The effect of osmotic stress induced by PEG (0, -0.75, -1.25, -2.00MPa) on protective enzymes activities, membrane lipid peroxidation, permeability of plasma membrane of different drought-resistant maize (Zea mays L.) cultivars (droughtresistant: Ji-Dan No. 24 (F1) and its parental inbred lines: short 192. (♀) and Yellow Eatry No. 4 (♂) and drought-sensitive: Ye-Dan No. 4 (F1) and its parental inbred lines:8112 (♀) and yellow Early No. 4 (♂) and their relationship to drought resistance were studied. The results showed that the activities of superoxide dismutase (SOD), catatase (CAT), peroxidase (POD) were increased obviously, and the malondialdehyde (MDA) contents and permeability of plasma membrane increased slowly under appropriate osmotic stress. The activies of SOD, CAT decreased, MDAcontents and permeability of plasme membrane were increased obviously, and POD activities increased slowly under severe osmotic stress; SOD, CAT, POD activites of drought-resistant hybrid and its parental lines increased more than those of drought-sensitive hybrid and its parental lines, but MDA contents and permeability of plasma membrane of the formers were lower than those of the laters. It is suggested that keeping a higher level of protective enzymes activities might be one of the reasons which hybrid maize had stronger drought resistant ability.
Journal of Agricultural University of Hebei
Protective enzyme systems