外源水杨酸对低温胁迫下养心菜生理代谢的调节作用

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。

Regulating of Exogenous Salicylic Acid on Physiological Metabolism of Sedum aizoon L.under Low Temperature Stress

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 con-tent,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,pro-line,chlorophyll content,could also slow down the Fv /Fm decline under low temperature stress,slowed photo inhibi-tion 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..