Inhibitory effect of S‐carvone on wound healing of potato tuber tissue

Abstract

Wounded tuber tissue of potato ( Solanum tuberosum L. cv. Gloria) exposed to the monoterpene S‐carvone did show neither suberization nor cambium layer formation, whereas these processes started after 2–4 days in control tissue. Suberized tissue was clearly visible 24 days after the start of the S‐carvone treatment, when the concentrations of S‐carvone and its bioconversion products in the tissue were almost zero and cambium layer formation had not yet started. The inhibition of wound healing coincided with a lack of induction of 3‐hydroxy‐3‐methylglutaryl coenzyme A reductase (HMGR, EC 1.1.1.34). The wounded potato tissue used as control, showed a transient induction of HMGR activity. In S‐carvone treated tissue, the activities of GR (glutathione reductase, EC 1.6.4.2) and AP (ascorbate peroxidase, EC 1.11.1.11) were induced, and the level of glutathione increased four‐ to five‐fold.