TY - JOUR JF - jispp JO - VL - 8 IS - 29 PY - 2019 Y1 - 2019/5/01 TI - Effects of chilling and high light stress on phenolic metabolism and antioxidant activity of Aloe vera L. plants TT - تأثیر سرما و شدت نور بالا بر متابولیسم فنلی و فعالیت آنتی اکسیدانت گیاه آلوئه ورا N2 - High light (HL) can limit plant photosynthetic activity, growth and productivity. The HL effect was more pronounced in plants grown at low temperature. In order to determine the effects of chilling stress (4 0C) and light intensities (450 and 850 µmol m-2 s-1) on antioxidant defense system and phenolic metabolism of Aloe vera L., an experiment was conducted in a randomized complete block design with four replications in a research greenhouse. The results indicated that the Aloe vera has a stronger HL tolerance. Increased tolerance in HL-treated plants was related to screening of photoradiation by phenolic compounds (but not the mechanism of ROS scavenging). Although total phenolics and flavonoids concentration as well as phenylalanine ammonia-lyase (PAL) and catalase (CAT) activity responded positively to the chilling treatment, but cold stress considerably increased the rise in malondialdehyde (MDA) content (as a marker of lipid peroxidation), suggesting that Aloe vera is sensitive to chilling treatment. Additionally, chilling raised free radical scavenging activities of Aloe vera leaf gel using DPPH radical-scavenging because of an enhancement of total phenolic, and may be recommended for increasing leaf gel quality. SP - 139 EP - 149 AU - Habibi, Ghader AD - Department of Biology, Payame Noor University (PNU), Iran KW - Aloe vera KW - cold stress KW - high light KW - phenolics KW - ROS scavenging system UR - http://jispp.iut.ac.ir/article-1-778-en.html ER -