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Chromium immobilization by extra- and intraradical fungal structures of arbuscular mycorrhizal symbioses
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; Zhang J(张静); Zheng LR(郑黎荣)
2016
发表期刊JOURNAL OF HAZARDOUS MATERIALS
卷号316页码:34-42
文章类型期刊论文
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.
关键词Arbuscular mycorrhizal fungi Chromium SEM-EDS STXM XAFS
DOI10.1016/j.jhazmat.2016.05.017
关键词[WOS]ORGAN-CULTURE CONDITIONS ; NEAR-EDGE STRUCTURE ; GLOMUS-INTRARADICES ; EXTRARADICAL MYCELIUM ; HEXAVALENT CHROMIUM ; CYNODON-DACTYLON ; MINE TAILINGS ; CELL-WALL ; PLANT ; ABSORPTION
语种英语
WOS类目Engineering, Environmental ; Engineering, Civil ; Environmental Sciences
WOS记录号WOS:000379564700005
引用统计
被引频次:8[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/260269
专题多学科研究中心
作者单位中国科学院高能物理研究所
推荐引用方式
GB/T 7714
Wu, SL,Zhang, X,Sun, YQ,et al. Chromium immobilization by extra- and intraradical fungal structures of arbuscular mycorrhizal symbioses[J]. JOURNAL OF HAZARDOUS MATERIALS,2016,316:34-42.
APA Wu, SL.,Zhang, X.,Sun, YQ.,Wu, ZX.,Li, T.,...&郑黎荣.(2016).Chromium immobilization by extra- and intraradical fungal structures of arbuscular mycorrhizal symbioses.JOURNAL OF HAZARDOUS MATERIALS,316,34-42.
MLA Wu, SL,et al."Chromium immobilization by extra- and intraradical fungal structures of arbuscular mycorrhizal symbioses".JOURNAL OF HAZARDOUS MATERIALS 316(2016):34-42.
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