Responses of some Doubled Haploid Lines of Bread Wheat

Responses of 189 doubled haploid lines, produced by chromosome elimination method crosses between wheat and maize, were evaluated for yellow rust in Karaj, Gharakhil and Gorgan, and for fusarium head blight in Sari and Gorgan. Yellow rust nursey was inoculated four times and fusarium nursery three times with urediniospores of Pucinia striiformis and macroconidia suspension of Fusarium graminearum in anthesis stage. Data on yellow rust was recorded at flag leaves expended stage for three tims and for fusarium head blight one month after inoculation. For evaluation of resistance to yellow rust at seedling stage the reaction of doubled haploid lines and their parents was also evaluated. The results showed that among 189 doubled haploid lines, 40 lines were resistant in all stations and the others were susceptible, moderately resistant or moderately susceptible to yellow rust. In Sari, 23% of lines and in Gorgan 29% were tolerant to fusarium head blight. Doubeld haploids no. 10, 13, 14, 26, 36 and 37 were resistant to yellow rust and showed acceptable level of tolerance to fusarium head blight diseases both in Gorgan and Gharakhil. Some characters of doubled haploid lines such as days to heading, plant height, cold tolerance and 1000 kernel weight were evaluated. Finally, based on the results, the doubled haploid lines were classified in different groups. Due to high variability in their resistance to diseases and agronomic characteristics, some of them were selected for using in breeding programs.