东北春麦区2006-2007年小麦白粉病菌群体毒性监测

对2006-2007年采自黑龙江、吉林、辽宁的80份小麦白粉病菌标样进行分离、纯化得到113个单孢子堆菌系,经生理小种及群体毒性频率测定,共鉴定出29个生理小种,优势小种均为15号小种。15号小种在2006年和2007年的频率分别为15.3%和14.8%,其次为415号和11号小种。小麦白粉菌毒性基因v1、v3 a、v3 b、v3 c、v5、v6、v7、v8、v1+2+9和v17毒力频率较高(>66%),而v2、v4、v12、v16和v21毒力频率较低(<21%),说明目前在东北春麦区含有Pm2、Pm4、Pm12、Pm16和Pm21等抗病基因的品种在育种中有较高的利用价值。

Monitoring of population virulence of Blumeria graminis f.sp tritici in spring wheat-planting regions of northeastern China during 2006-2007

Physiological races and virulence structures of B.graminis were tested with 80 powdery mildewed samples that were obtained from Heilongjiang,Jilin and Liaoning Provinces during 2006-2007.As a result,113 souses of B.graminis were isolated and identified,and 29 physiological races were identified,among which No.15 was the dominant race,with its frequency as 15.3% in 2006 and 14.8% in 2007,respectively,followed by No.415 and 11.The virulence frequencies of v1,v3a,v3b,v3c,v5,v6,v7,v8,v1+2+9 and v17 were high(>66%),but those of v2,v4,v12,v16 and v21 were low(<21%).It is therefore suggested that all of the current cultivars with one or more of the resistant genes Pm2,Pm4,Pm12,Pm16,Pm21 might be valuable for resistance breeding.