Characterisation of early responses in lead accumulation and localization of Salix babylonica L. roots.

In transverse sections of the mature zone, Pb levels in the cell wall and cytoplasm of epidermal cells was the lowest compared to cortical and vessel cells, and an increasing trend in Pb content was detected in cortical cells from the epidermis to vascular cylinder.

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The highest TF was found at 1 and 10 μmol/L Pb treatment, and there was a decreasing trend in the TF values as Pb concentrations increased (Table 1 ).

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