Effects of High Temperature Stress on Physiological Characteristics of Maize Growth Period

Taking maize as experimental materials, researched the change regulation of the malondialdehyde(MDA) content, antiodant enzymes activity(SOD,POD)free proline content and other physiological indexes under different temperature and different time. The results showed that:(1) in seedling leaves, leaves, MDA and free proline content increased with temperature rised;(2) in seedling leaves, protein content decreased with the increase of temperature;(3) SOD and POD activity in leaves first increased with the increase of temperature, and then decreased, and the higher the temperature, the more obvious the change trend. When high temperature stress was 35 ℃, stress time exceeded 24 h, cooling measures were required to ensure the normal growth of corn.