کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2017531 | 1067801 | 2011 | 6 صفحه PDF | دانلود رایگان |
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.
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► 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.
Journal: Plant Science - Volume 181, Issue 4, October 2011, Pages 479–484