摘要
为给小麦遗传育种中籽粒性状改良提供参考,以小麦大粒品系0911-46为母本与小粒品系42杂交产生P1、P2、F1、BC1、BC2和F2共4个世代6个群体,应用主基因+多基因混合遗传模型多世代联合分析方法分析了小麦粒重、粒长、粒宽、粒厚的遗传特点。结果表明,千粒重、粒宽、粒厚都符合2对加性-显性-上位性主基因+加性-显性-上位性多基因遗传模型。2对粒重主基因都具有正向加性效应,可以增加粒重,但其互作效应有正有负且互相抵消,对粒重影响不大。粒宽和粒厚的显性效应为正向作用,有利于增加籽粒体积。粒长符合加性-显性-上位性多基因模型,无主基因。千粒重主基因+多基因遗传率在BC1、BC2、F2三个分离世代分别为88.02%、78.53%、87.82%;粒长多基因遗传率在3个分离世代分别为71.95%、61.64%、62.93%;粒宽主基因+多基因遗传率在3个分离世代分别为43.90%、32.69%和68.47%;粒厚主基因+多基因遗传率在3个世代分别为50.01%、42.86%和68.63%。所有籽粒性状中以粒重的遗传力最高。
Wheat kernel characters, including grain weight, grain length, grain width and grain thick- ness, are associated with yield tightly. 0911-46, the female parent, which had bigger grain size and grain weight, was crossed with ＂Line 42＂, which was relatively smaller in each trait, and produced six pedigrees of 4 generations （P1 , P2, F1, BC1, BC2 and F2）. The methods of multiple generations of conjoint analysis of major gene plus polygenes mixed inheritance model were used for genetic analysis of grain weight, grain length, grain width and grain thickness, so as to understand the genetic regu- larity of grain trait in common wheat. In this study, IECM （interated expectation and conditional maximization） was used to evaluate the related parameters in mixed distribution and then the compati- bility was tested through the judgment of AIC （Akaike＇s information criterion） values. Meanwhile, optimal genetic model was chosen during this analytic process and least square method was used to e- valuate the genetic parameters of wheat grain traits. Through variance analysis, grain weight, grain length, grain width and thickness showed significant quantitative properties. Phenotypic analysis showed that the grain weight was controlled by major genes and minor genes at the same time. The grain length was controlled by multiple genes. The grain width was controlled by major genes and mi- nor genes simultaneously. The grain thickness was controlled by more than one pair of major genes as well as several minor genes （modifier genes）. The results of genetic models demonstrated that the grain weight, grain width and grain thickness conformed to the genetic model of two additive-domi- nant-epistatic major genes plus additive-dominant-epistatic polygenes. Two major genes of grain weight had positive additive effects that could increase grain weight. Both positive and negative inter- action effect was found between the two major genes. Because of the similar effect value, the interac- tion effect was canceled each
出处
《麦类作物学报》
CAS
CSCD
北大核心
2013年第6期1119-1127,共9页
Journal of Triticeae Crops
基金
"十二五"农村领域国家科技计划项目(211AA100501)
西北农林科技大学唐仲英植物育种基金项目
关键词
小麦
籽粒特性
遗传模型
Wheat
Grain character
Inheritance model
