辽宁省不同年代玉米杂交种产量及杂种优势比较

Comparisons of Maize Heterosis in Different Years in Liaoning Province

试验研究了不同年代玉米产量的变化趋势、杂种优势与亲本产量和杂交种产量的相关关系,利用相关分析和通径分析的研究方法,分析了影响产量的8个主要农艺性状与产量的关系。相关分析结果表明:株高、穗位高、茎秆强度、穗长、穗粗与产量呈正相关,植株较高、穗位较高、穗较长较粗的杂交种产量一般比较高,通过对这几个性状进行选择可以显著提高杂交种的产量水平。通径分析结果说明,各性状对产量的直接作用大小依次为穗位高>穗长>穗粗>株高>茎秆强度>出籽率>穗行数>百粒重。穗位高对产量的直接效应最大,在选择时应着重对穗位高的选择。

In this paper, changing trend of maize hybrid yield and the correlation of heterosis, parent yield and hybrid yield was studied. By the method of correlation analysis and path analysis, the relationship of eight agricultural characters affecting yield and the yield was analyzed. From 1970s, the hererosis of maize yield presented the trends of "up-up-down"with the variety replacement. The hybrid herotosis was the result that male-parent inbred, female-parent inbred and mid-parent interacted with each other. ...