Department of Fisheries and Marine Science, Faculty of Science, Noakhali Science and Technology University, Noakhali, Bangladesh.
Department of Fisheries and Marine Science, Faculty of Science, Noakhali Science and Technology University, Noakhali, Bangladesh.
Sci Total Environ. 2021 Apr 10;764:144637. doi: 10.1016/j.scitotenv.2020.144637. Epub 2020 Dec 24.
Studies from around the world have suggested salt marshes or coastal wetlands can be used as sites for phytoremediation of metals. However, no investigations have been conducted to assess metal accumulation and translocation capabilities of salt marsh macrophytes from Bangladesh coastal area. The aim of this study was to evaluate the uptake and translocation of eight metals, Fe, Zn, Mn, Cu, Co, Rb, Sr, and Pb in Porteresia sp. from the six salt marsh sites of Bangladesh. The leaf, shoots and root tissues of Porteresia sp. samples were analyzed for metals by using the energy-dispersive X-ray fluorescence (EDXRF). The decreasing trend of metal concentrations was, in roots; Fe > Mn > Pb > Cu > Zn > Sr > Rb > Co, in shoots; Mn >Fe > Cu > Pb > Zn > Sr > Rb > Co, in leaves; Fe > Mn > Cu > Pb > Zn > Rb > Sr > Co. Generally, roots of the Porteresia sp. showed high accumulation of the metals when compared to shoots and leaves suggesting relevant availability in the sediment. Pb was the only metal with concentrations significantly higher in the leaves and shoots than in the root. Except for Pb, bioaccumulation concentration factor (BCF) for all metals was lower than 1 in plant organs indicating poor absorption and bioavailability of metals. Higher value (>1) of BCF for Pb infers the species can potentially be used for Pb phytoremediation. However, the translocation factor (TF) confirmed the diversified mobility of the metals from below-ground part to above-ground parts for all the measured metals in the salt marsh species. Highest mobility was observed for Mn and Pb. But it was hard to find any regular trends among all the metals and all the sites.
世界各地的研究表明，盐沼或沿海湿地可以作为植物修复金属的场所。然而，尚未有研究评估孟加拉国沿海地区盐沼大型植物对金属的积累和转运能力。本研究旨在评估来自孟加拉国六个盐沼地点的 Portersia sp.对八种金属（Fe、Zn、Mn、Cu、Co、Rb、Sr 和 Pb）的吸收和转运能力。Portersia sp.的叶片、茎和根组织样品通过能量色散 X 射线荧光（EDXRF）分析金属含量。金属浓度的降低趋势为：根中，Fe > Mn > Pb > Cu > Zn > Sr > Rb > Co；茎中，Mn > Fe > Cu > Pb > Zn > Sr > Rb > Co；叶中，Fe > Mn > Cu > Pb > Zn > Rb > Sr > Co。通常，Portersia sp.的根比茎和叶积累更多的金属，表明在沉积物中有较高的金属相关性。与根和叶相比，Pb 是唯一在叶片和茎中浓度明显较高的金属。除了 Pb，所有金属的生物积累浓度系数（BCF）都低于 1，表明金属的吸收和生物利用度较差。BCF 大于 1（对于 Pb）表示该物种可能可用于 Pb 植物修复。然而，转运因子（TF）证实，在所测量的盐沼物种中，所有金属从地下部分到地上部分的移动性都存在差异。Mn 和 Pb 的迁移性最高。但在所有金属和所有地点之间，很难发现任何有规律的趋势。
