چكيده لاتين :
In order to study effects of different salinity levels on antioxidant enzyme activities, catalase (CAT),
ascorbate peroxidase (APX) and guaiacol peroxidase (GPX) associated with compatible solutes, proline and
carbohydrate and mineral nutrient content in shoots, sodium and potassium, in three wheat cultivars an
experiment was conducted as completely randomized 3 x4 factorial design with three replicates in a greenhouse.
Three wheat cultivars (Pishtaz, Kavir and Hamon), that differ in their salt tolerances, were grown in four different
salinity levels (S, ~ control, S, ~ 100, S, ~ 200 and S, ~ 300 mM NaCl). Twenty days after wheat cultivars
subjected to salt stress, data showed salinity stress induced increase in the antioxidant enzyme activities.
Among the cultivars, salinity stress decreased leaf-APX but increased the activities of leaf-GPX in Pishtaz
cultivar. Our results showed a positive correlation between praline accumulation and Leaf-APX (rי = 0.56), LeafGPX
(rי = 0.63) and Leaf-CAT (rי = 0.73). In these cultivars, in their shoots Naי showed an increase in
concentration with salinity that approximately matches a decrease in K+ concentration. It seems that Naי
concentrations in the shoot may have had a more significant effect on plant antioxidant enzyme activities and
compatible solutes such as proline and carbohydrates. These results indicated which in wheat under salinity
stress antioxidant enzymes and compatible solutes help to plant adaptation. In this study we found a positive
correlation between Naי concentration in the shoots and the antioxidant enzyme activities and compatible
solutes in the leaves.
