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Effect of different concentrations of hexavalent chromium and P1 on (a) root lignification, (b) leaf malonaldehyde, and (c) electrolyte leakage of sunflower seedlings grown hydroponically (half-strength Hoagland’s solution) for 16 days in a plant growth chamber. Data are mean of 36 replicates with SE of the mean. Different labels on mean bars represent significance (Duncan; p < 0.05).
