The effect of salicylic acid and chelated magnesium sulfate on amount of α-tocopherol and some physiological characteristics of pear (cv. Louise Bonne de Jersey)

The antioxidants are anti-oxidative system in higher plants and therefore their endogenous stimulation or exogenous application of them can be effective in overcoming on stresses. These combinations are included the kinds of enzymatic and non-enzymatic materials such as: vitamins, pigments and so on. In this present experiment, the influence of salicylic acid and chelatedmagnesium sulfate was studied on stimulatory or inhibitory effects on different antioxidants production in the pear's leaves. The experiment was conducted in the ecological conditions of Qazvin province in RCBD in 2013 and plant materials were selected pear trees belonging to Louise Bonne. The studied characteristics in this research include antioxidants of a-tocopherol, carotenoid, chlorophylls a, b and total. The results indicated that salisylic acid and chelatedmagnesium sulfate significantly affected on the content of a-tocopherol antioxidant, chlorophyll and carotenoid in the leaf pear. There was a highly significant difference (P≤ 0.01) among treatments. The changes for chlorophyll pigment were between 1.03 to 6.27 mg/g, for carotenoid between 0.06 to 1.985 mg/g and for a-tocopherol between 0.03 to 2.30 ppm. The LSD indicated that the highest amount of a-tocopherol compound was obtained in the combination of salicylic acid (0.5 g) and chelatedmagnesium sulfate (0.7 g) treatment. It can be interpreted the positive role of the aforementioned treatment in producing stimulation of this antioxidant.