The different drought-resistant spring wheat cultivars(drought snsitive Gabsu No.8 and drought-resistant Hongnu No.1)were used in the experi- ments.The process from seed germination to seedling culture was carried out under controlled conditions.On the seventh day,the seedlings were treated with hypertonic culture solution(PEG6000). In the present paper,the effect of water stress on the relative water content (RWC),on the permeability of plasma membrane,on the level of lipid per- oxidation and on the activi...