Studies on phloem exudation from Yucca flaccida Haw. XIV. Metabolism of 8-14C-zeatin in an excised inflorescense stalk, in phloem exudate and in flower sap

The metabolism of zeatin-8-14C in detached inflorescence stalks of Yucca flaccida has been studied. The compound has been fed either through the xylem or has been added directly to phloem exudate. The results strongly indicate that after uptake by the stalk zeatin is converted into the corresponding mono-, di- and tri-phosphate ribonucleotides, whereas incubation of phloem sap with zeatin only resulted in the formation of the mono-ribonucleotide.