不同种植季节下水稻茎杆粗度遗传分析

摘要

Three rice parents with great difference in clum thickness CB1 (11.0 mm), CB4 (15.5 mm)and CB7 (11.5 mm)were chosen to construct the combines CB1 × CB4 and CB7 × CB4, also the corresponding P1,F1, P2, B1, B2, F2 populations were established and planted in the middle and late planting seasons and the clum thickness traits were checked, respectively. The Akaike's information criterion ( AIC ) of the major genes plus polygenes mixed inheritance model was used to indentify the existence of major genes affecting quantitative traits in B1, B2, F2 populations, and when the major genes existed, the genetic effects of the major genes and polygenes and their genetic variance were estimated through segregation analysis. One additive major gene plus additive -dominance polygenes was the most fitted genetic model for this trait in the all B1,B2, F2 populations in the two planting seasons. The heritability values of the major genes varied from 27.60 percent to 63.69 percent and those of polygenes varied from 1.39 percent to 30.07 percent, and the total heritability values were from 39.43 percent to 82.01 percent. The heritability of this trait was affected by planting seasons and the combinations.%选择茎杆粗度差异大的3个亲本CB,(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、B1、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.