Fig. 3. Superoxide dismutase activities in leaves of creeping bentgrass as affected by exogenous applications of zeatin riboside (ZR) at 0 d (A, C) and 14 d (B, D) of high soil temperature (20/35°C, A, B) and high air/soil temperatures (35/35°C, C, D). Vertical bars indicate LSD values (P = 0.05) for temperature and ZR concentration comparisons at a given day.