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Changes in ascorbate peroxidase (APX) enzyme activity in highly stress tolerant and sensitive wheat roots exposed to 20 % PEG 6000 for 0, 1, 12 and 24 h. One unit of enzyme activity defined as 1 μ mol of ascorbate oxidized min−1. Data represent the means ± SD of three independent experiments (n = 3), a P < 0.05, b P < 0.01, c P < 0.001
