Genetic analysis of resistance to 4E0A+ race of stripe rust in bread wheat

to study the inheritance of stripe rust resistance and to estimate the genetic components of resistance in wheat, F1, F2, BC1 and BC2 generations derived from crosses between two resistant cultivars and one susceptible cultivar (Bolani) along with parental lines were evaluated in a randomized complete block design (RCBD) with three replications in greenhouse. The plant materials were inoculated with pathotype 4E0A+ of stripe rust. In all plants, resistance components including latent period and infection type were recorded after appearance of pustules on leaves. Generation mean analysis revealed that additive, dominance and epistasis play major roles in increasing and decreasing of latent period and infection type, respectively. In spite of significant additive effect, dominance effect was more important in controlling these two characteristics. Broad sense heritability and narrow sense heritability estimates for latent period was 0.33 and 0.28 and for infection type was 0.42 and 0.39 respectively