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Abstract

Four crosses were made amongst the susceptible Tiritea and the adult plant resistant genotypes PB-081. PB-137, BB - 184 and PB - 241 to obtain
F1,F2 and backcrosses. Parental, F1,F2 and backcross populations were evaluated in the field for rust severity, inoculated with pathotype 134E102 A¬of stripe rust. At three different dates, rust severity was recorded for individual plants at ten day intervals, starting from growth stage 40 (zadok's scale) or before boot swollen. The area under the disease progress curve (AUDPC) was calculated and a weighted analysis was used for the generation mean analysis. Resistance in the four adult plant resistant genotypes, in cross with susceptible cultivar, was dominant. The joint scaling test indicated that the inheritance of stripe rust resistance was described by the additive-dominance components and epistasis. mainly additive x additive. Heritability ranged from moderate to high and number of segregating genes governing resistance ranged from 3 to 6 for four genotypes mentioned aboved.

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