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题名: Chromium immobilization by extra- and intraradical fungal structures of arbuscular mycorrhizal symbioses
作者: Wu, SL; Zhang, X; Sun, YQ; Wu, ZX; Li, T; Hu, YJ; Lv, JT; Li, G; Zhang, ZS; Zhang, J; Zheng, LR; Zhen, XJ; Chen, BD
刊名: JOURNAL OF HAZARDOUS MATERIALS
出版日期: 2016
卷号: 316, 页码:34-42
关键词: Arbuscular mycorrhizal fungi ; Chromium ; SEM-EDS ; STXM ; XAFS
DOI: 10.1016/j.jhazmat.2016.05.017
通讯作者: Chen, BD (reprint author), 18 Shuangqing Rd, Beijing 100085, Peoples R China.
文章类型: 期刊论文
英文摘要: Arbuscular mycorrhizal (AM) fungi can enhance plant Cr tolerance through immobilizing Cr in mycorrhizal roots. However, the detailed processes and mechanisms are unclear. The present study focused on cellular distribution and speciation of Cr in both extraradical mycelium (ERM) and mycorrhizal roots exposed to Cr(VI) by using field emission scanning electron microscopy equipped with energy dispersive X-ray spectrometer (FE-SEM-EDS), scanning transmission soft X-ray microscopy (STXM) and X-ray absorption fine structure (XAFS) spectroscopy techniques. We found that amounts of particles (possibly extracellular polymeric substances, EPS) were produced on the AM fungal surface upon Cr(VI) stress, which contributed greatly to Cr(VI) reduction and immobilization. With EDS of the surface of AM fungi exposed to various Cr(VI) levels, a positive correlation between Cr and P was revealed, suggesting that phosphate groups might act as counter ions of Cr(III), which was also confirmed by the XAFS analysis. Besides, STXM and XAFS analyses showed that Cr(VI) was reduced to Cr(III) in AM fungal structures (arbuscules, intraradical mycelium, etc.) and cell walls in mycorrhizal roots, and complexed possibly with carboxyl groups or histidine analogues. The present work provided evidence of Cr immobilization on fungal surface and in fungal structures in mycorrhizal roots at a cellular level, and thus unraveled the underlying mechanisms by which AM symbiosis immobilize Cr. (C) 2016 Elsevier B.V. All rights reserved.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000379564700005
ISSN号: 0304-3894
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/26449
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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