利用NCII设计,对玉米生产上常用的5个骨干黄改系的株型性状进行配合力及遗传参数分析。结果表明,株高与雄穗长呈极显著正相关,与雄穗分枝数呈极显著负相关;雄穗分枝数与雄穗长、穗位高和棒三叶夹角呈极显著负相关。雄穗长、雄穗分枝数和穗位高的遗传力较高,适宜在早代选择;株高和棒三叶夹角的遗传力较低,适宜在高代进行选择。黄改系lx9801的株高和雄穗长一般配合力高,特殊配合力方差大,在杂交组合的株高和雄穗长选配中具有重要的利用价值;浚926和浚928的利用应注意改良其穗位偏高的缺点。自交系昌7-2在株高上的特殊配合力和总配合力效应都较好,雄穗分枝数多,适合作父本;自交系K17的株高特殊配合力方差大,穗位高的总配合力效应小,在降低穗位高方面具有较大的利用潜力。 The NCII design was used to analyze the combining ability and genetic parameters of plant type traits of five lines of yellowing transformation of maize. The results showed that there was a significant positive correlation between plant height and tassel length and a significantly negative correlation with the number of tassel branches. The number of tassel branches had a significant negative correlation with the length of tassel, Related. Tassel length, tassel branch number and ear height are higher, which are suitable for selection in early generation. The heritability of plant height and angle of cloverleaf is low, which is suitable for selection in high generation. Yellow modified line lx9801 longevity and tassel length of the general high combining ability, special combining ability variance, in the hybrid combinations of height and tassel long matching has important value; dunk 926 and jun 928 should pay attention to the use of its improved The shortcomings of high ear position. Inbred line Chang 7-2 had better specific combining ability and total combining ability in plant height, with more branches and more suitable male parents. Inbred line K17 had greater variance with plant specific combining ability The high total combining ability is small and has great potential in reducing ear height.