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Effects of silicon on activities of superoxide dismutase and catalase, contents of ascorbic acid and reduced glutathione (GSH) in roots of tomato seedlings grown under water stress. Data are means ± SD (n = 3). Bars with the same letters or without letters are not significantly different between treatments at each time point at P < 0.05. (A) Superoxide dismutase activity; (B) Catalase activity; (C) Ascorbic acid concentration; (D) Reduced glutathione concentration.
