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Effect of chitosan on light-induced stomatal opening in tomato leaf epidermis. Note that 3 mg/mL catalase (A) and 10 mm ascorbic acid (B) suppressed the inhibitory effect of chitosan (100 μg/mL in A or 200 μg/mL in B) on stomatal opening. Experimental procedures are described in Methods. Results are the averages ± se (n = 120) of three to four independent experiments.
