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Plant Physiology 72:86-89 (1983)
© 1983 American Society of Plant Biologists

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Articles

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

Thomas Gianfagna2, Jan A. D. Zeevaart3 and William J. Lusk

Michigan State University, MSU-DOE Plant Research Laboratory, East Lansing, Michigan 48824

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.

2 Present address: Department of Horticulture, Rutgers University, New Brunswick, NJ 08903.

3 To whom correspondence should be addressed.

1 Supported by the United States Department of Energy Contract DE-ACO2-76ERO-1338.




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Copyright © 1983 by the American Society of Plant Biologists