应用极大似然法分析大豆四向重组自交系群体株高与主茎节数的主基因遗传效应

Genetic Effects Analysis of Major Genes Underlying Plant Height and Main Stem Nodes in a Soybean Four-way Recombinant Inbred Lines Population through Maximum Likelihood Method

通过建立包括各种等位基因交配模式的主基因遗传模型、极大似然法估计遗传效应参数和最佳遗传模型筛选等步骤,分析了大豆四向杂交组合(垦丰14×垦丰15)×(黑农48×垦丰19)重组自交系群体株高与主茎节数的主基因遗传模式和遗传效应。结果表明:在试验的遗传群体中,株高受2对主基因控制,2对主基因间没有上位效应,其遗传模式分别为A1A2×A3A4和B1B2×B1B3,第一主基因的加性效应分别为-4.9、6.22和20.33,第二主基因的加性效应分别为-9.39和26.23,主基因遗传率为97%。主茎节数受1对主基因控制,遗传模式为A1A2×A1A3,加性效应分别为16.82、-1.32和2.64,成分分布方差为11.51,主基因方差为3.05,主基因遗传率为21%。

In order to predict the existence of major gene that control plant height and main stem nodes in a four-way recombinant inbred lines population（ Kenfeng 14 ×Kenfeng 15 ） ×（Heinong 48 ×Kenfeng 19 ）, three steps of constructing various model according to mating mode of multiple allels, estimating genetic effects by maximum likelihood method, selecting the best model, the genetic mode and genetic effects were analyzed. The result showed plant height was controlled by two major genes without interaction and inheridity mode,which were AI A2 x A3 a4 and B1 B2 × B1 B3, respectively. The additive effects of the first major gene were - 4.9,6.22,20.33 and that of the second major gene were - 9.39,26.23, and the heredity of the major genes was 97%. Main stem nodes was controlled by one major gene and inheridity mode was A1A2 × A1 A3. The additive effects of the major gene were 16.82, - 1.32,2.64 ,and the heredity was 21%. The result indicated it was feasible to carry out QTL mapping on plant height and main stem nodes through four-way recombinant inbred lines population（ Kenfeng 14 ×Kenfeng 15） ×（ Heinong 48 x Kenfeng 19）.