玉米与四倍体大刍草杂交结实性的遗传分析  

Inheritance of Seed Setting Rate in Maize × Z.perennis Crosses

作　　者：兰海[1] 苏鹏[2] 周树峰[1] 曹墨菊[1] 唐祈林[1] 荣廷昭[1] 

机构地区：[1]四川农业大学玉米研究所,四川成都611130 [2]四川省原子能研究院,四川成都610101

出　　处：《核农学报》2014年第3期393-397,共5页Journal of Nuclear Agricultural Sciences

基　　金：国家“863”计划(2011AA10A103)

摘　　要：研究发现不同玉米材料与四倍体大刍草杂交,其结实性存在很大的差异,在普通玉米基因组中可能存在影响远缘杂交亲和性的基因。为研究这一现象的遗传本质和规律,本研究采用植物数量性状主基因+多基因混合遗传模型方法,对以玉米自交系975-12与R18为亲本组配的两套正反交6个世代群体与四倍体大刍草杂交的种子结实率数据进行了分析。结果表明:正交群体杂交结实性的遗传符合两对加性-显性-上位性主基因+加性-显性多基因混合遗传模型,反交群体杂交结实性的符合两对加性-显性-上位性主基因+加性-显性-上位性多基因模型。在正交组合中主基因遗传率在家系F2中最高,为88.9456%,多基因遗传率在家系B1中最高,为14.1564%;在反交组合中主基因遗传率在家系F2中最高,为87.2997%,多基因遗传率在家系B2中最高,为80.7618%。It was found that in the crosses of different maize and Z. perennis, the seed setting rate had great variation. There were genes in maize genome that affect the compatibility of distant crosses. In order to study the regulation mechanism for this phenomenon, this research used the major gene plus poly-gene model of quantitative traits to a joint analysis of multi-generations （P1,P2,F1,F2,B1,B2） to detect inheritance pattern of the seed setting rate of maize in the cross and back cross 975-12×R18. It showed that in the cross 975-12×R18, the seed setting rate was controlled by two additive-dominant-epistatic major-genes plus additive-dominant polygenes （the E-1 model）. However, in the cross R18×975-12, it was controlled by two additive-dominant-epistatic major-genes plus additive-dominant-epistatic polygenes （the E-0 model）. In the cross 975-12×R18, the heritability of the major gene was highest in the F2 population （88.9%）, and the highest heritability of the polygene was 14.2% in the B1 population. In the cross R18×975-12, the highest heritability of the major gene was also in the F2 population （87.3%）, and the highest heritability of the polygene was 80.8% in the B2 population.

关 键 词：玉米 四倍体大刍草 远缘杂交 主基因+多基因 结实性 

分 类 号：S334[农业科学—作物遗传育种]