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Plant and Cell Physiology, 1979, Vol. 20, No. 1 123-130
© 1979

Article

The presence of gibberellin A20 in Stevia rebaudiana and its significance for the biological activity of steviol1

Leo M. Alves2 and M. Ruddat

The University of Chicago, Department of Biology, Barnes Laboratory Chicago, Illinois 60637, U.S.A.

Gibberellin-like substances of stems and leaves from Stevia rebaudiana were analyzed and gibberellin A20 was identified by gas chromatography-mass spectrometry. The presence of GA20 in S. rebaudiana is significant for the interpretation of the gibberellin activity of steviol. It indicates that steviol, the C-13 hydroxykaurenoic acid, may function as a precursor for C-13 hydroxy-gibberellins and not as a gibberellin analog.

1 This work was supported by National Science Foundation Grant GB 17304 to M. R. and by a Research Grant-in-Aid from Sigma Xi to L. M. A. The research described is from a dissertation submitted by L. M. A. in partial fulfillment of the requirements for the Ph.D. degree.

2 Present address: Laboratory of Plant Morphogenesis, Department of Biology, Manhattan College, Bronx, N. Y. 10471, U. S. A.

(Received June 12, 1978; )
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