源于中间偃麦草的小麦新品系CH5026白粉病抗性的遗传  

Genetic Study of Resistance to Powdery Mildew in a Thinopyrum intermedium-derived Wheat Breeding Line CH5026

作　　者：刘建霞[1] 贺润丽[1] 畅志坚[2] 詹海仙[1] 张晓军[2] 董春林[2] 王创云[2] 

机构地区：[1]山西大学,山西太原030006 [2]山西省农业科学院作物遗传研究所,山西太原030031

出　　处：《华北农学报》2008年第1期194-198,共5页Acta Agriculturae Boreali-Sinica

基　　金：国家自然科学基金项目(30671299);山西省自然科学基金项目(2006011093)

摘　　要：CH5026是衍生于八倍体小偃麦TAI7045的抗病新品系,它兼抗小麦的白粉病和条锈病。温室抗性评价结果显示,无论是苗期还是成株期,CH5026对白粉病菌系E09均表现为免疫,且具有与其抗性供体TAI7045及TAI7045的野生亲本中间偃麦草相似的白粉病抗性,且CH5026和TAI7045的小麦亲本均为中、高感,表明存在于CH5026的白粉病抗性来自中间偃麦草。为进一步明确其白粉病抗性的遗传规律,用高感品种(系)晋太170和CH5065分别与CH5026杂交、回交,将其F1,F2,BC1,F3群体及其双亲分别在太原温室用白粉病15号小种的E09菌系接种,并按单株调查其抗感分离之比。结果表明,F1对白粉病的感染分别为0或0;级。F2,BC1的群体中,其抗感分离分别符合3R∶1S和1R∶1S;而且在F3株系中,全抗∶抗感分离∶全感为1∶2∶1,说明衍生于TAI7045的抗病品系CH5026对白粉病的抗性受1对显性核基因控制。CH5026,a wheat breeding line developed by backcrossing a partial wheat-Thinopyrum intermedium amphiploid TAI7045 with susceptible wheat cultivar,exhibits the resistance to both powdery mildew （PM） and yellow rust. Greenhouse evaluation of resistance reactions at seedling and adult stage showed that CH5026 had PM-resistance similar to its donor TAI7045 and Th. intermedium, whereas the wheat parents of both CH5026 and TAI7045 were susceptible, indicating that the PM-resistance gene in CH5026 derived from Th. intermedium, the grass parent of TAI7045. To investigate the inheritance mode of its PM-resistance, CH5026 was crossed with the susceptible （S） cv. Jintai 170 and line CH5065. Parents and the resulted F1 plants, F2 and BCI populations, and F2-derived F3 （F2：3） lines were tested with mixed powdery mildew races, including Egt isolate E09, in the greenhouse,. The 172 populations from two crosses segregated in a ratio of 3 R ： 1 S, and the BC1 population from a backcross of CH5026 （R）/Jintai 170 （S）//Jintail 170 （S） in a ratio of 1R ： IS.The F2：3 lines from CH5026（R） CH5065 （S） exhibited a segregation pattern of 1 （all R） ：2 segregating： 1 （all S）. According to disease ratings of parents, and the F1, F2 and BC1 generations, and the F3 lines, the PM resistance in CH5026 was conferred by a single dominant gene.

关 键 词：普通小麦 中间偃麦草 八倍体小偃麦 白粉病 抗性遗传 

分 类 号：S435.12[农业科学—农业昆虫与害虫防治]