Distribution and Speciation of Cu in the Root Border Cells of Rice by STXM Combined with NEXAFS

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• 作者：Cheng Peng ; Yi Wang ; Lijuan Sun ; Chen Xu…
• 关键词：Cu ; Root border cells ; Mucilage layer ; STXM ; Mapping ; Distribution
• 刊名：Bulletin of Environmental Contamination and Toxicology
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：96
• 期：3
• 页码：408-414
• 全文大小：1,575 KB
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• 作者单位：Cheng Peng (1)
  Yi Wang (1)
  Lijuan Sun (1)
  Chen Xu (1)
  Lijuan Zhang (2)
  Jiyan Shi (1)
  
  1. Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
  2. Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China
  
• 刊物主题：Pollution, general; Environmental Health; Ecotoxicology; Soil Science & Conservation; Environmental Chemistry; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution;
• 出版者：Springer US
• ISSN：1432-0800

文摘

Root border cells (RBCs) serve plants in their initial line of defense against stress from the presence of heavy metals in the soil. In this research, light microscopy and synchrotron-based scanning transmission X-ray microscopy (STXM) combined with near edge X-ray absorption fine structure spectroscopy (NEXAFS) with a nanoscale spatial resolution were used to investigate the effects of copper (Cu) upon the RBCs, as well as its distribution and speciation within the RBCs of rice (Oryza sativa L.) under aeroponic culture. The results indicated that with increasing exposure time and concentration, the attached RBCs were surrounded by a thick mucilage layer which changed in form from an ellipse into a strip in response to Cu ion stress. Copper was present as Cu(II), which accumulated not only in the cell wall but also in the cytoplasm. To our knowledge, this is the first time that STXM has been used in combination with NEXAFS to provide new insight into the distribution and speciation of metal elements in isolated plant cells.