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Plant Physiology 82:11-14 (1986) © 1986 American Society of Plant Biologists Translocation of Paclobutrazol, a Gibberellin Biosynthesis Inhibitor, in Apple SeedlingsFruit Laboratory, Agricultural Research Center, Agricultural Research Service, United States Department of Agriculture, Beltsville, Maryland 20705, Food Safety Inspection Service, United States Department of Agriculture, P.O. Box 6085, Athens, Georgia 30604 The [(2RS,3RS)-1-(4-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1- yl)-pentan-3-ol] (paclobutrazol, PP333) measured in apple seedlings (`York Imperial' Malus domestica Borkh) was confirmed by gas chromatography-mass spectrometry. Data showed that paclobutrazol was taken up through roots and transported primarily in the xylem through the stems and accumulated in leaves. No detectable basipetal movement of paclobutrazol in apple seedlings was found.
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