Abstract
Background and aims
Metal species in rhizosphere soil profoundly influence their mobility and phytoavailability. Clarifying the speciation transformation of heavy metals helps understand their translocation and accumulation in plants.
Methods
Single extraction, selective sequential extraction (SSE) and X-ray absorption near-edge structure (XANES) spectroscopy were employed to investigate the speciation transformation of lead (Pb) and its influence on metal accumulation in tea plants after the addition of tea polyphenols (TPs).
Results
Pb content was decreased in young leaves and stems, whereas increased in roots, after TPs were amended to soil. Both SSE and XANES analysis suggested bioavailable Pb was transformed to organically bound Pb after the addition of TPs. The increased percentage of organically bound Pb might be fixed in the cell wall of plant root through a ternary complex formed between the Pb-organic matter complex and cell wall components. Therefore, Pb translocation from roots to young tissues was decreased.
Conclusions
Pb phytoavailability change was driven by its speciation transformation after the addition of TPs. Combined SSE and XANES spectroscopy represent powerful tools to study metal speciation transformation in plant and soil systems.
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Abbreviations
- SSE:
-
Selective sequential extraction
- XANES:
-
X-ray absorption near-edge structure
- TPs:
-
Tea polyphenols
- SOM:
-
Soil organic matter
- DTPA:
-
Diethylene triamine pentaacetic acid
- EDTA:
-
Ethylene diamine tetraacetic acid
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Acknowledgments
The work was supported by the National Natural Science Foundation of China (No. 41201319) and Program for New Century Excellent Talents in University (NCET-11-0455). We would like to express our gratitude to Lirong Zheng and Jing Zhang at the XAFS beamline station of Beijing Synchrotron Radiation Facility (BSRF) for their generous help.
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Duan, D., Peng, C., Xu, C. et al. Lead phytoavailability change driven by its speciation transformation after the addition of tea polyphenols (TPs): Combined selective sequential extraction (SSE) and XANES analysis. Plant Soil 382, 103–115 (2014). https://doi.org/10.1007/s11104-014-2152-3
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DOI: https://doi.org/10.1007/s11104-014-2152-3