FC inhibits ABA-induced stomatal closure. Stomatal apertures were measured under light conditions (300 μmol m-2 s-1) at 25 ± 2°C. Values are the means of 90 measurements ± s.e. from three independent experiments. The asterisks in (A), (B) and (C) indicate that the mean value is significantly different from that of the control at P <0.05 based on Fisher LSD post hoc test, respectively.