冬小麦品种抗寒性遗传研究

Genetical Study on the Resistance to Coldness in Wheat Varieties

以Ｇｒｉｆｆｉｎｇ双列杂交模式Ⅱ设计，对小麦品种抗寒性数量性状进行了力遗传效应和Ｆ１抗寒性遗传规律研究。结果表明，冬小麦品抗寒性一般配合力遗传方差δｇｃａ和特殊配合力遗传方差δｓｃａ均达到１％显著水平，表明抗寒性表现受加性与非加性基因的共同作用；并且一般配合力方差大于特殊配合力方差，表明加性较非加性基因效应占有绝对优势；杂种Ｆ１抗寒性多为中间性遗传，但也有个别组合呈抗寒亲本显性或杂种优势，Ｆ１...

The combining ability was analysed with the criffing 5×5 diallel model Ⅱ. The results indicated that the δ_(gca)~2 and δ_(sca)~2 for resistance to coldness were all significant at 1% or 5% level, and were therefore controlled by both additive and non-additive gene effect, but the δ_(gca)~2 was greater than δ_(sca)~2. It showes that the effect of the additive gene effect was much more important than the non-additive gene effect. Genetical studies on the F_1 resistance to coldness showed that most of the crosses were mid-genetical, but very few of them also presented heterosis. The correlative coefficient between the crossing mean value in the F_1 resistance to coldness and the mean value of their parents was significant. When parents with high resistance to coldness were used as female, that of F_1 were all high.