ارزيابي مقاومت لاين هاي اميدبخش گندم اقليم سرد (c-81 ) نسبت به بيماري زنگ زرد در اردبيل

Resistance evaluation of elite wheat lines of cold area (C-81) to yellow rust in Ardabil

In this research, 15 Elite wheat lines of cold area were evaluated to yellow rust in Ardabil in order to determine their resistance level. Each genotype was planted in two 1 m long rows spacing 30 cm apart and under mist irrigation with artificial inoculation. The experiment was conducted in 2002 -2004 cropping years, based on complete block design with three replications. To increase disease development, a susceptible cu1tivar (Bolam) was sowed among lines (5 entry intervals) and also as borders of nursery. Besides, artificial inoculation of the nursery was carried out using a mixture of spores and talcum powder at sun set and Os36 stage by means of a duster. The disease severity and infection type were recorded respectively based on the modified Cobbʹs scale and Roelfs et al. Method. Then, coefficients of infection (CI) were calculated by combination of disease severity and infection type. Results of simple and combined variance analysis showed significant differences among lines and line x year at %1 probability level. Mean comparison of Cl for two years (separately and combined) and of rAUDPC (relative Area Under Disease Progress Curve) for 2004 indicated that the lines; C-8l-15 (check) and C-8l-2 had the highest CI and rAUDPC. The lines C-81-1 and C-81-12 had the moderate level ofCI and rAUDPC, therefore they were selected as moderately susceptible lines. The rest of lines had not any infection or were at low level of infection. Thus. they were selected as resistant or moderately resistant lines.