Cadmium accumulation is enhanced by ammonium compared to nitrate in two hyperaccumulators, without affecting speciation
journal contributionposted on 2021-01-06, 01:04 authored by M Cheng, P Wang, PM Kopittke, A Wang, Peter SalePeter Sale, Caixian TangCaixian Tang
© 2016 The Author 2016. Published by Oxford University Press on behalf of the Society for Experimental Biology. 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 μM Cd in the presence of 1000 μM 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.
JournalJournal of Experimental Botany
Pagination10p. (p. 5041-5050)
PublisherOxford University Press
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Science & TechnologyLife Sciences & BiomedicinePlant SciencesCarpobrotus rossiiCd speciationCd translocationhalophytesnitrogen formphytoremediationSolanum nigrumsynchrotronXANESRAY-ABSORPTION SPECTROSCOPYSOLANUM-NIGRUM L.NITROGEN FORMMETAL ACCUMULATIONORGANIC-ACIDSSOIL-PHZINCPLANTLEAVESCDAizoaceaePlant ShootsCadmiumAmmonium CompoundsOxazinesAbsorptiometry, PhotonEnvironmental Restoration and RemediationXANES.Plant Biology & Botany