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ABSTRACT

The sucrose content of potato tubers was increased by gamma-irradiation. The activities of enzymes responsible for sugar metabolism in irradiated potato tubers were measured during storage after irradiation. The activities of phosphorylase, sucrose synthase and sucrose phosphate synthase were significantly enhanced by irradiation and remained at a high level while sucrose was accumulated in irradiated tubers. The activities of phosphoglucomutase and phosphoglucose isomerase were little influenced by irradiation. The activity of UDP-glucose pyrophosphorylase was enhanced slightly by irradiation and decreased to a level lower than unirradiated tubers depending upon irradiation dose.