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Inhibiting effect of PAO on FC-induced activation of the PM H+-ATPase. PM H+-ATPase activity was measured at pH 6.4 (gray bars) or pH 7.5 (white bars) in PM isolated from radish seedlings (A) and cultured Arabidopsis cells (B) treated with increasing concentrations of PAO for 60 min, followed by a treatment with 5 μm FC for 120 min. Numbers on top of the white bars represent the corresponding pH ratios.
