摘要:
对1979、1983～1986五年的小麦育种材料和杂交组合的抗赤霉病性进行接种鉴定。71个组合调查结果表明,抗病品种×感病品种组合杂种F1抗赤霉病性大多倾向抗病亲本,表现显性效应。杂种F2病情呈连续分布,亦表现显性效应。小麦对赤霉病的抗性主要表现为部分显性。抗赤霉病性遗传力偏低,18个组合平均广义遗传力为45.14%,但组合之间差异很大,变幅为9.05～73.53%。杂种F1抗病亲本、感病亲本和中亲值都有正相关关系。F2单株与F3株系的相关系数为0.4616**和0.4627**,早代选择单株有一定效果,但杂种后代应连续接种鉴定和选择。
Abstract:
In 1979 and 1983-86, the breeding materials and hybridization crosses of wheat were inoculated and identified on scab resistance. Investigation on 71 crosses indicated that the scab resistance tended to resistant parents with F1 hybrids,which were derived from the crosses of resistant variety? susceptible variety and which showed dominant effect.Scab displayed continuous distribution with F2 generations, which also showed dominant effect.The resistance of wheat to scab mainly showed partially dominant effect.The heritability of resistance to scab was somewhat low-er; the average heritability in a broad sense was 45.14% in 18 crosses. However,the differences were large between the corsses,ranging from 9.05 to 73.53%.The resistance of F1 was positively correlated with resistant parents, susceptible parents and the meanparent values. The correlation coefficients were 0.4616**and 0.4627** between F2 plants and F3 families. Selecting the single plant at earlier stage was effective to a certain degree, but progenies should be identified and selected continuously.
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