This study was conducted to evaluate persistency, survival and recovery in two species of grass, Bromus inermis and Dactylis glomerata that had been affected by two types of prolonged irrigation regimes (normal irrigation and deficit irrigation). For this purpose 36 genotypes of each species, which had been managed by two different irrigation managments for four years, were evaluated during 2015-2016 according to a completely randomized block design with 6 replication per irrigation management (environment). The results showed that there were high genetic variation in two species for the measured traits. Water deficit irrigation management decreased most of the traits such as dry mater yield, plant height, number of stem and day to ear emergence. For measuring survival and recovery after drought we stopped irrigation for 45 days in the first summer of 2016 and then re-irrigated both environments in a similar way again. Genotypes of both species also showed high genetic variation for survival and recovery. In Bromus inermis more genotypes recovered after re-irrigated indicating high ability of this specie in recovery after a long period of drought. Principle component analysis in Bromus inermis showed that high yielding genotypes did not show high persistency while in Dactylis glomerata there was positive correlation between forage yield and persistency. The results also showed that genotypes of both species with high persistency are usually early flowering. High variation exist among genotypes of these two species in terms of survival and recovery after drought indicated that developing of varieties with high persistency and drought tolerance is possible in this germplasm. Keywords : Bromus inermis , Dactylis glomerata , Persistency, Survival, Recovery
