The Fate of 6-(2,3,4-trihydroxy-3-methylbutylamino)purine and N-(purin-6-yl)glycine Injected into Developing Lupin Fruits

Both 6-(2,3,4-trihydroxy-3-methylbutylamino)purine and N-(purin-6-yl)glycine were metabolised slowly when applied to developing fruits of Lupinus albus. Biological activity which co-chromatographed with glucosylzeatin, ribosylzeatin and zeatin was detected in the developing seeds. As the recovered radioactivity did not co-elute with glucosylzeatin or zeatin it would appear as if the applied oxidation products of zeatin were not incorporated readily into free cytokinins. These compounds may however, play an important role in the inactivation, or the regulation of endogenous cytokinin levels in fruits and seeds.