PMID: 9530882Apr 8, 1998Paper

Association of nickel versus transport of cadmium and calcium in tonoplast vesicles of oat roots

Planta
G E Gries, G J Wagner

Abstract

The plant vacuole has long been suspected of being a site for accumulation of Ni in plant roots, but testing this hypothesis directly by vacuole isolation is technically difficult and has not been reported. Here, we have attempted to determine if Ni can be transported into isolated oat (Avena sativa L.) root tonoplast vesicles as an alternative approach toward understanding the importance of the vacuole in Ni accumulation in roots. We found that, in contrast to Ca and Cd, Ni did not affect the proton gradient of vesicles (MgATP energized or artificially created), and further, that Cd/H antiport activity was not affected by the presence of Ni. Nickel was associated with vesicles, but relative rates of accumulation/association of metals with vesicles were Ca > Cd > Ni. Protonophores and the potential Ni ligands citrate and histidine, and nucleoside triphosphates or PPi did not stimulate Ni association with vesicles. Comparison of Ni versus Ca and Cd associated with vesicles using various membrane perturbants indicated that while Ca and Cd are rapidly and principally antiported to the vesicle sap, Ni is only slowly associated with the membrane in a not-easily dissociated condition. Our results indicate the absence of an Ni/H antip...Continue Reading

Citations

Jan 1, 2002·The Arabidopsis Book·Christopher S Cobbett, Richard B Meagher
Apr 12, 2005·Plant Molecular Biology·Jon K PittmanKendal D Hirschi
Feb 27, 1999·Comptes rendus de l'Académie des sciences. Série III, Sciences de la vie·J F Briat, M Lebrun
Mar 23, 2011·Plant Science : an International Journal of Experimental Plant Biology·Hiroaki KudoShigenao Kawai
Jul 21, 2005·Journal of Trace Elements in Medicine and Biology : Organ of the Society for Minerals and Trace Elements (GMS)·Xiaoe YangPeter J Stoffella
Aug 17, 2005·FEMS Microbiology Reviews·David Mendoza-CózatlRafael Moreno-Sánchez
Nov 3, 2004·Environmental Pollution·Moyukh Ghosh, S P Singh
Mar 23, 2011·Plant Science : an International Journal of Experimental Plant Biology·Katarzyna Kabała, Małgorzata Janicka-Russak
Apr 5, 2000·Biochimica Et Biophysica Acta·L E WilliamsJ L Hall
Dec 13, 2001·Journal of Experimental Botany·J L Hall
Feb 4, 2005·Toxicological Sciences : an Official Journal of the Society of Toxicology·Pei-Ming YangLih-Yuan Lin
Feb 26, 2009·FEMS Microbiology Letters·Huey-Wen ChuangYueh-Long Chang
Jul 1, 2005·Functional Plant Biology : FPB·Priscila L GratãoRicardo A Azevedo

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