摘要
杂交F_1代各性状均有明显的杂种优势,组合和性状间的优势具有显著差异,以单株籽粒产量优势最强,其余依次为实粒数、穗长、株高、每穗小穗数和千粒重。仅有株高、穗长、实粒数三性状符合加性—显性模型和亲本的基因独立分布。株高和实粒数为部分显性,加性方差和显性方差分量均显著,基因的加性效应比显性效应更重要。穗长为超显性,显性基因效应比加性基因效应更重要。
Heterosis was manifested in the F_1s of barley(Hordeum distichum L.)and varied with cross combinations and traits.Grain yield/plant exhibitedthe highest heterosis,followed,in sequence,by fertile spikelet number,spike length,plant height,spikelets/spike,and 1000-seed weight.Plantheight,spike length and fertile spikelets were adequately fitted theadditive-dominance model,and the genes of the parents distributed ind-ependently.The inheritance of plant height and fertile spikelets appearedto be partially dominant with both additive and dominance variancesbeing significant.The additive effects of genes were more importantthan the dominance effects for the two traits.For spike length,on theother hand,dominance effects were more significant than additive effects.
出处
《西南农业大学学报（自然科学版）》
CSCD
1991年第2期191-196,共6页
Journal of Southwest Agricultural University
基金
国家自然科学基金
关键词
大麦
杂种优势
基因效应
heterosis
gene effects
barley
first generation of hybrid
