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Histochemical detection of ROS accumulation ((a): O2•−; (b): H2O2) in leaves of tomato seedlings grown in hydroponic nutrient solution by non-pretreated and pretreated with VA (50 μM; 2 d) under drought stress (4 d). Here, C: control, VA: vanillic acid, W0: without water, PEG: 12% PEG).
