Journal article
Cadmium accumulation is enhanced by ammonium compared to nitrate in two hyperaccumulators, without affecting speciation
Journal of experimental botany, Vol.67(17), pp.5041-5050
2016
PMCID: PMC5014155
PMID: 27385767
Abstract
Nitrogen fertilization could improve the efficiency of Cd phytoextraction in contaminated soil and thus shorten the remediation time. However, limited information is available on the effect of N form on Cd phytoextraction and associated mechanisms in plants. This study examined the effect of N form on Cd accumulation, translocation, and speciation in Carpobrotus rossii and Solanum nigrum. Plants were grown in nutrient solution with 5-15 mu M Cd in the presence of 1000 mu M NH4+ or NO3-. Plant growth and Cd uptake were measured, and Cd speciation was analyzed using synchrotron-based X-ray absorption spectroscopy. Shoot Cd accumulation was 30% greater with NH4+ than NO3- supply. Carpobrotus rossii accumulated three times more Cd than S. nigrum. However, Cd speciation in the plants was not influenced by N form, but it did vary with species and tissues. In C. rossii, up to 91% of Cd was bound to S-containing ligands in all tissues except the xylem sap where 87-95% were Cd-OH complexes. Furthermore, the proportion of Cd-S in shoots was substantially lower in S. nigrum (44-69%) than in C. rossii (60-91%). It is concluded that the application of NH4+ (instead of NO3-) increased shoot Cd accumulation by increasing uptake and translocation, rather than changing Cd speciation, and is potentially an effective approach for increasing Cd phytoextraction.
Details
- Title
- Cadmium accumulation is enhanced by ammonium compared to nitrate in two hyperaccumulators, without affecting speciation
- Authors/Creators
- Miaomiao Cheng - La Trobe UniversityPeng Wang - The University of QueenslandPeter M. Kopittke - The University of QueenslandAnan Wang - AgriBioPeter W. G. Sale - La Trobe UniversityCaixian Tang - La Trobe University
- Publication Details
- Journal of experimental botany, Vol.67(17), pp.5041-5050
- Publisher
- Oxford University Press on behalf of the Society for Experimental Biology.
- Number of pages
- 10
- Identifiers
- 991005620343307891
- Copyright
- © The Author 2016.
- Murdoch Affiliation
- Centre for Sustainable Farming Systems
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Domestic collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.91 Contamination & Phytoremediation
- 3.91.172 Phytoremediation Mechanisms
- Web Of Science research areas
- Plant Sciences
- ESI research areas
- Plant & Animal Science