FIGURE 3.

Effect of ABA treatment on the stomatal aperture. (A) Microscope images of stomata from WT, mutant and overexpressing plants under standard growth conditions (– ABA) or following 5 h exposure to 20 μM ABA (+ ABA). Bars = 5 μm. (B) Measurement of the stomatal apertures of WT, mutant and overexpressing plants under standard growth conditions (– ABA) or following 5 h exposure to 20 μM ABA (+ ABA). Each value represents the mean ± SD. Approximately 50 stomata from each genotype were analyzed in three independent experiments. Significant differences relative to the WT are shown as ^∗∗P < 0.01.