Ascorbic acid requirement for increased peroxidase activity during potato tuber slice aging

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Abstract
The increase in peroxidase activity during aging is a well known process depending on de novo enzyme synthesis. The enhancement of peroxidase is strongly inhibited by lycorine, an ascorbic acid biosynthesis inhibitor. The inhibitory effect of lycorine can be abolished by experimentally increasing the ascorbic acid concentration in the tissues. Conversely, glucose‐6‐phosphate dehydrogenase enhancement ‐ which also occurs during the aging of potato slices ‐ depends on protein synthesis but does not require ascorbic acid. It is suggested that the role of ascorbic acid in the development of peroxidase activity may be related to controlling the synthesis of hydroxyproline‐containing proteins. A possible relationship between peroxidase increase and hydroxyproline‐containing proteins biosynthesis is discussed.