水分胁迫对龙眼幼苗叶片膜脂过氧化及内源保护体系的影响

对龙眼（ＤｉｍｏｃａｒｐｕｓｌｏｎｇａｎａＬｏｕｒ．）实生幼苗进行人工水分胁迫，检测其抗氧化酶和抗氧化剂的变化，研究了干旱对叶片膜脂过氧化及内源保护体系的影响，结果表明，在水分胁迫下，龙眼叶片ＲＷＣ下降，电解质渗漏上升，ＲＷＣ的下降和电解质渗漏的上升呈极显著负相关；叶片中ＳＯＤ和ＰＯＤ活性及ＭＤＡ含量明显上升，且与电解质渗漏的增加呈极显著正相关；叶片中可溶性蛋白质，ＧＳＨ含量和ＡｓＡ－ＰＯＤ活性显

EFFECTS OF WATER STRESE ON LEAF MEMBRANE LIPID PEROXIDATION AND ENDOGENOUS PROTECTIVE SYSTEMS IN LONGAN YOUNG SEEDLINGS

The effects of water stress on leaf membrane lipid peroxidation and endogenous protective systems in longan (Dimocarpus longana Lour.) young seedlings were studied.Under water stress,the relative water content (RWC) decreased and the electrolyte leakage of plasma membrane increased;there was a negative linear correlation between RWC and electrolyte leakage;the activities of superoxidase dimutase (SOD) and peroxidase (POD) and the contents of malondialdehyde (MDA) increased and there were positive linear correlations with electrolyte leakage;the contents of reduced glutathione (GSH) and soluble protein and the activity of ascorbate peroxidase(AsA POD)gradually decreased when water stress gradually increased and there were negative linear correlations with electrolyte leakage and the content of MDA;the activities of glutathione reductase (GR) and catalase (CAT) increased at first,then decreased.