色素万寿菊W217橙红色花色遗传性状研究

采用W217×W203组合的P1、P2、F1、B1、B2和F2共6个世代的花色色调值,利用主基因+多基因混合遗传模型多世代联合分析方法进行遗传分析.结果表明,色素万寿菊橙红色花性状最优遗传模型为两对加性-显性-上位性主基因+加性-显性-上位性多基因遗传模型,以主基因遗传效应为主,多基因效应为辅.主基因加性效应、显性效应和上位性效应作用很大,主基因遗传力受环境影响较小.在F2群体中主基因遗传率为49.13％,多基因遗传率为48.25％；在B1群体中主基因遗传率为84.23％；在B2群体中主基因遗传率为74.41％,多基因遗传率为18.24％.

Analysis of the Qualitative-quantitative Geneticmodels of Orange Color Petal Tone Value in Tagetes erecta L.

Orange flower color is a useful indicator in Tagetes erecta L..It was used in correlative selection and purity test and was also used as a genetic traitmarker.In the present study the color quantified by tone value in order to investigate the geneticmodel of flower color.Six generations(P1,P2,F1,F2,B1and B2) from W217×W203 were analyzed with a mixed geneti cmodel for major genes and poly genes.Results showed that orange color in marigold was a quantitative trait and its inheritance fitted to a mixed genetic model of two major genes with additive-dominant-epistatic effects plus polygenes with additive-dominant-epistatic effects(E-0 model).Among them,the additive,dominant and epistatic effects of the two major genes were equally important.The effects and heritability of major genes were high with low environmental influence,and that of the polygenes were also relatively low.The estimated heritability rates of the two major genes were 49.13% in F2,84.23% in B1,74.41% in B2.The estimated inheritability rates of the polygenes were 48.25% in F2,18.24% in B2.