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Pathways of Cd uptake and transfer by plants through roots, stems, and leaves. (A) The pathway of Cd uptake in plant roots from root hair cells in the maturation zone of the root tip, through the exodermis and endodermis to the stele (Xylem). (B) The translocation process of Cd to the aboveground parts through the xylem and phloem after reaching the stele. (C) Schematic diagram of Cd uptake and transport by plant leaves under Cd stress.
