摘要
采用6×6完全双列杂交和改良单籽粒分析法,对胶稠度的遗传和基因作用进行了研究。试验结果表明,硬对中等或软胶稠度,中等对软胶稠度表现显性。亲子方差和协方差(Vr-Wr)分析指出胶稠度受到包括一对主效基因和若干微效基因(修饰基因)的控制,基因的平均显性作用为不完全显性。遗传参数分析表明在胶稠度的遗传中基因的显性作用和加性作用是重要的,狭义遗传力较高[h^2(ns)=0.78]。本文还讨论了在胶稠度改良中亲本选配和分离世代早期选择和重要性。
Inheritance and gene effects of gel consistency,one of important quality indexes,werestudied in a 6×6 full diallel cross by the modified single grain analysis.The result showed that hard gelconsistency was expressed as dominant trait over medium and soft one,and medium gel consistency wasdominant over soft one.Graphic analysis of Vr-Wr indicated the possible involvement of one major genealong with several minor genes(modifiers)in governing the expression of the trait.The regression linecutting the Wr axis above the point of the origin suggested the average dominance being within the rangeof incomplete dominance.Analysis of genetic components of variation showed both additive andnonadditive gene effect being of importance.The narrow-sense heritability of the trait was high:h^2(ns)=0.78.The importance on the parentage selection in the cross and the offspring selection in theearlier segregating generations in gel consistency improvement of rice is also discussed.
出处
《中国水稻科学》
CAS
CSCD
北大核心
1991年第1期25-28,共4页
Chinese Journal of Rice Science
关键词
稻米
胶稠度
双列杂交
遗传
基因
Rice gel consistency
Diallel cross
Inheritance
Gene effect
