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Effects of phosphatidic acid (PA), a product of phospholipase D activity, on Ca2+ and H+ transport were investigated in membrane vesicles obtained from roots and coleoptiles of maize (Zea mays L.). Calcium flows were measured with fluorescent probes indo-1 and chlorotetracycline loaded into the vesicles and added to the incubation medium, respectively. Phosphatidic acid (50–500 μM) was found to induce...