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. 1983 May;72(1):86–89. doi: 10.1104/pp.72.1.86

Effect of Photoperiod on the Metabolism of Deuterium-Labeled Gibberellin A53 in Spinach 1

Thomas Gianfagna 1,2, Jan A D Zeevaart 1,3, William J Lusk 1
PMCID: PMC1066174  PMID: 16662988

Abstract

Application of gibberellin A53 (GA53) to short-day (SD)-grown spinach (Spinacia oleracea L.) plants caused an increase in petiole length and leaf angle similar to that found in plants transferred to long days (LD). [2H] GA53 was fed to plants in SD, LD, and in a SD to LD transition experiment, and the metabolites were identified by gas chromatography with selected ion monitoring. After 2, 4, or 6 SD, [2H]GA53 was converted to [2H]GA19 and [2H]GA44. No other metabolites were detected. After 2 LD, only [2H] GA20 was identified. In the transition experiment in which plants were given 4 SD followed by 2 LD, all three metabolites were found. The results demonstrate unequivocally that GA19, GA20, and GA44 are metabolic products of GA53, and strongly suggest that photoperiod regulates GA metabolism, in part, by controlling the conversion of GA19 to GA20.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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