Metabolic Changes Associated with the Germination of Corn. III. Effects of Gibberellic Acid on Endosperm Metabolism

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Abstract
The catabolism of carbohydrates and proteins in excised endosperms of corn was stimulated by exogenous gibberellic acid. The initiation of sugar production was completely dependent, whereas amino-acid production was only partially dependent on added gibberellic acid. The exogenous hormone replaced a component produced by the embryo axis, which was received by the endosprem 36-48 hours after the start of germination. The increase of ribonuclease activity observed during germination can be accounted for in terms of an activation of preexisting enzyme. The increase of 3[image]nucleotidase activity cannot be wholly due to activation of enzyme, neither is it dependent on exogenous gibberellic acid.