Fig. 5.

Effect of a high concentration of Ca²⁺ on the ABA-induced stomatal closing in rtl1 mutant. Stomatal apertures of WT and rtl1 were measured after incubation for 2.5 h in the presence of 0.1 and 5 mM Ca²⁺ with or without 20 μM ABA. Other conditions were the same as in Fig. 1d. Data represent the mean with SD. Experiments repeated three times on different occasions gave similar results