graminis DC at early stage. The material used in the study was an BC5F4 line of ?Bainong 3217 X Mardi er (powdery mildew resistant)? with Bainong 327 as the recurrent parent.

• 实验所用材料为本实验室培育的抗白粉病品系“百农3217×Mardler”BC_5F_4；