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dc.contributor.authorZhao, F.-
dc.contributor.authorHamon, R.-
dc.contributor.authorLombi, E.-
dc.contributor.authorMcLaughlin, M.-
dc.contributor.authorMcGrath, S.-
dc.identifier.citationJournal of Experimental Botany, 2002; 53(368):535-543-
dc.descriptionCopyright © 2002 Oxford University Press-
dc.description.abstractUptake of Cd and Zn by intact seedlings of two contrasting ecotypes of the hyperaccumulator Thlaspi caerulescens was characterized using radioactive tracers. Uptake of Cd and Zn at 2 °C was assumed to represent mainly apoplastic binding in the roots, whereas the difference in uptake between 22 °C and 2 °C represented metabolically dependent influx. There was no significant difference between the two ecotypes in the apoplastic binding of Cd or Zn. Metabolically dependent uptake of Cd was 4.5-fold higher in the high Cd-accumulating ecotype, Ganges, than in the low Cd-accumulating ecotype, Prayon. By contrast, there was only a 1.5-fold difference in the Zn uptake between the two ecotypes. For the Ganges ecotype, Cd uptake could be described by Michaelis–Menten kinetics with a Vmax of 143 nmol g-1 root FW h-1 and a Km of 0.45 µM. Uptake of Cd by the Ganges ecotype was not inhibited by La, Zn, Cu, Co, Mn, Ni or Fe(II), and neither by increasing the Ca concentration. By contrast, addition of La, Zn or Mn, or increasing the Ca concentration in the uptake solution decreased Cd uptake by Prayon. Uptake of Ca was larger in Prayon than in Ganges. The results suggest that Cd uptake by the low Cd-accumulating ecotype (Prayon) may be mediated partly via Ca channels or transporters for Zn and Mn. By contrast, there may exist a highly selective Cd transport system in the root cell membranes of the high Cd-accumulating ecotype (Ganges) of T. caerulescens.-
dc.description.statementofresponsibilityFang-Jie Zhao, Rebecca E. Hamon, Enzo Lombi, Mike J. McLaughlin and Steve P. McGrath-
dc.publisherOxford Univ Press-
dc.subjectCell Wall-
dc.subjectPlant Roots-
dc.subjectCations, Divalent-
dc.subjectCadmium Radioisotopes-
dc.subjectZinc Radioisotopes-
dc.subjectCalcium Channel Blockers-
dc.subjectSpecies Specificity-
dc.subjectBinding Sites-
dc.titleCharacteristics of cadmium uptake in two contrasting ecotypes of the hyperaccumulator Thlaspi caerulescens-
dc.typeJournal article-
dc.identifier.orcidMcLaughlin, M. [0000-0001-6796-4144]-
Appears in Collections:Aurora harvest 2
Environment Institute publications
Soil and Land Systems publications

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