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Effect of citrate-carrier inhibitor on the Al-induced secretion of citric acid in rye. Seedlings were exposed to 0.5 mm CaCl2 solution (pH 4.5) containing 25 μm of PP and PI in the presence of 50 μm Al. After a 12-h exposure, the root exudates were collected and citric acid was analyzed by HPLC. Bar represents sd (n = 3).
