Abstract

The effect of ageing on enzyme levels in potato discs has been examined for 17 enzymes. The activity of most enzymes was found to increase on ageing but of the 17 enzymes only phenylalanine ammonia lyase was stimulated by light. Evidence is presented that the changes in enzyme levels are not due to changes in molecular size. In the case of phenylalanine ammonia lyase, evidence is presented supporting the view that there is a de novo synthesis of the enzyme in both light and dark. The results are briefly discussed in relation to changes in metabolic patterns which are associated with the ageing process in discs of storage tissue.

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