摘要
毕节地区小麦白粉病菌生理小种至少由１、５、７、１５、１１５、３１１、３１３、３１５、３４７、３７７、７１５等１１个生理小种组成，其中３１５号为优势种，其生理小种的毒性及组成复杂性不亚于全国小麦白粉病鉴定中心兴义，但县与县之间差异较大。历时４年从２５００份国内外的原始材料中共鉴定出３５份在田间和室内诱发接种条件下表现高抗—免疫的抗源材料，其中贵农１９、贵农２１等１８个已知、未知抗性基因抗源材料的毒性频率极低，是不可多得的抗源材料。含Ｐｍ８、ｐｍ４＋ｐｍ８、ｐｍ２Ｘ已知抗性基因的抗源材料抗性在全区已基本丧失，毒性频率超过５０％；目前毕节地区大面积生产的主栽品种其毒性频率也在４０％以上。
The physiological races of wheat powdery mildew were mainly constituted of race 1,5,15,115,311,313,315,347,377,715,etc,in which race 315 was the predominant one in Bijie Prefecture The toxicity and constitution of these races were complex, even more complex than that in Xingyi Prefecture where The Identification Centre of Wheat Powdery Mildew of China is set up;but that varied between counties 35 resistant materials showeing high resistance to immumity in field and laboratory under the condition of inoculation were screened out fron 2500 original materials collected from domestic and abroad during past 4 years Among them,18 materials with known and unknown resistant genes including Guinong 19,Guinong21, ect ., had very low toxinity frequency ,and were very important resistant resources. The resistance of some resistant materials with pm8,pm4+pm8 ,pm2x genes almost lost ,their virulent frequency even higher than 50% The toxicity frequency of staple cultivars in Bijie Prefecture was higher than 40%
出处
《西南农业学报》
CSCD
北大核心
1998年第1期85-89,共5页
Southwest China Journal of Agricultural Sciences
关键词
生理小种
毒性频率
小麦
白粉病
抗性鉴定
Toxicity frepuency E·granimis f·sp· tritici Resistant resources Physiological race
