| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 2017531 | Plant Science | 2011 | 6 Pages |
The contents of two bioactive compounds (polyphenols and flavonoids) and their antioxidant and enzyme activities were determined in the leaves of six lettuce (Latuca sativa L.) cultivars subjected to 4 different day/night temperatures for 6 weeks.The total polyphenol and anthocyanin contents and the corresponding antioxidant activities were the highest at 13/10 °C and 20/13 °C, followed by 25/20 °C and 30/25 °C. The enzymatic activities of polyphenol oxidase (PPO) and phenylalanine ammonia-lyase (PAL) were also the highest at low day/night temperatures, but the peroxidase (POD) activity was decreased at low day/night temperatures and increased at high day/night temperatures.The most significant positive correlation existed between anthocyanin content and PPO activity, total polyphenols and their antioxidant activities. The results showed that at relatively low temperatures, lettuce plants have a high antioxidant and enzymatic status. These results provide additional information for the lettuce growers.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Anthocyanins, polyphenols, antioxidants, polyphenol oxidase, peroxidase, phenylalanine ammonia-lyase. ► Leaves of six lettuce (Latuca sativa L.) cultivars. ► 4 different day/night temperatures for 6 weeks. ► Positive correlation between anthocyanin and polyphenol contents and polyphenol oxidase activity. ► Various day/night temperatures affect the anthocyanin content and antioxidant and enzyme activities.
