FIGURE 3.

Effect of ascorbate (AsA) application on the contents of superoxide [(A) O₂^⋅–)] and hydrogen peroxide [(B); H₂O₂] and malondialdehyde (MDA) production [(C) MDA] of oilseed rape seedlings grown in cadmium (Cd)-treated hydroponics. Oilseed rape seedlings at the five-leaf stage were cultivated in a hydroponic solution containing 10 μM Cd and sprayed with AsA (250 and 500 mg kg^–1). Ten days after treatment, the contents of O₂^⋅–, H₂O₂, and MDA in the roots and leaves were measured. The data are presented as mean ± standard deviation (SD) of the mean of three replications (n = 3). Means denoted by the same letter are not significantly different at the P < 0.05 level according to Fisher’s least significant difference (LSD) test.