Catalase (CAT) activity in roots of wheat cultivars during germination exposed to 0, 1, 12 and 24 h dehydration stress treatment. One unit of enzyme activity defined as 1 μmol H2O2 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