小麦梭条花叶病抗性遗传分析

Heritability of Resistance to Wheat Spindle Streak Mosaic Virus

为给抗小麦梭条花叶病育种提供参考依据，应用植物数量性状主基因＋多基因混合遗传模型对冬小麦品种C112633（抗病亲本）与扬麦158（感病亲本）杂交组合的RIL群体进行了小麦梭条花叶病的抗性遗传分析。结果表明，C112633×扬麦158的小麦梭条花叶病抗性受3对主基因＋多基因控制（G2模型），主基因遗传率为91％，多基因效应很小，其遗传率几乎为零。因此小麦梭条花叶病抗性主要为主基因遗传，但3对主基因的基因效应不等，第1对主基因的基因效应分别为3．38和4．49；第2对主基因的两个重复基因效应分别为8．23和7．41；第3对主基因的两个重复基因效应分别为14．12和13．63，是第1对主基因效应的3～4倍。

Wheat spindle streak mosaic （WSSM）, a fungal transmitted soil born virus disease, has spread rapidly and become one of the most serious diseases in wheat production. Developing resistant varieties is an efficient solution to control this disease. Unfortunately, the inheritance of resistance to WSSM is still poorly understood. This study was conducted to elucidate the inheritance of resistance to WSSM in a population of F8 derived recombinant inbred lines （RILs） from a cross of CI12633 （ resistant） × Yangmai 158 （susceptible） by using the major gene plus polygene mixed inheritance model. The results indicated that the inheritance of resistance to wheat spindle streak mosaic in the RILs was controlled by three major genes plus polygene （Model G-2）. These three major genes showed different additive effects. The effects of the first one was 3. 38 （replication 1） or 4. 49（replication 2）, the effects of the second was 7.41 （replication 1） or 8.23（replication 2）, and the effects of the third was 13.63（replication 1） or 14.12 （replication 2）. The additive effect of the third gene was about 2-3 times of that of the first gene. The heritability of the major genes was about 91 %. Polygene effect was very low. So the inheritance of resistance to wheat spindle streak mosaic in the RILs was controlled by 3 maior genes.