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To determine the structure-activity relationships of natural aromatic cytokinins, the activity of 6-benzylaminopurine (BAP) and its hydroxylated derivatives was compared in three bioassays based on stimulation of tobacco callus growth, retention of chlorophyll in excised wheat leaves, and dark induction of betacyanin synthesis in Amaranthus cotyledons. The aromatic cytokinins 6-(2-hydroxybenzylamino)purine...
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