Evaluation of slow rusting resistance components in some promising wheat lines of moderate Climate zones to yellow rust in field conditions in Ardebil

Twenty promising wheat lines together with tow susceptible control cultivars Bolani and Morocco were evaluated for slow rusting resistance in Ardebil during 2013-2014 cropping season. Different components of slow rusting including coefficient of infection (CI), final rust severity (FRS), relative area under diseas progress curve (rAUDPC) and apparent infection rate(r) were assessed at both seedling and adult plant stages under filed condition. Pustule size and pustule density were also measured at both grow stages. The results showed that lines  M-91-17 and  M-91-4 were susceptible or moderately susceptible at seedling stage but resistant or immune at adult plant stage which indicates the presence of adult plant resistance in these lines. Lines  M-91-18, M-91-20, M-91-5, M-91-6 and M-91-7 were moderately resistant at seedling stage but showed favorable levels of slow rusting at adult plant stage. Lines  M-91-13, M-91-14,  M-91-12 and M-91-8 which were susceptible at seedling stage and showed higher levels of slow rusting at adult plant steges, seems to pocess some adult plant recsistant genes. Susceptible control cultivars  had the highest r, CI, FRS, rAUDPC, pustule density and pustule size. Based on the values of the measured traits, except M-91-2,  M-91-3, M-91-9, M-91-10, M-91-11,  M-91-15 and M-91-16, the remaining lines had medium to high levels of slow rusting resistance. Correlation cofficients between FRS and CI, rAUDPC and r were 98%, 97% and 97%, respectiveiy.