The Effect of Gibberellic Acid on Enzyme Activity and Oxygen Uptake in Bean Plants (Phaseolus Vulgaris)

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Abstract
Young bean plants 96 hours after the application of 10 micrograms of gibberellic acid to the apex of the epicotyl showed on a fresh weight basis that phosphatase activity was increased in the leaves and stems of the treated plants. No differences could be detected for a-amylase and phosphorylase. Treatment with gibberellic acid resulted in a decrease in activity for B-amylase in the leaves and stems, for pectin methyl-esterase in the roots, for oxygen uptake in the first internode, and an increase for B-amylase in the roots. On a plant part basis, however, the oxygen absorption was greater in the internodes of the treated plants.