PJB-2020-218
EVALUATION OF SALT TOLERANCE OF Rosa damascena USING PHYSIOLOGICAL AND ANTIOXIDANT CAPACITY
Houneida Attia
Abstract
Taif rose (Rosa damascena) is a medicinal and aromatic plant, is the most widely used species for production in perfume industry and considered one of the most important economic products of Taif, Saudi Arabia. We examined the impact of different levels of salt on plant development, nutrient status and antioxidant capacity. Both physiological and biochemical measurements were evaluated in the leaves after 21 days of salt application with NaCl 0, 50, 100 and 200 mM. Decreased growth was related to an imbalance in nutrition and a decrease in the accumulation of potassium, calcium and magnesium in the leaves. The salt resistance of R. damascena at 100 mM NaCl was correlated the maintenance of high water and chlorophyll contents. Salt disturbed lipid peroxidation by increasing malondialdehyde content and leads to stimulated H2O2 content. At 200 mM NaCl, a decrease in soluble proteins depending on the concentrations of salt in the medium, a decrease in the specific activities of antioxidant enzymes for superoxide dismutase, catalase and guaiacol peroxidase was observed in conjunction with a reduction in the content of polyphenols, tannins and flavonoids. The results suggest that R. damascena was able to support normal growth and native antioxidant compounds such as antioxidant capacity when cultivated at higher salt levels.
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