Journal article
Antimony speciation, phytochelatin stimulation and toxicity in plants
Environmental Pollution, Vol.305, pp.1-9
15/07/2022
PMID: 35430314
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Source: InCites
Abstract
Antimony (Sb) is a toxic metalloid that has been listed as a priority pollutant. The environmental impacts of Sb have recently attracted attention, but its phytotoxicity and biological transformation remain poorly understood. In this study, Sb speciation and transformation in plant roots was quantified by Sb K-edge X-ray absorption spectroscopy. In addition, the phytotoxicity of antimonate (SbV) on six plant species was assessed by measuring plant photosynthesis, growth, and phytochelatin production induced by SbV. Linear combination fitting of the Sb K-edge X-ray absorption near-edge structure (XANES) spectra indicated reduction of SbV was limited to ∼5–33% of Sb. The data confirmed that Sb-polygalacturonic acid was the predominant chemical form in all plant species (up to 95%), indicating Sb was primarily bound to the cell walls of plant roots. Shell fitting of Sb K-edge X-ray absorption fine-structure (EXAFS) spectra confirmed Sb–O and Sb–C were the dominant scattering paths. The fitting indicated that SbV was bound to hydroxyl functional groups of cell walls, via development of a local coordination environment analogous to Sb-polygalacturonic acid. This is the first study to demonstrate the key role of plant cell walls in Sb metabolism.
Details
- Title
- Antimony speciation, phytochelatin stimulation and toxicity in plants
- Creators
- Sepide Abbasi - University of NewcastleDane T Lamb - RMIT UniversityGirish Choppala - University of NewcastleEdward D Burton - Southern Cross UniversityMallavarapu Megharaj - University of Newcastle
- Publication Details
- Environmental Pollution, Vol.305, pp.1-9
- Publisher
- Elsevier Ltd
- Grant note
- We acknowledge funding contributions from the Australian Research Council (IN190100044). The XAS work was conducted at the Australian Synchrotron ANSTO (Melbourne, Australia) (AS211/XAS/16917) with the support from Dr Jessica Hamilton. We would like to thank the analytical support of Dr Raja Dharmarajan and Dr Prasath Annamalai (Global Centre for Environmental Remediation, the University of Newcastle) with the analysis of phytochelatins. EDB was supported by a Future Fellowship from the Australian Research Council (FT200100449).
- Identifiers
- 991013014198302368
- Copyright
- © 2022 Elsevier Ltd. All rights reserved.
- Academic Unit
- Faculty of Science and Engineering; Science
- Language
- English
- Resource Type
- Journal article