小偃麦渐渗系对白粉病和条锈病抗性的遗传分析  

Inheritances of Resistance to Powdery Mildew and Stripe Rust in Cryptic Alien Introgression from Thinopyrum intermedium

作　　者：詹海仙[1,2] 李光蓉[2] 张晓军[1] 李欣[1] 畅志坚[1] 

机构地区：[1]山西省农业科学院作物科学研究所,山西太原030032 [2]电子科技大学生命科学与技术学院,四川成都610054

出　　处：《华北农学报》2012年第5期163-167,共5页Acta Agriculturae Boreali-Sinica

基　　金：山西省青年基金项目(2010021026-1)

摘　　要：CH5382是一个携带中间偃麦草抗性基因的隐形异源渐渗系,它兼抗白粉病和条锈病。为明确其抗性的遗传规律,用高感品种绵阳11、台长29和SY95-71杂交,将其F1、F2、F3家系及其亲本分别在太原温室(用白粉病E09菌系接种)和四川成都电子科技大学农场(用条锈病菌CYR32接种)进行了抗性基因的遗传分析。结果表明,F1对2种病害的抗性分别为免疫(0级),近免疫(0;级);F2分离群体中,白粉病抗感分离比例符合3R∶1S;条锈病的抗感分离比例也符合3R∶1S;F3家系的抗感分离比例均符合1R∶2Seg∶1S的理论比例。说明小偃麦渐渗系CH5382对白粉病和条锈病的抗性均受1对显性基因控制。CH5382 is a stable cryptic alien introgression carrying resistance genes of Thinopyrum intermedium.It was highly resistant to both powdery mildew and stripe rust disease.To determine the resistance inheritances in it,CH5382 was crossed with three susceptible cultivars（line）.The adult tests of F1,F2 and F3 progenies from these crosses and their parents were inoculated with Egt isolate E09 in Taiyuan greenhouse and with mixed Pst isolates including CYR32 at Sichuan disease nursery,respectively.It was consistent to both powdery mildew（IT 0） and stripe rust（IT 0;） for F1 plants and their resistant parent CH5382,indicating complete dominance of the two resistances in these crosses.Powdery mildew resistant and susceptible segregation ratios satisfactorily fit 3R ∶ 1S in the F2 populations and segregation ratios for stripe rust reaction of F2 progenies from these crosses suit 3R ∶ 1S.The F2：3 lines displayed a segregation ratio of 1（all R） ∶ 2 segregating ∶ 1（all S）,demonstrating that the powdery mildew resistance and stripe rust resistance in CH5382 were conferred by a single dominant gene separately.

关 键 词：小麦 中间偃麦草 白粉病 条锈病 遗传分析 

分 类 号：S512.103[农业科学—作物学]