Ksouri Riadh, Megdiche Wided, Falleh Hanen, Trabelsi Nejla, Boulaaba Mondher, Smaoui Abderrazak, Abdelly Chedly
Laboratoire d'adaptation des plantes aux stress abiotiques, centre de biotechnologie à la technopole de Borj-Cédria (CBBC), 2050 Hammam-lif, Tunisia.
C R Biol. 2008 Nov;331(11):865-73. doi: 10.1016/j.crvi.2008.07.024. Epub 2008 Sep 19.
Halophyte ability to withstand salt-triggered oxidative stress is governed by multiple biochemical mechanisms that facilitate retention and/or acquisition of water, protect chloroplast functioning, and maintain ion homeostasis. Most essential traits include the synthesis of osmolytes, specific proteins, and antioxidant molecules. This might explain the utilization of some halophytes as traditional medicinal and dietary plants. The present study aimed at assessing the phenolic content and antioxidant activities of some Tunisian halophytes (Cakile maritima, Limoniastrum monopetalum, Mesembryanthemum crystallinum, M. edule, Salsola kali, and Tamarix gallica), depending on biological (species, organ and developmental stage), environmental, and technical (extraction solvent) factors. The total polyphenol contents and antioxidant activities (DPPH and superoxide radicals scavenging activities, and iron chelating and reducing powers) were strongly affected by the above-cited factors. Such variability might be of great importance in terms of valorising these halophytes as a source of naturally secondary metabolites, and the methods for phenolic and antioxidant production.
盐生植物耐受盐引发的氧化应激的能力受多种生化机制支配，这些机制有助于保持和/或获取水分、保护叶绿体功能并维持离子稳态。最关键的特性包括渗透调节物质、特定蛋白质和抗氧化分子的合成。这或许可以解释一些盐生植物被用作传统药用植物和食用植物的原因。本研究旨在评估一些突尼斯盐生植物（滨海刺芹、单瓣补血草、冰叶日中花、食用日中花、钾猪毛菜和法国柽柳）的酚类含量和抗氧化活性，这取决于生物学因素（物种、器官和发育阶段）、环境因素和技术因素（提取溶剂）。上述因素对总多酚含量和抗氧化活性（DPPH和超氧阴离子自由基清除活性以及铁螯合和还原能力）有强烈影响。就将这些盐生植物作为天然次生代谢产物来源进行增值以及酚类和抗氧化剂的生产方法而言，这种变异性可能非常重要。
