Isolation of zeatin riboside from the chicory root.
From 250 kg of fresh chicory roots about 2 mg of a crystalline cytokinin were obtained. This substance was identified as ribosylzeatin (trans isomer). From the procedure employed it seems unlikely that the isolated cytokinin comes from the degradation of tRNAs; rather, it may constitute a separate pool of cytokinins.
Laboratoire de Physiologie Pluricellulaire, C.N.R.S., Gif-sur-Yvette, France.
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Nitsch