Abstract
Summary The activity of two enzymes known to be involved in the biosynthesis of cell-wall phenolics in wound-healing potato tuber tissues was monitored in tuber discs treated with abscisic acid (ABA), pectinase, arachidonic acid, or jasmonic acid. Tyramine hydroxycinnamoyl transferase (THT) activity was strongly stimulated by pectinase and, to a lower extent, by ABA. By contrast, ω-hydroxypalmitic acid hydroxycinnamoyl transferase (HHT), which is a good marker of suberin biosynthesis, was induced by ABA, but not by pectinase treatments. Neither arachidonic acid, a known elicitor of phytoalexin biosynthesis in potato tubers, nor jasmonic acid, a putative intermediate in the signal transduction to wounding, significantly modified the time course or the intensity of induction of THT or HHT activities.
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