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Plant Physiology 50:114-116 (1972)
© 1972 American Society of Plant Biologists

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Articles

Comparison of Zeatin Indoleacetate with Zeatin and Indoleacetic Acid in the Tobacco Bioassay 1

Ruth Y. Schmitza and Folke Skooga

Sidney M. Hechtb,2 and Nelson J. Leonardb

a Institute of Plant Development, Birge Hall, University of Wisconsin, Madison, Wiscosin 53706, b School of Chemical Sciences, University of Illinois, Urbana-Champaign, Illinois 61801

Zeatin indole-3-acetate, 6-[4-(indole-3-acetoxy)-3-methyl-trans-2-butenylamino]purine, is at least as effective as zeatin on a molar basis in satisfying the cytokinin requirement for growth and bud formation in tobacco bioassays. It is less effective than indole-3-acetic acid and is needed as a variable function of the cytokinin concentration for satisfying the optimal requirement of an auxin. Comparisons of the types of growth and yield of tissue obtained with serial concentration of the ester and with equimolar mixtures of its free base and acid indicate that the relative requirement for auxin changes with the concentration of cytokinin and is related to the types of callus growth and differentiation which occur. The results also suggest that the ester serves as a source of auxin only after modification, presumably by hydrolysis to indoleacetic acid.

2 National Institutes of Health predoctoral Research Fellow. Present address: Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Mass., 02139.

1 This work was supported in part at the University of Wisconsin by National Science Foundation Grant GB-25812 and at the University of Illinois by National Institutes of Health Grant GM-05829.






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Copyright © 1972 by the American Society of Plant Biologists