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A half diallel cross was made among four resistant varieties including M-73-7, M-73-4, M-73-3, M-73-6, and a susceptible variety Bolani. Parents and F1 progenies were tested at seedling stage in the glasshouse with the race 226E222A+. Four characters including infection type, Latent period, pustule size, pustule density were measured on the seedling stage (first leaf). Two procedures including Griffing and , Jinks and Hayman were Used to analyze the data. Results indicated that additive - dominance model can be appropriate for all characters. Results further showed that seedling resistauce is controled by recessive genes and parent M-73-4 had the most recessive alleles. For rest of the parents, frequency of dominant alleles were more than that of recesive alleles. Broad- sense heritabilities estimates ranged from 69 to 90%, with latent period having the highest estimate