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Abscisic acid (ABA)‐induced reactive oxygen species were localized at guard cell chloroplasts. (a) Arabidopsis. (b) commelina. (c) fava bean. Confocal micrographs of guard cells treated with 10 μM ABA for 5 min. Reactive oxygen species and chloroplasts were visualized by H2 DCFDA fluorescence and chlorophyll autofluorescence, respectively. Experiments were conducted at 23°C in the light (50 μmol m−2 s−1). Bars = 10 μm for a, and 20 μm for b and c
