玉米乳熟期茎秆木质素含量的遗传分析

Genetic Analysis of Lignin Content in Maize Stalk at Milk Stage

以WBA31×K4138构建的DH群体及其亲本为试验材料,采用P1、P2与DH群体3世代主基因+多基因联合分离分析模型,对玉米乳熟期茎秆木质素含量进行遗传分析,探讨玉米茎秆木质素含量的遗传基础。结果表明,玉米茎秆木质素含量遗传符合3对加性-上位性主基因+多基因模型遗传,主基因遗传率为44.91%,多基因遗传率为43.94%,多基因效应比较明显,主基因总加性效应小于主基因间互作效应。因此,在育种时既要注重基因间的加性效应,又要考虑基因间的互作,同时要加强微效多基因的效应累加。

In order to understand the genetic model and regularities of lignin contents in maize stalk, a double haploid（DH） population derived from WBA31 and K4138 was used as the materials. The genetic regularities of lig- nin content in maize stalk were analyzed by applying the major gene plus polygene model of quantitative traits to joint segregation analysis. The results showed that lignin content in maize stalk was controlled by three major genes with additive-epistasis and polygene effects. The heritability for major gene was 44.91% and polygene was 43.94%. Lignin content in maize stalk had significant polygene effect. Total effect value of additive was less than the value of interaction. The additive effect, interactive effect and polygene effect needs to be paid great attention in maize lignin content breeding.