Effect of low temperature stress on the cold resistance of Zea mexicana seedling

Under low temperature stress of 5 ℃ and 15 ℃, the physiological and biochemical indexes related to cold resistance in the leaves of two kinds of new material of forage maize SAUMZ1 No.1 and No.2 were investigated after the treatments of 6, 24, 48, and 72 hours. The change of physiological and biochemical indexes under different low temperature was compared, and the cold resistance of two kinds of new material was analyzed. The results showed that the forage maize SAUMZ1 No.1 had integrity plasma membrane and lower production of MDA, and induced more proline content with the temperature dropped. So forage maize SAUMZ1 No.1 was more cold tolerance than No.2 according to the three physiological indexes.