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Articles

Cytokinins in the Leaves of Ginkgo biloba¹

I. The Complex in Mature Leaves

Department of Botany, University of Natal, Pietermaritzburg 3200, South Africa, Department of Chemistry, University of Natal, Pietermaritzburg 3200, South Africa

Cytokinin conjugates of zeatin, ribosylzeatin, and their respective dihydro derivatives tentatively have been identified as the major cytokinins present in mature Ginkgo biloba L. leaves. Ribosylzeatin was present in higher levels than zeatin and dihydrozeatin. No evidence could be found that 6-(2,3,4-trihydroxy-3-methylbutylamino)purine occurs as a metabolite in the mature leaves. From the available evidence, it is concluded that cytokinin conjugates are probably the major metabolites formed in the leaves of this deciduous gymnosperm.