Nowadays, salicylic acid is used as a growth regulator to reduce the negative effects of different levels of stress. This research was conducted as factorial experiment on a completely randomized block design. Wheat plants were planted in four levels of cadmium (0, 100, 200 and 300 μmol) with three levels of salicylic acid (0, 0.5 and 1.0 mmol) in three replications. The results showed that root heights, fresh and dry weight of the stem were decreased significantly, and leaf proline and catalase and superoxide dismutase enzymes were increased due to cadmium stress. Foliar application of salicylic acid in non-stress conditions had a significant effect on the traits and resulted in their increase, as well. Application of two concentrations of 0.5 and 1.0 mmol salicylic acid in stress conditions resulted in reduction of the effects of stress and consequently, reduction of proline and catalase and superoxide dismutase enzymes and growth was improved. The amount of 1.0 mmol of salicylic acid was more effective and it can be concluded that salicylic acid has a moderating and decreasing effect on the negative effects of cadmium toxicity in wheat plant.
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