Abstract
The gibberellic acid applied to intact higher plants has been known to induce a marked stern elongation and a leaf expansion with further changes in several tissue components. For herbage crops, however, there is only a few informations on the significant changes of nutrients. In the experiment, gibberellic acid solution of concentration of 50 ppm was sprayed twice to intact Japanese honeywort which had a relatively high content of ascorbic acid. The assay was made for some nutrients in both the applied and not applied crops. As a measure of the ascorbic acid oxidase activity, oxygen uptake was determined by using L-ascorbic acid as substrate.
It was found that gibberellic acid promoted the growth of Japanese honeywort and increased the contents of ascorbic acid, total phosphorus, in spite of the decrease in the dry matter amount and in the crude ash content of the fresh tissue.
