摘要
１９９１年我国小麦秆锈除四川、河南省局部流行外，其它地区发生较轻，本年度标样来自全国１５个省、市、自治区的４１个县，涉及到９４个小麦品种。经分离，鉴定了菌株１９７份，其中小种２１Ｃ３出现频事为８５．３％，３４为８．７％，３４Ｃ２为４．５％，３４Ｃ１为１．５％；致病类型２１Ｃ３－ＣＫＨ出现频率为５７．４％居首位，其次为２１Ｃ３—ＣＫＲ，为２３．４％。在利用１９７个菌株对４１个Ｓｒ单基因系的毒力频率测定中，没有发现对Ｓｒ９ｃ，１１和２１有毒力对菌株；对Ｓｒ２５，２６，３０，３１，３５和３８的毒力频率均在２％－６％之间，结果与１９９０年相似。
Wheat stem rust occurred in a negligible amount cationwide in 1991 except for the local moderate epidemics in parts of SICHUAN & HENAN provinces. By isolating and identifying all rusted whcat collcctions from 94 cultivars distributed over 41 counties in 15 provinces and autonomous regions, the most common pathotype was 21C3-CKH (57.4%)and the next to it was 21C3-CKR(23.4%). Other races(34C2, 34, and 34C1)were very low in percentage. In addition, by using 41 Sr near--isogenic lines, virulence frequency was determined, The result indicated that none of the 194 cultures was virulent to Sr 9e, 11 and 21, and the virulence frepuencies to Sr 25, 26, 30, 35,and 38 ranged from 2 to 6%.
出处
《沈阳农业大学学报》
CAS
CSCD
1994年第2期172-176,共5页
Journal of Shenyang Agricultural University
关键词
小麦
秆锈病
生理小种
致病类型
wheat stem rust
physologic race
pathotype
virulence frequency
