数量性状主-多基因混合遗传的P_1、P_2、F_1、F_2和F_(2∶3)联合分析方法  

Identification of Major Gene and Polygene Mixed Inheritance Model of Quantitative Traits by Using Joint Analysis of P_1 , F_ 1, P_2, F_2 and F_(2:3) Generations

作　　者：王建康[1] 盖钧镒[1] 

机构地区：[1]国家大豆改良中心南京农业大学大豆研究所

出　　处：《作物学报》1998年第6期651-659,共9页Acta Agronomica Sinica

基　　金：国家自然科学基金项目

摘　　要：本文提出利用亲本P_1和P_2、杂种F_1,F_2和F_(2∶3)五世代联合分析数量性状主基因和多基因遗传的统计方法,共建立可供选择的单基因遗传、多基因遗传以及一个主基因+多基因混合遗传三类11个遗传模型;AIC信息准则用于选择最适遗传模型,通过适合性检验对所选择的遗传模型做进一步检验;以D类模型为例,给出参数估计EM过程的一般步骤。以邳县天鹅蛋(P_1)和1138—2(P_2)杂交组合为例,分析了大豆抗豆秆黑潜蝇性状的遗传,发现该性状符合主基因+多基因混合遗传模式,主基因的加显性效应分别为-1.86和-1.64,F_2世代主基因的遗传率为43.84％,F_(2∶3)家系世代主基因的遗传率为88.59％,F_2群体的抗感分界线为11≤x≤12,F_(2∶3)群体的抗感分界线为10.6≤x≤11.0。The statistical method for identification of major gene and polygene mixed in heritance of quantitative traits by using joint analysis of P1, F1, P2, F2 and F2:3 generations was proposed in this paper. Eleven genetic models were established, which could be classified into three types: single major gene inheritance, polygene inheritance and one major gene plus poly- gene mixed inheritance. The most suitable genetic model could be selected by using Akaike's In formation Criterion and could be further tested by using a set of tests of fitness. The EM algo rithm was derived for computing maximum likelihood estimates in D-type model, as an exam ple. Inheritance of resistance of soybean to the Agromyzid fly was analyzed by using the above method. Major gene and polygene mixed model was the most fitted genetic model for this trait. The additive and dominance effects of the major gene were estimated as-1. 86 and-1. 64, re spectively. The major gene heritability values of F2 and F2:3 were 43. 84% and 88. 59% , respec tively. The F2 individuals were classified into appropriate major gene genotypes according to the posterior probability values of F2 plants and F2:3 familits. The critical values of F2 and F2:3 to dis tinguish resistant and susceptable ones were drawn as 11≤x≤12 and 10.6≤x≤11.0.

关 键 词：数量性状 主基因 多基因混合 遗传模型 

分 类 号：S565.103.2[农业科学—作物学]