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本文以来源不同的 9个玉米自交系及其按双列杂交组合的 36个杂交种为材料 ,研究了玉米幼苗根系对硫酸盐 (Na23 5SO4 )亲和性 (Km)的基因效应。结果表明 ,Km的遗传为加性—显性—上位性模型。控制Km的基因作用方式为超显性 ,显性作用大于加性作用 ,显性方向指向减效。亲本中正、负效基因的分布不等 ,显性等位基因的频率高于隐性等位基因的频率。自交系合二和2 92含显性基因较多 ,认为这二个自交系是改良根系对营养吸收亲和性的优良亲本材料
In this study, 9 maize inbred lines from different origins and their 36 cross combinations were used as materials to study the genetic effect of maize seedling root on the affinity (Km) of sulphate (Na23 5SO4). The results showed that the inheritance of Km was additive-dominance-epistatic model. Km gene control mode of action for the over-dominant, the dominant effect is greater than the additive effect, the dominant direction of the reduction effect. The positive and negative parents of the distribution of the genes, the dominant allele frequency is higher than the frequency of recessive alleles. There were more dominant genes in two inbred lines and two in 1992, which were considered as excellent parents for improving the affinity of root system for nutrient uptake