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。

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

Abstract: CH5026, a wheat breeding line developed by backcrossing a partial whea- t Thinopyrum intermedium am -phiploid 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 similarto its donor TAI7045 and Th. intermedium,whereasthe wheat parents of both CH5026 and TAI7045were susceptible, in -dicating that the PM -resistance gene in CH5026 derived from Th. intermedium, the grass parent of TAI7045.To invest- igate the inheritance mode of its PM -resistance, CH5026 was crossed with the susceptible(S)cv. Jintai 170 and lineCH5065. Parents andthe resulted F1 plants, F2and BC1 populations, and F2 -derived F3(F2?3)lineswere tested with mixedpowdery mildew races, including Egt isolate E09, in the greenhouse.The F2populations from two crosses segregated in aratio of 3R?1S, and the BC1 population from a backcross of CH5026(R)/Jintai170(S)?Jintail170(S)in a ratio of 1R?1S.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, F2and BC1generations, andthe F3lines, the PM resistance in CH5026was conferred by a single dominant gene.

Key words: Wheat, Thinopyrum intermedium, Whea- t Thinopyrum partial amphiploid, Powdery mildew, Resistance inheritance

中图分类号: 

• S435.12