甘肃中西部春小麦白粉菌群体毒性分析

利用小麦苗期离体培养 ,对甘肃中西部地区的小麦白粉病菌进行生理小种鉴定及群体毒性频率分析 ,结果 :( 1 )纯化菌株 36份 ,鉴定出生理小种 2 0个。其中优势小种是 0 1 5 ,分布频率为 1 6.7% ,0 77号为次优势小种。( 2 )群体毒性频率分析中毒性基因 VEra,V8,V1 ,V3c,V3f频率达 70 %以上 ,而 V2 ,MID,V2 0 ,V2 1 ,V4b,V4频率在 1 6.7%以下 ,46%的白粉菌毒性基因频率高于 40 % ,说明目前甘肃省白粉菌毒性基因频率高 ,含有Pm2 MID,Pm2 0 ,Pm2 1 ,Pm1 b,Pm1 等抗病基因的品种在育种中有一定的利用价值

Croup Virulence Study of Blumeria Graminis f. sp Tritici in the Middle West of Gansu Province

In 2003, Physiologic race and group virulence of Blumeria graminis f.sp tritici in the mid-west of Gansu Province were tested on detached wheat leaves. Results:(1) 36 isolates of Blumeria graminis f.sp tritici were collected and 20 physiologic race were obtained , 015 was dominant race with frequency of 16.7% while 077 was subdominant race. (2) Isolates V_(Era),V_8,V_1,V_(3c),V_(3f) showed the highest virulence frequency above 70%, while V_(2,MID),V_(20),V_(21),V_(4b), V_4 below 16.7%. It indicated Blumeria graminis f. sp tritici from mid-west of Gansu province has a high gene virulence frequency and Pm_(2 MID),Pm_(20),Pm_(21),Pm_(1b),Pm_1 provided applicable value in breeding.