Phytoremediation: Role of Aquatic Plants in Environmental Clean-Up by Bhupinder Dhir

Author:Bhupinder Dhir
Language: eng
Format: epub, pdf
Publisher: Springer India, India

3.1.2.1 Caesium (Cs) Transport in Plants

Uptake

Caesium uptake in plants takes place through roots and is facilitated by two transport systems located on plant root cell membranes, namely, the K+ transporter and the K+ channel pathway (Zhu and Smolders 2000). Caesium absorption by plant roots is rapid and this is followed by translocation to the above-ground plant parts. Lower K concentrations in solution promote Cs uptake. At low K concentrations, Cs+ is absorbed by the K+ uptake system of the root. Higher concentrations of K+ strongly suppresses Cs+ uptake. Cs+ is efficiently transported by high-affinity K+ uptake transporter. Increasing concentrations of NH4 + reduce uptake of Cs, while increasing concentrations of divalent cations Ca2+ and Mg2+ slightly reduce the uptake of Cs. This is because divalent cations compete with Cs uptake through competition in the apoplast.

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