鲜食糯玉米货架期苞叶相关性状的配合力及其遗传效应分析

Analysis on Combining Ability and Genetic Effect of Bract Related Traits Related Characters of Fresh Waxy Corn

为了明确鲜食糯玉米货架期间苞叶相关性状的配合力及其遗传效应,选用6个自交系为父本、6个自交系为母本,按不完全双列杂交设计组配得到36个组合,对6个苞叶性状进行配合力分析和遗传参数估计。结果表明,苞叶含水量、苞叶层数、苞叶长、苞叶宽和苞叶总面积的一般配合力方差分析均达极显著水平,苞叶叶绿素含量达显著水平。苞叶性状遗传参数基因型方差均大于环境方差,主要受基因型的影响;GCA方差均大于SCA方差,表明以基因的加性效应为主。各性状的狭义遗传力大小依次为苞叶层数>苞叶叶绿素含量>苞叶宽>苞叶长>苞叶含水量>苞叶叶面积,苞叶含水量、苞叶叶绿素含量、苞叶长、苞叶宽、苞叶层数的狭义遗传力均大于50%,表明这些性状可以在早代进行选择。

To clarify the combining ability and genetic effects of bract related traits of fresh waxy corn during the shelf life,thirty-six combinations were obtained using an incomplete diallel hybridization design with 6 inbred lines as male parents and 6 inbred lines as female parents.Combining ability analysis and genetic parameter estimation were performed on 6 bract traits.The results showed that the variance analysis of general combining ability for water content,number of layers,length,width,and total area of bracts reached a very significant level,and the chlorophyll content of bracts reached a significant level.Genotypic variance of genetic parameters of bract traits was greater than environmental variance,which was mainly affected by genotype;the variance of GCA was greater than that of SCA,indicating that the additive effect of genes was dominant.The narrow heritability of each trait was in the order of bract layer>bract chlorophyll content>bract width>bract length>bract water content>bract leaf area.The narrow heritability of bract water content,bract chlorophyll content,bract length,bract width,and bract layer number was all greater than 50%,indicating that these traits can be selected in the early generation.