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  • Title: Anthocyanin content and the activities of polyphenol oxidase, peroxidase and phenylalanine ammonia-lyase in lettuce cultivars.
    Author: Chon SU, Boo HO, Heo BG, Gorinstein S.
    Journal: Int J Food Sci Nutr; 2012 Feb; 63(1):45-8. PubMed ID: 21718113.
    Abstract:
    Anthocyanin content and the activities of polyphenol oxidase (PPO), peroxidase (POD) and phenylalanine ammonia-lyase (PAL) and their relationships were determined in the leaves of six lettuce (Lactuca sativa L.) cultivars, exposed for 6 weeks to alternating three different day/night temperatures. Anthocyanin content was found to be highest at 20/13°C, followed by 25/20°C and 30/25°C, showing accumulation of anthocyanin at low temperatures. Activities of PPO and PAL were also found to be highest at low day/night temperatures, whereas the POD activity was decreased at low day/night temperatures. The most significant positive correlation existed between anthocyanin content and PPO activity (r² = 0.71). The results suggest that various day/night temperature regimes affect anthocyanin content and the activities of PPO, POD and PAL in lettuce.
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