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

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.

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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