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Biological Activity of O--D-Glucopyranosylzeatin ¹

^a Department of Botany, University of Natal, Pietermaritzburg 3200, Republic of South Africa

Concentrations of 10^–8 to 10^–5M O--D-glucopyranosylzeatin are less active than zeatin and zeatin riboside in the soybean (Glycine max L.) callus bioassay. At a concentration of 10^–4M the glucoside was, however, more active or alternatively less toxic than similar concentrations of zeatin and zeatin riboside. Applied zeatin-O-glucoside is readily metabolized by soybean callus and both zeatin and zeatin riboside could be extracted from callus grown on basal medium containing the O-glucoside.