Starch Formation in Storage Organs V

Changes in Phosphorylase Activities during the Development of Potato Tubers

Abstract

The phosphorylase content of potato tubers was measured in the course of their development.
It was found that the amount of phosphorylase increased rapidly with the development of the tuber until the tuber grew to about 50g in weight. Thereafter the increase in enzyme content dropped gradually and nearly ceased when the tuber attained the weight of about 100g.
It became probable that the increase in enzyme activity might be attributed chiefly to that in the “cortex with buds”.
Sincere appreciation is expressed to Prof. T. Miwa, of the Tokyo University of Education, for his valuable advice and criticism during the course of this investigation and in preparation of this manuscript.