الفهرس 
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Abstract
To evaluate the resistance of some barley genotypes for net blotch disease as well as grain yield and its related traits, twenty genotypes (12 local varieties and 8 exotic lines) of barley were used. Expression of severity to foliar infection varied between the evaluated genotypes, Giza 117 and Giza 2000 appeared the highest infection response, Giza 123, Giza 124, Giza 126 and Giza 131 were moderately susceptible, while the other genotypes ranged between resistant to moderately resistant. Line 81 and Line 91 proved to be the most resistant genotypes for net blotch. Moreover, Giza 133 and line 91 showed superiority in grain yield values over all the tested barley genotypes and high resistance reaction for net blotch disease. The genetic variations and relationships among the used genotypes were evaluated using random amplified polymorphic DNA (RAPD), start codon targeted polymorphism (SCoT) and simple sequence repeats (SSRs). A high level of polymorphism was found with the three types of DNA markers and the mean polymorphic information content (PIC) values were 0.23, 0.25 and 0.25 for RAPD, SCoT and SSR markers, respectively.