واكنش هفت رقم گندم به پاتوتيپ ال 1 قارچ Tilletia laevis عامل سياهك پنهان معمولي

Reaction of seven wheat cultivars to pathotype LI of Tilletla laevis fungus causal of common bunt

Common bunt, caused by Tilletia laevis Kiihn, is an important wheat disease in Iran. As epidemic distribution of pathotype LI this fungus determined in Khorasan provinces, reaction of 7 Iranian cultivars: Pishtaz, Alvand, Azar2, Zagros, Tajan, Rushanʹs back-cross and Gaskojen, under cultivation in Khorasan and Golestan, provinces evaluated in greenhouse, after inoculation their seeds with telliospores of this fungus pathotype in 8 replications for each treatment in complete randomized design estimated under greenhouse condition. After ripening reaction estimate base on percentage of contaminated kernels of each cultivars determines, and means compared with Duncanʹs test. Results showed that Pishtaz, without contamination is resistant, and the others are sensitive to this pathotype. Progress of infection during stages 1,2 & 3 of seedling also studied with staining of their tissues, and fungal hyphen observed in Pishtaz tissues in first growth stages, but in the others was obvious after that, therefore with this method reaction of cultivars can identified quicker. These results report for the first time, Agronomical characters of these cultivars and effective resistant genes for their breeding program illustrated and discussed.