Effect of Water Stress on Seed Germination of Agropyron Elongatum, Agropyron Desertourm & Secale Montanum

Physiological effect of six levels of water stress (0, -0.1, -.03, -0.6, -0.9 and -1.2 mp) was studied on seed germination and plumule as well as radicule growth length in three species namely: agropyron elongatum, agropyron desertourm and secale montanum. polyethylene glycol (peg) was used to provide appropriate water potentials. a total of 100 seeds in four replications (petri dishes) were sown from each species. experimental design was a factorial one of complete randomized design. maximum germination rate was obtained at 0 mp. germination rate and plumule and radicule growth declined with water potential level. the most resistance species to water stress are secale montanum, agropyron elongatum and agropyron desertorum respectively.