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Changes in the spectral pattern of selenium accumulation in Coleus blumei and the effects of chelation

机译：彩叶硒中硒积累的光谱图谱变化及螯合作用

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Chemically enhanced phytoremediation has been proposed as an effective approach to remove heavy metals from contaminated soil through the use of high biomass production plants. This study investigated changes in the spectral pattern of selenium (Se) accumulation in Coleus blumei Benth. (coleus) plants grown in hydroponics with 1.0 mg/l sodium selenite (Na2SeO3) and the effects of (S,S)-ethylenediamine disuccinic acid (EDDS) thereon through X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDXS) and Fourier transform infrared (FTIR) spectroscopy analyses. When EDDS concentrations were in the range of 0-1.0 mmol/l, Se content increased significantly; however, at EDDS concentrations above this range, the symptoms of Se toxicity were alleviated in coleus leaves. Application of EDDS over 1.0 mmol/l significantly decreased total Se uptake in the leaves and roots of the plants. The powder diffraction patterns of the roots and leaves displayed sharp crystalline peaks, which were characteristic of an organic molecule with crystallinity. Our results revealed the presence of high amounts of C, O, Mg, Al, Si, K and Ca in the roots and leaves under Se-induced stress with different concentrations of EDDS. There were no changes in the chemical compositions of the roots and leaves, but the contents were influenced by Se-induced stress and EDDS treatment. This study demonstrated the importance of applying XRD, EDXS and FTIR methods toward a more comprehensive understanding of the mechanisms of EDDS-induced Se accumulation in plants.
机译：已经提出化学增强的植物修复是通过使用高生物量生产设备从受污染的土壤中去除重金属的有效方法。这项研究调查了彩叶锦葵中硒（Se）积累的光谱模式的变化。 （彩叶）植物在水培法中用1.0 mg / l亚硒酸钠（Na2SeO3）种植，并通过X射线衍射（XRD），能量色散X射线光谱法对（S，S）-乙二胺二琥珀酸（EDDS）的影响EDXS）和傅立叶变换红外（FTIR）光谱分析。当EDDS浓度在0-1.0 mmol / l范围内时，Se含量显着增加。然而，在EDDS浓度高于此范围时，锦紫苏叶中的Se毒性症状得到缓解。超过1.0 mmol / l的EDDS施用显着降低了植物叶片和根部的总硒吸收量。根和叶的粉末衍射图显示出尖锐的结晶峰，这是具有结晶性的有机分子的特征。我们的结果表明，在不同浓度的EDDS下，Se诱导的根和叶中都含有大量的C，O，Mg，Al，Si，K和Ca。根和叶的化学组成没有变化，但其含量受硒诱导的胁迫和EDDS处理的影响。这项研究证明了应用XRD，EDXS和FTIR方法对植物中EDDS诱导的Se积累机理的更全面理解的重要性。

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