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

doi:10.7668/hbnxb.2008.01.043

Abstract

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

CLC Number:

S435.12

LIU Jian-xia, HE Run-li, CHANG Zhi-jian, ZHAN Hai-xian, ZHANG Xiao-jun, DONG Chun-lin, WANG Chuang-yun. Genetic Study of Resistance to Powdery Mildew in a Thinopyrum intermedium -derived Wheat Breeding Line CH5026[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2008, 23(1): 194-198. doi: 10.7668/hbnxb.2008.01.043.

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