Effect of Drought Stress on Lipid Peroxidation and Activity of Cell Defense Enzyme in Maize Seedling

Maize were grown in plastic pots in a greenhouse under different water content in soil,including 9%,12%,15%,18%,21% and 24% water content in soil.Germination rate and content of H_2O_2,MDA and chlorophyll were measured.Also,enzymatic antioxidants such as SOD,POD,CAT,etc,which could clean AOS and exist in plant cells,were studied.The results showed that germination rate and chlorophyll content were decreased and H_2O_2 and MDA content were increased with the increasing of water content of soil.SOD activities raised and POD and CAT activities had no significantly chang in light drought-stress.But with more drought-stress,they decreased.This results suggested that the system of the defense enzymes play a key role through balancing all of the responding enzymes under drought condition in plants.