Figure 1.

Effects of OGA on light-induced stomatal opening in tomato leaf epidermis. Note that 3 mg/mL catalase (A) and 5 mm ascorbic acid (B), which reduce the level of ROS, reversed the inhibitory effect of OGA (5 μg/mL) on stomatal opening. Experimental procedures are described in Methods. Results are the averages ± se (n = 120) of four independent experiments.