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Comparative Activity of Isomers of Zeatin and Ribosyl-Zeatin on Funaria hygrometrica¹

^a Department of Biology, Lake Forest College, Lake Forest, Illinois 60045

The activities of isomers of zeatin, ribosyl-zeatin, and 6-(,-dimethylallylamino) purine (i⁶Ade) on the moss Funaria hygrometrica are compared by measuring the ability of the cytokinins to induce callus or gametophores. The cis- and trans-ribosyl-zeatins were inactive, and therefore this kind of bioassay cannot be used as evidence for the presence or absence of a cytokinin in tests on natural products.

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