柞蚕茧产量性状的遗传分析

Genetic Analysis of Yield Traits of Antheraea pernyi

柞蚕茧产量是柞蚕最重要的性状之一,为了探明产量性状的遗传构成,应用数量性状基因位点(QTL)检测体系的主-微位点组遗传分析方法,对7个亲本及其21个杂交组合进行了遗传分析。结果表明,柞蚕的产茧量是由3对主基因和微效多基因构成,其中主基因遗传率为48.52%,多基因遗传率为12.39%。遗传效应分析结果表明,主位点组杂合显性效应所占的比例远大于加性效应,说明对于柞蚕茧产量性状应多利用其杂交优势用于生产。同时筛选出了可用于生产的产量性状优良的杂交组合P_1×P_5、P_1×P_6、P_2×P_3和用于品种改良的杂交组合P_1×P_3。

The cocoon yield of Antheraea pernyi is one of the most important characters of Antheraea pernyi. In order to find out the genetic composition of yield traits, the genetic analysis of 7 parents and 21 crosses of Antheraea pernyi were carried out by using the principal microlocus group method of quantitative trait loci （QTL） detection system. The results of genetic effect analysis show that the proportion of heterozygous dominant effect in the main locus group is much larger than that of additive effect, which indicates that the heterozygous effect should be used more in production. Excellent cross combinations P1×P2、P1×P6、P2×P3 and P1×P3 for hybrid improvement combinations were also screened.