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Complexation and detoxification of Zn and Cd in metal accumulating plants

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Abstract

Metal accumulating plants exposed to toxic levels of zinc (Zn) and cadmium (Cd) uptake metals through extracellular and intracellular complexation with inorganic and organic ligand formation. However, little is known about the nature and formation mechanism of these metal–ligand complexes. Though, Zn and Cd have many similar chemical properties, yet their complexation and compartmentalization in plants vary with plant species. In principal, the question arises what factors govern Zn and Cd partitioning in plants? What form of the metal is taken up by the root, and is further distributed and accumulated in both vegetative and reproductive tissues? Therefore, the aim of present study is to address several questions concerning the mechanisms of Zn and Cd coordination and compartmentalization in plants using X-ray absorption spectroscopy (XAS) technique. XAS allows direct determination of elemental oxidation states and coordination environments in different plant tissues. This review article briefly explains some other important techniques of XAS; EXAFS (extended X-ray absorption fine structure) and XANES (X-ray absorption near edge structure), which are employed for determining Zn and Cd complexation within the plant. Therefore, In present review, the predominant as well as the minor chemical forms of Zn and Cd present in particular plant tissue have been discussed which could give better insight towards metal accumulation and detoxification mechanisms operated in plants. This information could assist in employing suitable hyperaccumulator plants for metal phytoextraction and reclamation of metal contaminated sites.

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The authors gratefully acknowledge the concept and literature provided on the theme by various workers and two anonymous reviewers for critically going through and providing valuable comments on the manuscript.

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  1. Ecotechnology Laboratory, Department of Environmental Sciences, G.B. Pant University of Agriculture and Technology, Pantnagar, 263145, India

    Shweta Saraswat & J. P. N. Rai

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Saraswat, S., Rai, J.P.N. Complexation and detoxification of Zn and Cd in metal accumulating plants. Rev Environ Sci Biotechnol 10, 327–339 (2011). https://doi.org/10.1007/s11157-011-9250-y

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