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Leaf water potential and endogenous cytokinins in xylem sap of young apple trees treated with or without paclobutrazol (PBZ) under drought stress conditions were investigated. Three drought and rewatering cycles were used in the experiments and leaf water potential was measured every 2-4 days during the experimental period (39 days). Zeatin (Z) and zeatin riboside (ZR) from the xylem sap in the trunks...
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