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The Metabolism of Soluble Nucleotides in Wheat Aleurone Layers Treated with Gibberellic Acid ¹

^a Department of Plant Physiology, Waite Agricultural Research Institute, University of Adelaide, Glen Osmond, South Australia

The metabolism of soluble nucleotides was investigated in wheat (Triticum aestivum var. Olympic) aleurone layers treated with gibberellic acid. Whereas nucleotide levels were relatively unaffected by the treatment, a transient increase was observed in the incorporation of ³²P. The effect was maximal 30 to 60 minutes after gibberellic acid was administered, and by 180 minutes incorporation was lower than in the control. The greatest changes were detected in the nucleoside triphosphates, particularly in cytidine triphosphate. The findings are discussed in relation to the mode of action of gibberellic acid.