Effect of membrane lipid peroxidation and photosynthesis rate on water stress under different nitrogen level in maize

Under water deficit, relative plasma membrane permeability of maize mesophyll cell is controlled at low range by favorable nitrogen level, but it can be increased 60.7% to control (CK) by 20 mmol/L in Hoagland nutrition solution. Malondialdehyde (MDA) in maize mesophyll cell can be raised by deficit and excess nitrogen. Chlorophyll and nitrogen content can be increased to increase nitrogen level, but there is a saturation phenomenon. The activity of protective enzymes SOD, POD, CAT, photosynthesis rate and biomass could be increased by suitable nitrogen level under water deficit. But the activity of SOD rise to CK. We think that nitrogen for crop drought resistance has double role in water deficit.