Effects of salicylic acid on activities of protective enzymes and contents of osmotic adjustment substances of tomato seedlings during NaCl stress | 外源水杨酸对NaCl胁迫下番茄幼苗保护酶活性和渗透调节物质含量的影响

Chinese. 为了探明水杨酸（salicylic acid，SA）对NaCl胁迫下番茄（Lycopersicon esculentum Mill．）幼苗的叶片氧化损伤的影响．对番茄幼苗叶面喷施不同浓度sA（0，100，300，500mg・L. 1），研究了SA对NaCl（100mmol・L. 1）胁迫下番茄幼苗叶片保护酶活性和渗透调节物质含量的影响。结果表明：NaCl胁迫下番茄幼苗叶片中的SOD，POD，CAT活性，游离脯氨酸含量，可溶性蛋白质含量，可溶性糖含量和丙二醛含量上升，SA处理显著提高了NaCl胁迫下番茄幼苗SOD、CAT和POD活性．游离脯氨酸含量、可溶性蛋白质含量和可溶性糖的含量，其中500mg・L. 1SA处理效果最好，其最高值分别比单独NaCl处理植株增加了27．83％、29．52％、27．83％、32．39％、51．39％和13．57％；SA处理显著降低丙二醛的含量，其中500mg・L. 1SA处理效果最好，其最高值比单独NaCl处理植株降低了11．41％。外源SA可以通过提高植株渗透调节能力和抗氧化能力，维持植株水分平衡，保护膜结构和功能，减轻NaCl对番茄幼苗的胁迫伤害。[著者文摘]

English. In order to clarify the protective effects of salicylic acid （SA）on leaf oxidative damage in 100 mmol・L. 1 NaCl stressed tomato （Lycopersicon esculentum Mill.）, the effect of SA （0,100 ,300,500 mg・L. 1） on the leaf protective enzymatic activities and contents of osmotic adjustment substances in tomato seedlings were investigated. The results showed that the leaf activities of SOD, CAT and POD, contents of free praline, soluble protein, soluble sugar and MDA in leaves were significantly increased. SA pretreatment increased significantly the activities of SOD, CAT and POD, contents of free praline, soluble protein, soluble sugar and decreased MDA content. The best effect was observed in the treatment of 500 mg・L. 1 SA. At the highest value, the activities of SOD, CAT and POD increased by 27.83%,29.52 % and 64.79%, contents of free praline, soluble protein and soluble sugar increased by 32.39%,51.39% and 13.57%, content of MDA decreased by 11.41% in comparison with seedling treated with NaCl stress only. The results showed that the best effect on the alleviation of NaCl stress damage was observed in the treatment of 500mg・L. 1 SA. The exogenous SA could play an important role in NaCl-tolerance of tomato seedlings by osmotic regulation, antioxidation,water balance and membrane stability.