中国小麦秆锈菌鉴别寄主品种免字52抗秆锈病基因的单体分析  

MONOSOMIC ANALYSIS OF THE STEM RUST RESISTANT GENES IN COMMON WHEAT VARIETY MIANZI 52 A CHINESE DIFFERENTIAL HOST FOR PUCCINIA GRAMINIS f. sp.TRITICI

作　　者：张书绅[1] 杨涛[1] 周灶建 

机构地区：[1]沈阳农业大学

出　　处：《中国农业科学》1994年第6期28-32,共5页Scientia Agricultura Sinica

基　　金：国家自然科学基金

摘　　要：普通小麦品种免字５２是我国小麦秆锈菌的鉴别寄主品种。用中国春单体系列和秆锈菌生理小种３４的单孢菌系对免字５２进行了抗秆锈病基因的单体分析。并将免字５２所含有的抗秆锈病基因与国际上已命名的Ｓｒ１７基因进行了异同比较。结果表明：免字５２在７Ｂ染色体上含有隐性抗病基因Ｓｒ１７。该基因为主动隐性，存在剂量效应，在纯合状态下控制；－；１的侵染型，在半合或杂合状态下不起抗病作用。免字５２在５Ａ染色体上存在另一个被动隐性抗病基因，暂定名为ＳｒＭＺ。该基因在纯合或半合状态下提供３ｃ－Ｘ的侵染型，在杂合状态下不起抗病作用。ＳｒＭｚ是与国际上已定位在染色体上的抗秆锈病基因不同的基因。免字５２中的Ｓｒ１７、ＳｒＭｚ和可能还有一些微效基因的共同作用，使免字５２对生理小种３４呈现免疫的侵染型。正是由于Ｓｒ１７的作用，才使免字５２对我国的小麦秆锈菌２１类群和３４类群有进一步的区分作用。The common wheat variety Mianzi 52 is a supplemental differential host of Puccinia graminis f.sp.tritici in China. Monosomic analysis of the resistant genes in Mianzi 52 to stem Rust race 34 was carried out.The results showed that Mianzi 52 carried two independent recessive genes. One was an active recessive gene Sr17 located on chromosome 7B,while the other was a passive recessive gene on chromosome 5A,temporarily designated as SrMz .The gene Sr17 possessed dosage effect.The homozygote of gene Sr17 controls IT;-;1,while the merozygote or heterozygote does not have resistant efect. The homozygote or merozygote of gene SrMz controls IT 3￣c-X,but heterozygote does not have resistant effect. Gene Sr17,SrMz and probably some minor genes carried by Mianzi 52 are combined to control IT“0”of Mianzi 52. It is due to gene Sr17 that Mianzi 52 has further differentiating ability for the populations of Race 21 and Race 34 in China.

关 键 词：小麦 秆锈病 鉴别寄主 单体分析 Sr基因 

分 类 号：S435.121.4[农业科学—农业昆虫与害虫防治]