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Cadmium in plants: uptake, toxicity, and its interactions with selenium fertilizers

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Abstract

Cd is the third major contaminant of greatest hazard to the environment after mercury and lead and is considered as the only metal that poses health risks to both humans and animals at plant tissue concentrations that are generally not phytotoxic. Cd accumulation in plant shoots depends on Cd entry through the roots, sequestration within root vacuoles, translocation in the xylem and phloem, and Cd dilution within the plant shoot throughout its growth. Several metal transporters, processes, and channels are involved from the first step of Cd reaching the root cells and until its final accumulation in the edible parts of the plant. It is hard to demonstrate one step as the pivotal factor to decide the Cd tolerance or accumulation ability of plants since the role of a specific transporter/process varies among plant species and even cultivars. In this review, we discuss the sources of Cd pollutants, Cd toxicity to plants, and mechanisms of Cd uptake and redistribution in plant tissues. The metal transporters involved in Cd transport within plant tissues are also discussed and how their manipulation can control Cd uptake and/or translocation. Finally, we discuss the beneficial effects of Se on plants under Cd stress, and how it can minimize or mitigate Cd toxicity in plants.

Graphical abstract: Cadmium in plants: uptake, toxicity, and its interactions with selenium fertilizers

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Publication details

The article was received on 23 Aug 2018, accepted on 17 Dec 2018 and first published on 22 Dec 2018


Article type: Critical Review
DOI: 10.1039/C8MT00247A
Citation: Metallomics, 2019, Advance Article

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    Cadmium in plants: uptake, toxicity, and its interactions with selenium fertilizers

    M. A. Ismael, A. M. Elyamine, M. G. Moussa, M. Cai, X. Zhao and C. Hu, Metallomics, 2019, Advance Article , DOI: 10.1039/C8MT00247A

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