Effect of salt stress and its interaction with ascorbate on catalase, ascorbate peroxidase activity, proline and malondialdehyde in Cuminum cyminum L.four weeks after germination

Ascorbate as a strong antioxidant has a considerable bio effect on growth of plants, such as increase in their tolerance against environment stresses. In this investigation, the effect of salt stress and its interaction with ascorbate on amount of proline, catalase and ascorbate peroxidase enzymes and MDA in a medicinal plant of Cuminum cyminum L. was randomly studied in the green house conditions with three replications. Plants were treated by different concentrations of NaCl (0, 25, 50, 75, 100, 125 mmolar) and ascorbate (9 mmolar). In the plants treated with salt, the amount of proline, antioxidant enzymes activity and MDA were increased with increasing NaCl concentrations. The plants treated with NaCl and ascorbate at the same time in a same NaCl concentration, the amount of proline, catalase activity, ascorbate peroxidase and MDA were increased. The results indicated that the ascorbate was one of the antioxidants that caused an increase in resistance of Cuminum cyminum L. to salt stress.