Ningza 1 heterosis. The yield per plant analysis showed that although the heterosis of single hybrids between 10 donor and Ning R1 was obvious, only P6 (“Ningyou 10”) and “Ning B6” The yield of inter-hybrid combinations was significantly higher than that of Ning-n-1 (78%). This shows that the efficiency of improving the heterosis of heterosis hybrids by direct selection of restorer lines is limited. The results of G-site group effect (μG ’) analysis showed that there were 3 donor parents with higher μG’ values ​​at the significant level (P <0.05). The three parents were “Isuzu”, “Suyou 1” and “Zhongyou 82 1”, which could make the yield per plant of Ningza 1 reach 289%, 2970% and 456% respectively, The results showed that these three parents could be used as candidate donor parents to improve Ningza 1 heterosis. In addition, the results also show that improving the combining ability of restorer lines is an effective way to improve the hybrid heterosis of Ningza 1 system