Fig. 1. Activity of (A) superoxide dismutase (SOD), (B) ascorbate peroxidase (AP), (C) glutathione reductase (GR), and (D) peroxidase (POD) as affected by 21 d of different depths of waterlogging (WL) in creeping bentgrass. The CL, WL-1, and WL-15 represent well-drained control, WL at 1 cm below the soil surface, and WL at 15 cm below the soil surface, respectively. Means followed by the same letter are not significantly different at P < 0.05. Vertical bars show ± S.E. of mean.