Abstract
Phenylalanine ammonia-lyase (PAL) and cinnamic acid-hydroxylase (CAH) exhibit parallel activity changes in tissues of Jerusalem artichoke (Helianthus tuberosus L.) tubers during ageing and in vitro culture. The activity of both enzymes appears in the tissue only after slicing and can be stimulated by manganese. Inhibition of CAH, by the deprivation of the substrate O2, leads to cinnamic acid accumulation and PAL inhibition, a process prevented by cycloheximide. It is propounded that the link between PAL and CAH activities is the result of changes of the cinnamic acid pool size produced by a change in the activity of CAH.
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