Light exposure affects phenolic contents and lipid peroxidation in cabbage seedlings held at low temperatures [Japanese]

摘要

The total phenol and anthocyanin contents increased in leaves of cabbage seedlings growing under a 12-hr photoperiod at a PPFD of 160 mumol . m(-2).sec(-1) and 10/5 degreesC (day/night). In the dark, low temperatures did not induce significant changes in total phenol and anthocyanin contents. When excised leaf discs of cabbage seedlings were incubated at low temperatures with aminooxyacetic acid, an inhibitor of phenylalanine ammonia-lyase, the total phenol contents in the chilled leaf discs decreased gradually in the light and dark. However, the thiobarbituric acid reactive substances (TBARS) content which reflects lipid peroxidation, increased significantly in the leaf discs chilled in the light, but not in the dark. These results suggest that phenolic compounds in leaves of cabbage seedlings have an important role for suppressing lipid peroxidation caused by low temperature and exposure to the light.