茄子株高性状鉴定与遗传分析

Identification and Genetic Analysis of Plant Heigth in Eggplant (Solanum melongena L.)

以长茄高代自交系125和126构建的茄子6个不同世代的遗传群体〔P1、P2、F1、F2、 B1(125×F1)、B2(126×F1)〕为试材,利用主基因+多基因混合数量性状遗传模型对茄子的株高性状进行多世代遗传联合分析。结果表明:供试亲本株高性状差异显著,分离世代株高性状数值均呈单峰的偏正态分布,属于数量性状遗传。多世代遗传联合分析结果显示茄子株高性状的最适遗传模型为C-0模型,不存在主基因遗传效应,表现为多基因控制的加性-显性-上位性遗传模式。采用二阶遗传参数进一步分析株高的多基因遗传效应,结果显示,茄子分离世代F2、B2的多基因遗传率分别为49.24%、22.77%,茄子株高以多基因遗传为主。

Taking 6 genetic populations〔P1,P2,F1,F2,B1(125×F1),B2(126×F1)〕constructed by crossing eggplant inbred line 125 and 126 as test material,this paper conducted conjoint analysis of multigenerations on eggplant plant height trait using major gene and polygene mixed inheritance model.The results showed that there were significant genetic differences in plant height of tested parent,and the plant height traits value of segregative generations all showed unimodal partial normal distribution,belonging to quantitative inheritance.The results also showed that the most suitable genetic model for plant height trait was C-0 genetic model.There was no major gene genetic effect existed,showing a genetic model controled by polygene with additive-dominance-epitasis.The polygene genetic effects of plant height was further analyzed according to the second order genetic parameters.The results showed that the polygene heritability in F2 and B2 eggplant segregative generations were 49.24% and 22.77%,respectively.The plant height of eggplant gave priority polygene inheritance.