白肋烟主要经济和品质性状的杂种优势及其遗传分析

Heterosis and genetic analysis of main economic traits in burley tobacco

选用6个白肋烟品种采用GriffingII双列杂交模型设计21个基因型处理,基于加-显模型研究分析白肋烟4个主要经济性状和2个品质性状的杂种优势及其遗传特性。结果表明白肋烟杂种优势在各主要经济、品质性状间及杂交组合间的表现存在差异,其中,上等烟率具有较强的群体平均优势表现,群体平均优势结果与纯显性效应△值的分析结果一致,产量、产值、均价、上等烟率、烟碱表现为正向杂种优势,总氮含量表现为较强的负向群体平均优势;上等烟率表现出明显的正向群体超亲优势,总氮含量表现较强的负向群体超亲优势,产值、均价性状表现出较小的正向群体超亲优势,产量和烟碱含量表现出较弱的负向超亲优势。6个性状的广义遗传率(HB)在0.21-0.66之间,表明白肋烟主要经济、品质性状的表型变异受环境及随机误差的影响较大;狭义遗传率(HN)大小顺序为,烟碱>产量>均价>产值、上等烟率、总氮。遗传效应方差分量估算结果表明产值、上等烟率、总氮含量的遗传变异主要表现显性效应,产量、均价和烟碱含量的遗传变异由加性效应和显性效应控制。

Heterosis and inheritance characters of 4 economic traits and 2 quality characters were studied based on A-D genetic model for 21 genetic entries designed by Griffing II diallel cross method of 6 burley tobacco varieties.Resulted showed that heterosis was varied in different economic traits and quality characters as well as different crossing combinations.Population heterosis over parent mean(Hpm)and the △ value of homozygous dominance effects indicated that five quantitative traits,including rate of first ...