【摘要】 以徐州引种驯化的成年香樟树叶片为材料,采用模拟低温胁迫法(温度处理分别为0℃、-5℃、-10℃、-15℃、-20℃、-25℃),研究了低温对成年香樟膜脂过氧化反应和保护酶活性的影响。结果显示,随着处理温度的降低,其叶片细胞质膜相对透性呈"S"型曲线增大,用Logistic方程计算其半致死温度为-13.40℃。叶片中MDA不断增加,SOD活性、POD活性、游离脯氨酸含量及可溶性糖含量随着处理温度的降低,呈先升后降的变化趋势。更多还原

【Abstract】 The effect of low temperature stress on membrane lipid peroxidation and protective enzyme activity in leaves of Cinnamomum camphora were studied with simulation low-temperature stress method(testing temperature was dropped from 0℃ to-25℃ gradually)in this paper.The results showed that the plasma membrane relative permeability in leaves of Cinnamomum camphora increased like a S-curve as the decreasing of temperature.Logistic equation showed that the semilethal temperature was-13.40℃.The content of MDA in the leaves increased,whereas proline,soluble sugar,the activity of SOD and POD in the leaves increased at first and then decreased as the temperature decreased.更多还原