Arsenic accumulation and translocation in the submerged macrophyte Hydrilla verticillata (L.f.) Royle.
Arsenic accumulation and translocation in the submerged macrophyte Hydrilla verticillata (L.f.) Royle.
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沉水植物黑藻 (L.f.) Royle 中砷的积累和易位。
DOI：
10.1016/j.chemosphere.2011.09.051
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发表时间：
2011-11
期刊：
影响因子：
8.8
通讯作者：
Yan, Changzhou
中科院分区：
文献类型：
--
作者：
Xue, Peiying;Yan, Changzhou
全球水生系统中的砷污染需要开发一种具有成本效益的原位植物修复技术。黑藻 (Hydrilla verticillata (L.f.) Royle) 是一种广泛分布于世界各地的沉水植物，具有有效去除水中重金属的潜力。为了了解 H. verticillata 植物过滤砷的潜力及其对水系统中砷循环的影响，我们研究了 H. verticillata 植物中砷的积累、形态和易位。 20μM砷酸盐[As(V)]或亚砷酸盐[As(III)]处理4d后，植物地上部As积累显着，最高>700μgg−1干重(DW)，As(V)和As(III)处理之间无显着差异(P>0.05)。此外，植物体内转运实验结果表明，根和地上部暴露于2μM As(V)和As(III) 4d后，根中As(V)的生物富集因子(BCF)几乎是As(III)的两倍。与芽相比，还观察到根中的砷 BCF 更高。砷主要积聚在根细胞的细胞壁（>根中总砷的73%）和叶的可溶部分（>叶中总砷的60%）。无论提供的砷形式如何[As(III) 或As(V)]，As(V) 是根中的主要形式，As(III) 是叶子中的主要形式。此外，该植物中砷的基叶易位（⩾17%）明显高于顶叶易位（⩽3%）。由于砷在芽中积累以及砷在根中固定在地下，H. verticillata 是一种潜在的砷生物修复植物过滤剂。
Worldwide contamination of arsenic in aquatic systems requires the development of a cost-effective, in situ phytoremediation technology. Hydrilla verticillata (L.f.) Royle, a submerged macrophyte widely distributed throughout the world, has the potential to effectively remove heavy metals from water. In order to understand the potential of H. verticillata for As phytofiltration and its impacts on As cycling in the water system, we investigated As accumulation, speciation and translocation in H. verticillata plants. Plant shoots showed a significant accumulation of As, with a maximum of >700μgg−1dry weight (DW) after exposure to 20μM arsenate [As(V)] or arsenite [As(III)] for 4d, with no significant differences between the As(V) and As(III) treatments (P>0.05). In addition, results of an in planta transport experiment showed that, after exposure of root and shoot to 2μM As(V) and As(III) for 4d, the bioconcentration factor (BCF) in roots for As(V) was almost twofold than that of As(III). Higher As BCFs in roots compared to shoots was also observed. Arsenic accumulated primarily in the cell walls of root cells (>73% of the total As in roots) and in the soluble parts of leaves (>60% of the total As in leaves). Regardless of the form of As supplied [As(III) or As(V)], As(V) was the dominant form in roots and As(III) was the dominant form in leaves. Further, basipetal translocation of As in this plant (⩾17%) was markedly higher than acropetal translocation (⩽3%). Because of accumulation of As in the shoot and immobilization of As below ground in roots, H. verticillata is a potential As phytofiltrator for bioremediation.
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