采用裂区和NCⅡ试验设计,对Iodent种质WY11、塘四平头群自交系“四287”及其4份遗传改良系进行了耐密性和配合力研究.结果表明:6个自交系中WY11的植株最高(208.2 cm),穗位较高(80.2 cm),秃尖长中等(0.86 cm),空秆率高(2.2％),对密度压力反应较敏感,不耐密植;四287的植株最矮(173.5 cm),穗位较矮(57.8 cm),秃尖短(0.12 cm),空秆率低(0.3％),对密度压力反应不敏感,耐密性好.W87-3的株高、穗位、空秆率、秃尖长均值分别为180.4 cm,64.2 cm,0.4％,0.93 cm,对密度压力反应敏感性弱,具有耐密植潜力;W87-1、W87-2、W87-4,对密度压力反应敏感,耐密性较差.WY11的一般配合力效应值为正向最高(3.57),W87-3和四287的一般配合力效应值较高(3.27,3.22).在高密度下筛选出四144×WY11和四144×W87-3两个总配合力效应值高的组合,具有高产潜力.W87-3是改良成功的自交系,具有重要的应用价值.%In the study,WY11,Si287 and four improved lines were crossbred with five key inbred lines by NCII mating design.The density-tolerance and combining ability were studied by Split-plot experiment design and Randomized block design.The results showed that inbred line WY11 had the highest plant (208.2 cm),higher ear weight (80.2 cm),middle ear tip length (0.86 cm),higher empty stem(2.2％)and lower density-tolerance,and it was very sensitive to density pressure.Si287 had the lowest plant (173.5 cm),lower ear weight (57.8 cm),short tip length (0.12 cm),lower empty stem (0.3％)and high density-tolerance,and it was insensitive to density pressure.Plant height,ear height,empty stem and tip length of W87-3 were 180.4 cm,64.2 cm,0.4％ and 0.93cm,respectively.It had high density-tolerance and was averagely sensitive to density pressure.Density-tolerance of W87-1,W87-2 and W87-4 was lower.WY11 had the highest general combining ability (3.57),and W87-3 and Si287 had higher general combining ability (3.27 and 3.22).Si144×WY11 and Si144×W87-3 had higher total combining ability and potential utilization in maize breeding,and could be used to breed maize variety of high yield and dense planting.W87 -3 was a successful improved line.
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