Growth, Antioxidant Enzymes Activities and Photosynthetic Pigments of Two Rice (Oryza sativa L.) Cultivars as Influenced by Application of Gibberellic Acid and Sodium Arsenate

Syeda Fatemeh Fallah, Mansour Afshar- Mohammadian

Abstract


The effects of gibberellic acid (GA3) and sodium arsenate on enzymatic antioxidants activities (superoxide dismutase, guiacol peroxidase and catalase), soluble proteins content, growth and photosynthetic pigments (chl a, chl b, total chl. and carotenoids) of 'Tarom' and 'Shiroudi' rice were investigated. Thirty-days-old seedlings were treated with different concentrations of sodium arsenate (0, 50 and 100 μM) and GA3 (0 and 10 μM) for two weeks. The results showed that sodium arsenate increased the activities of the enzymatic antioxidants and protein content significantly and reduced the growth parameters, chl a, chl b, and carotenoids contents in both cultivars of rice. Meanwhile, GA3 increased the activities of the enzymatic antioxidants, protein content, growth parameters, chl a, chl b, and carotenoids contents significantly in both cultivars of rice treated with sodium arsenate. In general, the results of this study showed that GA3 increased the resistance of the two examined rice cultivars treated with sodium arsenate.

Keywords


Rice, enzymatic antioxidants, gibberellic acid, photosynthetic pigments, sodium arsenate, soluble proteins

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