小麦抗源材料0911-3抗白粉病的主基因+多基因遗传分析

摘要

为了解小麦抗源材料0911-3对白粉病的抗性遗传规律,以0911-3为母本与极度感病品系1130-2杂交,产生P1、P2、F1、BC1、BC2和F2共6个家系世代,分别以倒二叶病害严重度(MDS)和病程曲线下叶面积(AUDPC)为成株抗性指标,应用主基因+多基因混合遗传模型多世代联合分析方法进行遗传分析.结果表明,0911-3对白粉病的2种成株抗性指标的遗传基础基本是一致的,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对主基因都具有负向加性效应,可以增强抗病性,显性效应为正向,感病基因具有部分显性作用；2对主基因间还存在各种相互作用,可以增强抗病性；分离世代以F2主基因+多基因遗传率为最高,MDS和AUDPC的遗传率分别为91.87％和92.22％.%In order to realize the inheritance law of powdery mildew resistance in wheat 0911-3 ,six populations ( P1,P2,F1, BC1, BC2 and F2) derived from the cross of 0911 -3× 1130-2 were used to study the inheritance of powdery mildew resistance by the mixed major-gene plus polygene inheritance model with joint analysis method of multiple generations with using maximum disease severity ( MDS) and area under the disease progress curve( AUDPC) as adult plant resistance index. The result suggested that the inheritance of powdery mildew resistance of wheat 0911-3 of two adult plant resistance index was consistent, all fitted two pairs of additive-dominance-epitasis majorgenes plus additive-dominance-epitasis polygene model ( E model) ; Two major genes was negative additive effects, which can enhance resistance, the dominance effect was positive, infected gene was partial dominance effect; There were variety of effects between two major genes, which can enhance resistance; The major gene plus poly-genes heritability of the F2 was the highest in segregative generation, the heritability of MDS and AUDPC were 91. 87% and 92.22% .