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.
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Alves et al. (1979) studied this question.