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用4×5双列杂交研究大麦各节间长度的杂种优势及基因效应,结果表明:各节间长度的杂种优势均存在较大的变异,但以倒二、三、四节间长度的杂种优势较强,而倒一和五节间的杂种优势较弱。节间长度的遗传符合加性—显性模型,但加性效应更重要。平均显性度与杂种优势表现一致。控制倒一、二节间长度的有较多显性基因,而控制基部节间长度的隐性基因较多。除倒一节间长度与粒重呈显著正相关外,其它各节间长度与产量构成因素的相关性均不显著。杂种亲本选配时,应注意控制中部节间的长度。
The heterosis and gene effect of each internode length of barley were studied by 4 × 5 double crosses. The results showed that the heterosis of each internode length varied greatly. However, The advantage is strong, while the down one and five sections of the heterosis is weaker. The internode length is in line with the additive-dominance model, but additive effects are more important. The average dominance is consistent with the heterosis. There are more dominant genes controlling the length between the first and second nodes, and more recessive genes controlling the length of the basal internodes. Except for the significant correlation between the length of the internodes and the grain weight, the correlations between the length of other internodes and the components of yield were not significant. Hybrid parents matching, should pay attention to control the length of the central internode.