Even if I understand that some heavy metals such as Cd are more mobile than Pb, as an instance, I am still not sure why the Casparian Strip does not work avoiding the uptake of Cd, and whereas, this heavy metal can be translocated to the fruits and grains of plants. I mean, if the Casparian Strip really works, it means avoidance of entrance of all heavy metals, or is there any relationship with the valency of the chemistry of the particular metal? Thanks in advance

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