东南沿海地区大麦白粉菌群体毒性分析

Virulence analysis of barley powdery mildew (Blumeria graminis f.sp.hordei) in four southeast coastal areas of China

利用19个含有已知抗大麦白粉病基因的鉴别寄主,对采自福建莆田、江苏盐城、浙江海盐和杭州4个地区的213个大麦白粉病菌株,进行毒性基因鉴定和毒性频率分析。结果显示,在被调查的白粉菌群体中,尽管某些毒性基因的频率在不同地区有所不同,但大部分亚群体中毒性基因的频率在不同地区极为接近;在东南沿海4个地区大麦抗白粉病育种中,具有利用价值的抗病基因是:Mla11,Mlmw,Mlkb,Mlmlw,Mlk2,(Mla10MlDu2)和(MlKl Mla8),无利用价值的抗病基因是:Mla8,Mlnn,Mlh,(Mlra Mla8),(MlRu2Mla8),(MlBw Mla8),(MlraMlDr2)和(MlLa Mla8)。

Nineteen differential lines possessing known barley powdery mildew （Blumeria graminis f. sp. hordei） resistant genes were used in virulence analysis for the population consisted of 213 isolates collected from four areas along the southeast coastal region of China. Most of virulent genes investigated in this study showed very similar virulence frequencies in the four different areas. Among these known resistant genes, Mlal 1, Mlmw, Mlkb, Mlmlw, Mlk2, （Mlal0.MlDu2） and （MIK1 MlaS） were found as ones effective for powdery mildew resistance breeding in all the four areas, while MlaS , Mlnn, Mlh, （ Mlra MlaS ） , （ MlRu2 MlaS ） , （ MlBw MlaS ） , （ Mlra MlDr2） and （ MlLa Mla8 ） as ineffective ones.