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选择茎杆粗度差异大的3个亲本CB1(11.0 mm)、CB4(15.5 mm)和CB7(11.5 mm),配制CB1×CB4和CB7×CB4组合,建立了相应的P1、F1、P2、B1、B2、F2群体,将其分为中、晚两个生产季节种植,考察了茎杆粗度性状。利用主基因+多基因混合遗传模型理论的Akaike信息准则(AIC)在B1、B2、F2代中鉴定影响数量性状的主基因存在与否,主基因存在时通过分离分析估计主基因和微效基因的遗传效应及所占总变异的分量。结果表明该性状在所有2个季别中B1、B2、F2中均符合1对加性主基因+加-显性多基因遗传模式,主基因遗传率为27.60%～63.69%,多基因遗传率为1.39%～30.07%,总基因型遗传率为39.43%～82.01%,茎粗性状的遗传率受种植季别及所配组合的影响明显。
Three parents, CB1 (11.0 mm), CB4 (15.5 mm) and CB7 (11.5 mm), were selected and their CB1 × CB4 and CB7 × CB4 combinations were selected to establish the corresponding P1, F1, P2, B1 , B2, F2 population, which were divided into the middle and the late two planting seasons, examined the stem trait traits. Using Akaike information criterion (AIC) of mixed gene model of major gene + polygene to identify the presence or absence of major genes affecting quantitative traits in B1, B2 and F2 generations, the major genes and minor genes were estimated by segregation analysis in the presence of major genes The genetic effects and the share of total variance. The results showed that the trait conformed to a pair of additive major plus additive-dominance polygenes in B1, B2 and F2 in all two seasons, and the heritability of major genes was 27.60% -63.69%. The polygene heritability And the heritability of total genotypes was 39.43% ~ 82.01%. The heritability of stem-diameter traits was significantly affected by the planting seasons and the combinations.