The speciation and distribution characteristics of Cu in Phragmites australis (Cav.) Trin ex. Steudel
The speciation and distribution characteristics of Cu in Phragmites australis (Cav.) Trin ex. Steudel
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芦苇中铜的形态和分布特征。
DOI：
10.1111/plb.12989
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发表时间：
2019
期刊：
影响因子：
3.9
通讯作者：
Huang X
中科院分区：
文献类型：
--
作者：
Wu J;Wang L;Ma F;Zhao L;Huang X
地下茎多年生植物中重金属在不同克隆器官、微域和亚细胞结构中的分配及其固存机制尚未得到系统研究。本研究采用电感耦合等离子体质谱（ICP-MS）、同步辐射X射线显微荧光光谱和X射线吸收光谱等技术，研究了Cu在芦苇根、茎和叶中的形态分布特征，分析了Cu在芦苇根、茎和叶中的分布特征，并对芦苇根、茎和叶中Cu的形态分布特征进行了分析。结果表明，Cu在根中的分布明显优于在茎和叶中的分布。Cu在维管束中的含量高于其周围的表皮、髓腔外的内皮层和薄壁组织。结果表明，虽然Cu可以通过柠檬酸铜转运到根和茎的维管组织中，但植物吸收的大部分金属因其与细胞壁的高度结合而滞留在根中，从而阻止了金属向植物地上部分的转运。因此，澳洲赤杨表现出高的能力，积累铜在根中，因此是一个合适的植物稳定干预的物种。
Heavy metal allocation and the mechanism(s) of metal sequestration in different clonal organs, micro‐domains and subcellular structures has not been systematically studied for rhizomatous perennial plants. It is thus pertinent to investigate knowledge of the speciation and distribution characteristics of Cu inPhragmites australisto elucidating the mobility of metals in wetland plants after their uptakeviaroot systems so as to facilitate development of strategies to enhance Cu tolerance.This study investigated the distributions of Cu inP. australisroot, stem and leaf using ICP‐MS, synchrotron‐based X‐ray micro‐fluorescence and X‐ray absorption spectroscopy, then evaluated the effects of Cu on cellular structure and ultrastructureviatransmission electron microscopy.The results indicate a clear preferential localisation of Cu in the roots as compared with the shoots (stems and leaves). The intensity of Cu in the vascular bundles was higher than that in the surrounding epidermis and the endodermis and parenchyma outside the medullary cavity. The dominant chemical form of Cu inP. australiswas similar to Cu citrate.The results suggest that although Cu can be easily transported into the vascular tissues in roots and stemsviaCu citrate, most of the metal absorbed by plants is retained in the roots because if its high binding to the cell wall, thus preventing metal translocation to aerial parts of the plants. Therefore,P. australisshowed a high capacity to accumulate Cu in roots, being therefore a suitable species for phytostabilisation interventions.