Stripe rust of wheat as considered one of the most important diseases in the vast
majority of the world area grown to wheat. In Egypt the first record of epiplytoUc due to such disease was that of 1967 which
attacked the local wheat var. Giza 144. On the other hand the last epiplytotic was that
of 1995 which affected most of the cultivated vars. and inducing high losses. The present work aimed to increase the levels of stripe rust resistance by the
incorporation of Yr5 (Triticum sp < /em>ilta album) via crossing with our susceptible cultivars
viz. Sakha 8, Sids 4,- 5,-6 at Sakha Agric.Res.Stn. The obtain of results F, plants exhibited high levels of resistance when infected
by race E at both seedling and adult stages. This result indicated that resistance is
dominant over susceptibility. The F2 segregation's (3 resistant: 1 susceptible) indicated that resistance in the
tested material is govemed by two gene pairs .The third result indicated that the
phenotype was not affected by the factor (Yr5).This result reflected the significance of
exploiting this factor in the breeding program. The increasing values or heritability in broad sense in F, and F2 in most crosses
confirmed the importance of the additive dominant action consequently, it will be easy
to performs the selection at ~asily generations. But ,it is better to make selection at
iate generations because of its importance and befitial for breeding programs.