摘要： 为探讨外源SA对低温胁迫下养心菜生理代谢的调节作用，以养心菜为试材，在0，5℃低温胁迫下，分析叶面喷施不同浓度（0，0.5，1.0，2.0，4.0 mmol/L）的水杨酸（SA）对养心菜膜透性、MDA含量、抗氧化酶活性、可溶性蛋白、脯氨酸、叶绿素含量以及叶绿素荧光参数的影响。结果表明：0.5，1.0，2.0 mmol/L的水杨酸处理均能抑制低温下养心菜相对电导率和MDA的升高，提高养心菜叶片SOD和POD活性，增加可溶性蛋白、脯氨酸和叶绿素含量，也使养心菜叶片Fv/Fm的下降幅度减缓，光抑制对植物的伤害也得以减缓，养心菜的抗寒指标在低温下均有不同程度的缓解。同一浓度的水杨酸处理对不同温度的作用效果不同。综合评价的结果显示，1.0 mmol/L SA处理对养心菜在5℃低温下的缓解效果最好。

关键词: 水杨酸, 低温胁迫, 养心菜, 生理代谢

Abstract: In order to analyze the regulating effect of 0,5℃ low temperature treatment on the Sedum aizoon L.with salicylic acid of different concentrations (0,0.5,1.0,2.0,4.0 mmol/L) on membrane permeability,MDA content,antioxidant enzyme activity,soluble protein,proline,chlorophyll content and chlorophyll fluorescence parameter to investigate the effects of its pretreatment on leaf physiological metabolism.The results showed that 0.5,1.0,2.0 mmol/L concentration of salicylic acid processing,salicylic acid treatment could inhibit raising relative conductivity and MDA increasing,improving SOD,POD activity in the leave of Sedum aizoon L.;Increasing soluble protein,proline,chlorophyll content,could also slow down the Fv/Fm decline under low temperature stress,slowed photo inhibition damage to plants, Sedum aizoon L.at low temperatures cold indicators had varying degrees of ease.Evaluation results expressed,salicylic acid concentration of 1.0 mmol/L was the best for 5℃ low temperature stress in Sedum aizoon L..

Key words: Salicylic acid, Low temperature stress, Sedum aizoon L., Physiological metabolism

中图分类号: 

• S634.01