Atabaki Narges, Shaharuddin Noor Azmi, Ahmad Siti Aqlima, Nulit Rosimah, Abiri Rambod
Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, UPM, Serdang 43400, Selangor, Malaysia.
Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia, UPM, Serdang 43400, Selangor, Malaysia.
Plants (Basel). 2020 Nov 6;9(11):1500. doi: 10.3390/plants9111500.
Arsenic is considered to be a toxic and heavy metal that exists in drinking water and can lead to acute biotoxicity. Water mimosa () has been widely identified as a feasible phytoremediator to clean up aquatic systems. In the current study, the phytoremediation potential of water mimosa exposed to different concentrations of sodium heptahydrate arsenate (NaHAsO·7HO) was tested. A number of plant physiological and growth responses such as height of frond, existence of green leaves, relative growth rate, relative water content, tolerance index, decrease in ratio of biomass and ratio of dry weight, chlorophyll content, photosynthesis rate, intercellular CO concentrations, stomatal conductance, air pressure deficit, transpiration rate, proline and lipid peroxidation, as well as arsenic accumulation and removal efficacy were analyzed. The micromorphological analysis results confirmed water mimosa's tolerance of up to 30 ppm of arsenic treatment. The results obtained from the chlorophyll and gas exchange content also showed severe damage by arsenic at doses higher than 30 ppm. In addition, the highest arsenic accumulation and arsenic removal efficacy were observed at the range of 30-60 ppm. An analysis of proline and lipid peroxidation content confirmed water mimosa's tolerance of up to 30 ppm of arsenic. The scanning electron microscopy (SEM) and X-ray spectroscopy (EDX) and analysis also confirmed the accumulation of arsenic as shown by the deformation of water mimosa tissues. The results showed that water mimosa is a reliable bioremediator for removing arsenic from aquatic systems.
砷被认为是一种存在于饮用水中的有毒重金属，可导致急性生物毒性。含羞草已被广泛认定为一种可行的用于净化水生系统的植物修复剂。在当前研究中，测试了含羞草在暴露于不同浓度的七水合砷酸钠（NaHAsO·7H₂O）时的植物修复潜力。分析了一些植物生理和生长反应，如叶片高度、绿叶的存在情况、相对生长速率、相对含水量、耐受指数、生物量比和干重比的降低、叶绿素含量、光合速率、细胞间二氧化碳浓度、气孔导度、气压亏缺、蒸腾速率、脯氨酸和脂质过氧化，以及砷的积累和去除效果。微观形态分析结果证实含羞草对高达30 ppm的砷处理具有耐受性。从叶绿素和气体交换含量获得的结果也表明，高于30 ppm剂量的砷会造成严重损害。此外，在30 - 60 ppm范围内观察到最高的砷积累和砷去除效果。脯氨酸和脂质过氧化含量分析证实含羞草对高达30 ppm的砷具有耐受性。扫描电子显微镜（SEM）和X射线光谱（EDX）分析也证实了含羞草组织变形所显示的砷积累。结果表明，含羞草是一种从水生系统中去除砷的可靠生物修复剂。
