玉米茎秆抗倒伏相关性状的遗传效应分析

利用主基因+多基因混合遗传多世代联合分析的方法,对玉米自交系K12和A7110组配的正反交组合进行6个世代(P1、P2、F1、B1、B2、F2)联合分析.结果表明,茎粗正交组合中的最适模型为D-1模型(1对加性-显性主基因+加性-显性多基因),茎粗的反交组合的最适模型均为E-1模型(2对加性-显性-上位性主基因+加性-...

Genetic Effects Analysis of Stem Lodging Resistance Traits in Maize

In order to assist the lodging resistance breeding of maize stems and to understand the genetic characteristics of lodging resistance related characters of maize stems, six generations(P₁,P₂,B₁,B₂,F₁,F₂) of reciprocal crosses of K12 and A7110 were analyzed by major gene-polygene mixed inheritance model. The results showed that the optimal model of stem diameter orthogonal combination was D-1 model(one major gene and additive-dominant polygene), and the optimal model of stem diameter reciprocal cross combination was E-1 model(two major genes with additive-dominance-epistatic effects plus polygenes with additive-dominance effects). The most suitable model of thrust resistance combination was C model(additive-dominant epistatic polygenes). The polygenic heritability of backcross generation was 6.22% and 19.94%, respectively, and the polygenic heritability of backcross generation was 68.81% and 52.78% in reverse cross. In the process of maize breeding, according to the characters mainly controlled by polygenic inheritance, the method of recurrent selection in the generation with high heritability can enrich the target genes, which is conducive to improve the breeding efficiency.