爆裂玉米膨胀倍数的遗传研究

Study on Inheritance of Seed Expansion Times in Popcorn

摘要:

试验选用8份遗传差异较大的爆裂玉米自交系做亲本,按Griffing方法2进行配制组合。对所获得的F₁代及部分组合的F₂代、回交世代和亲本材料进行系统的调查和探讨,研究了膨胀倍数性状在杂交后代的优势表现。结果表明:膨胀倍数性状存在杂种优势,在F₁代中,膨胀倍数性状呈正向优势的组合数目明显少于呈负向优势的组合数目,无显性的组合数目为0。膨胀倍数的遗传力较高,选择响应较大,这决定了膨胀倍数性状适于早代选择。通过计算说明至少有7对等位基因影响着膨胀倍数的表现,基因效应分析表明其遗传符合加性-显性模型,其中加性效应占主要地位。

Abstract:

In this experiment,8 popcorn breeds which have remarkable genetic divergence were selected to make crosses by method II of Griffing.F₁s of all crosses,F₂s of some crosses,back-crossing generation and parents were used to study inheritance of progenies on seed expansion times characters which included:hybrid preponderant performance,inheritable ability,selection responses,number of affection genes,gene effect.The results showed:seed expansion times character has hybrid preponderance.In F₁ generation,the number of positive preponderant crosses in seed expansion times character was obviously less than that of negative ones,the number of non-dominante crosses was 0.Seed times expansion character is suitable to select in early generation for its inheritable ability is higher and selective responsibility is bigger.Base on this study,there were at less 7 pairs allele genes controlled the performance of times of seed expansion character.Analysis of gene effect showed that genetics of seed expansion times character was fitted to the additive-dominante model,but additive effect was most important.