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MJ- or ABA-induced H2O2 production in guard cells is inhibited by 0.5 mm butyrate. Photographs were taken from a representative lot of guard cells from epidermal strips loaded with H2DCF-DA, untreated (A) or submitted to a 30-min pretreatment with 20 μm MJ (B), or 20 μm ABA (E). C and F, Effects of 0.5 mm butyrate on MJ- or ABA-induced H2O2 production, respectively. Photographs were taken using fluorescence (A–C, E, F) or light microscopy (D); bars represent 10 μm.
