Reaction of Irrigated Wheat Commercial Cultivars and Candidate Lines of Iran to Bacterial Leaf Streak Disease

Bacterial leaf streak of wheat caused by Xanthomonas translucens pv. undulosa is one of the most important diseases of wheat which has threatened wheat production in some regions in Iran in recent years. Considering the importance of the disease in the country and lack of information about reaction of wheat cultivars and candidate lines of Iran to the disease, the reaction of 113 wheat commercial cultivars and candidate lines from the national irrigated wheat breeding programs of Iran were evaluated under high natural disease pressure at agricultural research station of Boroujerd, Lorestan, Iran, in 2017-18 cropping cycle. The results showed that all wheat commercial cultivars and candidate lines were susceptible to the disease with scores varied from 71 to 99 based on a 00-99 scale. Ten commercial cultivars including Parsi, Setareh, Meraj, Kalateh, Tirgan, Ehsan, Gonbad, Morvarid, Darya, and Narin, and six candidate lines including M-93-11, S-94-7, S-94-12, S-94-22, N-94-8, and MS-93-3 were rated highly susceptible with scores from 94 to 99. The present study, which is the latest and most recent evaluation on the reaction of wheat to bacterial leaf streak in Iran, may open a window for further research and development of resistan wheat cultivars to the disease.