水分胁迫对青冈叶片活性氧的伤害  

Active Oxygen Damage to the Cyclobalanopsis glauca Leaves During Process of Water Stress

作　　者：林永英[1] 

机构地区：[1]福建农林大学林学院,福建南平353001

出　　处：《福建林学院学报》2002年第1期34-37,共4页Journal of Fujian College of Forestry

基　　金：福建省自然科学基金资助项目 (C95 0 2 8)

摘　　要：利用 PEG根际模拟水分胁迫法 ,对青冈苗木进行了不同程度的水分胁迫处理 ,研究了青冈苗木在各种胁迫条件下相对含水量、质膜透性及活性氧代谢的变化规律 .结果表明 ,相对含水量、质膜透性及 MDA含量随胁迫进程呈持续上升趋势 .而活性氧清除酶类 SOD、POD、CAT活性在不同程度水分胁迫前期均呈上升趋势 ,并在保持一段时间的稳定后 ,出现下降趋势 .同时发现 ,适度水分胁迫在一段时间内可使各清除酶活性呈上升趋势 .低度水分胁迫 ,各种酶活性上升较慢 ;但胁迫强度过高 ,反而会导致酶活性的降低 .水分胁迫期间 ,活性氧代谢的这些变化规律 。By physiological analysis on the Cyclobalanopsis glauca seedlings,we measured the changes of relative water content,membrane lipid osmosis and the metabolism of active oxygen under different water stress with osmotic stress by PEG.The results showed that the relative water content,membrane lipid osmosis as well as MDA content increased consistently during the process of stress;the activities of SOD,POD and CAT initially increased and then stabilized for a while,at last declined.All results indicated that proper water stress made activities of Enzymes stay on high level.During the water stress,the changes of active oxygen reflected the dynamic balance between free radicals and antioxidant exterminating enzymes

关 键 词：水分肋迫 青冈 活性氧清除酶 质膜透性 相对含水量 丙二醛 

分 类 号：S792.160.1[农业科学—林木遗传育种]