【摘要】 1987—1989年间,自四川收集的85个小麦白粉菌株接种在11个已知抗白粉病单基因小麦品种及近等基因系上。试验结果表明:v1,v3b,v3c,v5毒性基因频率很高,达90%以上,次为v3a,v7,v8(88.2—65.9%),v2,v6分别为42.4%和37.6%,v4a,v4b频率最低(15%以下),毒性基因组合中,以v2+v6,v2+v4a,v2+v4b,V4b+v6,v4a+v8的出现极少,表示含有相对应抗性基因组合的品种是高度抗病的。供试的四川小麦白粉菌株,多数均具有7—8个已知毒性基因,毒谱较广。这给该地区小麦抗白粉病育种工作增加了难度。更多还原

【Abstract】 Eight-five isolates of Erysiphe graminis f.sp.tritici collected from mild-ewed wheat leaves in Sichuan province during 1987—1989 were inoculated on11 wheat cultivars and isolines with known powdery mildew resistancemonogenes.The virulence gene frequencies of vl,v3b,v3c and v5 appearedvery high (more than 90%),followed by v3a,v7 and v8 (88.2—65.9%),thevirulence gene frequencies of v2 and v6 were 42.4% and 37.6% respectively,and those of v4a and v4b were low (less than 15%).Virulence gene combi-nations,such as v2+v6,v2+v4b,v2+v4a,v4b+v6,and v4a+v8 wererare,suggesting that cultivars with corresponding resistance gene combina-tions will be highly resistant.Most isolates tested seemed to have seven oreight known virulence genes and exhibited broad virulence spectrum.There-fore,breeding for resistance to powdery mildew in wheat in Sichuan provinceis more difficult than expected.更多还原