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小麦抗寒性是由多基因控制的一种特性。用不同抗寒力的品种杂交,其 F_1代多数表现为中亲值或稍偏于中亲值,多数为不完全显性。小麦杂种 F_1代的抗寒性受杂种优势的影响,绝大多数呈正向优势。同一亲本与抗寒性类型不同的亲本杂交,受其亲本抗寒性影响,如果亲本抗寒性强,杂种 F_1抗寒性亦强;如果亲本抗寒性弱,杂种 F_1抗寒性亦弱。两亲抗寒性不同,对 F_1抗寒性的影响也不同,而且抗寒亲本起主导作用,但是不抗寒的亲本也起制约作用。母本对于 F_1代抗寒性有比较大的影响,F_1代抗寒性与双亲抗寒性平均值的相关与回归系数均极显著。
Cold hardiness in wheat is a feature controlled by multiple genes. The hybrids with different cold resistance varieties, the F_1 generation most of the performance in the pro-value or slightly deviate in the pro-value, most of them are not completely dominant. The cold-resistance of F1 hybrids of wheat was influenced by heterosis, and most of them showed a positive predominance. The same parent was crossed with the parents of different cold hardiness types. Affected by their parental cold resistance, cold hardiness of hybrid F1 was also strong if the parents were cold hardiness. Cold hardiness of hybrid F1 was also weak. The difference in cold resistance between parents has different effects on the cold resistance of F_1, and the cold parent plays a leading role, but the parent that does not resist cold also plays a role of restraint. The female parent had a great influence on the cold resistance of F1 generation, and the correlation coefficient and regression coefficient between the cold resistance of F1 generation and the average cold resistance of parents were all significant.