甜高粱茎秆含糖量相关性状的遗传分析  

Genetic analysis of stalk sugar content related traits in sweet sorghum(Sorghum bicolor)

作　　者：卢峰[1,2] 邹剑秋 段有厚[2] 吕香玲[1] 

机构地区：[1]沈阳农业大学农学院,沈阳110866 [2]辽宁省农业科学院高粱研究所,沈阳110161

出　　处：《中国农业大学学报》2012年第6期111-116,共6页Journal of China Agricultural University

基　　金：农业部现代农业产业技术体系项目(CARS-06);国际合作项目(CFC/FIGG/41);948项目(2012-Z54)

摘　　要：为探讨甜高粱茎秆含糖量相关数量性状的遗传基础,以粒用高粱品系LR625(P1)和甜高粱品系Rio(P2)为亲本杂交构建的一组包含4个世代的遗传群体(P1、P2、F1、F2:3),采用数量性状主基因+多基因混合遗传模型,对茎秆含糖量(混合锤度)、出汁率和茎秆鲜重性状进行了遗传分析。结果表明:茎秆含糖量符合E-1模型,性状是由两对主基因+多基因遗传模型控制的,主基因作用方式包括加性、显性和上位性3种效应。其中多基因效应高于主基因效应,遗传率分别为48.89%和39.52%。环境效应较小,占总表型方差的11.59%;出汁率性状符合B-5模型,即性状表现受2对主基因遗传控制,基因作用方式为完全显性作用。遗传力决定了出汁率表型变异的75.3%,环境因素影响24.7%,该性状的表现受遗传因素和环境因素共同影响;茎秆鲜重符合E-2模型即两对加性-显性主基因+加性-显性多基因遗传模型,无上位性效应,性状的主基因效应大于多基因效应,主基因遗传率为58.85%,多基因遗传率为17.63%,环境因素影响占23.52%。A genetic segregation analysis of stalk sugar content related traits was made with the parents of LR625,a grain sorghum variety（P1）,Rio,a sweet sorghum variety（P2） and their F1 and F2：3 populations by using the mixed major gene plus poly-gene inheritance model.The results suggested that the genetic control of the stalk sugar content（brix） is consistent with E-1 model,the trait is controlled by two major genes with additive-dominant-epistatic effects and poly-genes.The poly-genes effects were higher than major gene effects,and the heritability of major genes and poly-genes were 48.98% and 39.52%,respectively.Environmental effects accounted for 11.59% of total phenotypic variance.Juice ratio was consistent with B-5 model,the trait is controlled by two major genes with dominant effects.Heritability account for 75.3% of phenotypic variation,and environmental factors accounted for 24.7%.Stalk fresh weight was consistent with E-2 model,the trait was controlled by two major genes with additive-dominant effects and poly-genes with additive-dominant effects.Heritability of major genes was 58.85%,and heritability of poly-genes was 17.63%,environmental factor effects accounted for 23.52%.

关 键 词：甜高粱 茎秆含糖量 出汁率 茎秆鲜重 遗传分析 

分 类 号：S566.5[农业科学—作物学]