In order to study the salicylic acid to alleviate the toxic effects of cadmium on the ryegrass (Lolium perenne L.), a pot experiment was used to determinate of the changes of physiological indicators of the ryegrass under heavy metal cadmium stress spraying exogenous salicylic acid. The results showed that the spraying of 100, 200 and 300 mg/L of the concentration of salicylic acid on the ryegrass under Cd stress had no significant effect at the chlorophyll content, but could increase the contents of the proline and the soluble sugar, the important osmotic adjustment substances, in the ryegrass leaves, enhancement effect of 200 mg/L concentration of salicylic acid on proline content was significantly higher than that of the other concentrations; spraying salicylic acid could significantly increase the activity of SOD, POD, CAT and other antioxidant enzyme, reduce the electrolyte permeability and MDA content in various concentrations. The significant difference between the level difference was not exist, 200 and 300 mg/L concentrations had greater role. The determination of physiological index could state that salicylic acid relieved the toxic effects of cadmium on ryegrass.

ryegrass (Lolium perenne L  )