The energy metabolism level of potato tubers is closely related to their post-harvest storage quality.This study explored the relationship between potato quality and energy metabolism at different storage temperatures.The physiological and quality-related indicators of potato tubers stored at 0 ℃, 4 ℃, and 20 ℃, as well as the changes in energy metabolism-related enzymes, substances, and energy charge in tuber tissues, were investigated.Compared to storage at 20 ℃, storage at 4 ℃ effectively inhibited the decrease in potato tuber flesh hardness and the increase in respiratory intensity, thereby efficiently maintaining the high activity of energy metabolic enzymes H+-ATPase, Ca2+-ATPase, cytochrome C oxidase, and succinate dehydrogenase in potato tubers.An increase in adenosine triphosphate, adenosine diphosphate and adenosine monophosphate were observed, and the high energy charge was maintained in the tuber tissues.Compared to storage at 4 ℃, storage at 0 ℃ increased potato respiratory intensity by 2.66 mg/(kg·h) and total soluble sugar by 51.67 g/kg, and decreased the activity of energy metabolism-related enzymes, leading to reduced energy metabolism level, which was not conducive to long-term storage.At 20 ℃, the respiratory rate of the potato tubers and the consumption of carbohydrates significantly increased at the earlier stage, which caused premature germination of tubers and severe energy deficiency at the later stage, leading to significant deterioration in storage quality.These results indicate that a storage temperature of 4 ℃ is optimal for good quality, as it maintains high enzyme activities and energy charge in the potato tubers.
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