香蕉越冬期ATPase和保护酶的活性及膜脂过氧化

在越冬期，随着气温的降低香蕉叶片腺苷三磷酸酶（ＡＴＰａｓｅ）活性明显提高，３月份后气温上升，活性开始下降．越冬期间超氧物岐化酶（ＳＯＤ）、过氧化氢酶（ＣＡＴ）、过氧化物酶（ＰＯＤ）活性呈下降趋势，膜脂过氧化产物ＭＤＡ含量呈上升趋势，其中台湾蕉ＳＯＤ、ＣＡＴ、ＰＯＤ活性下降幅度比柴蕉大．ＡＴＰａｓｅ水解活性和ＭＤＡ含量明显高于柴蕉，经ＰＰ３３３处理的台湾蕉，ＳＯＤ、ＣＡＴ、ＰＯＤ活性分别比对照提高６６．７７％、８６．４４％和２３７．７６％，ＡＴＰａｓｅ活性下降２４．１５％，ＭＤＡ含量下降２１．６７％，在一定程度上提高了香蕉的抗寒性

ATPase and Protective Enzyme Activity and Membrane Lipid Peroxidation in Banana Leaves in Winter

The activity of ATPase in banana leaves obviously increased along with the decreasing of temperature in winter, then began to decrease along with the increasing of temperature after March. In winter, the activities of SOD, CAT and POD had a decreasing trend, while the content of MDA (produced from peroxidation of membrane lipid) had an increasing trend. Among groups, the activities of SOD, CAT and POD of AAA group decreased more than those of ABB group, while the content of MDA and the activity of ATPase of AAA group was obvious higher than those of ABB group. The activities of SOD, CAT and POD in the treatment with PP333 were 66.77%, 86.44% and 237.76% higher than those of CK, respectively, while the activity of ATPase and the content of MDA were 24.KG-4]15% and 21.67% lower than those of CK. The cold resistance of banana increased with the treatment in certain degree.