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The specific activity of (A) glutathione reductase (GR), (B) ascorbate peroxidase (APX), (C) dehydroascorbate reductase (DHAR) and (D) monodehydroascorbate reductase (MDHAR) of wheat varieties under control and heat-stressed conditions. Vertical bars represent +/− SE values. Different letter(s) indicate significant difference at p < 0.05.
