Preparation of Radioactive Gibberellin A1 and its Metabolism in Dwarf Peas

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Abstract
Gibberellin A1-3,4-3h was prepared by selective catalytic reduction of gibberellic acid with a mixture of tritium and hydrogen. 3H-GA1 was applied at physiological concentrations to dwarf peas and the metabolism of the hormone was investigated. 3h-GA1 was converted to an acidic, biologically active compound. Radioactive but biologically inactive compounds were also found in the neutral fraction and could not be converted to acidic gibberellins by hydrolysis. No attachment of gibberellin to any macromolecular fraction was evident.