Abstract
Aqueous solutions of 10−6 m gibberellic acid, irradiated with relatively low doses of gamma rays, failed to induce α-amylase activity in embryoless barley caryopses. The relationship between irradiation dose and gibberellic acid inactivation is an exponential one. Presence of the free hydroxyl radical scavengers, potassium iodide and p-aminobenzoic acid, protects the biological activity of gibberellic acid as it is measured by the α-amlyase bioassay. These results suggest that gibberellic acid in aqueous solutions is inactivated by gamma rays by an indirect action, probably through reactions with free radicals from the radiolysis of water. A reduction in the absorbance peak at 1750 cm−1, corresponding to the γ-lactone ring, follows exposure of gibberellic acid to gamma rays. Irradiation of young barley seedlings does not affect their content in gibberellin-like substances, but in seedlings from irradiated caryopses the concentration of the gibberellinlike substances is reduced.
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