Fig. 3. AtPCR2 is required under zinc excess and limiting conditions. Phenotypes of the AtPCR2 loss-of-function mutant (pcr2) grown under excess zinc (A) and zinc limiting conditions (B). The dual role is due to the expression of AtPCR2 in the xylem in the root tip (C) and in the epidermis (ep) in the root hair zone (D). Under zinc excessive conditions AtPCR2-GFP is present in high amounts in the epidermis (E) and plays an important role in zinc detoxification, while under zinc limiting conditions AtPCR2-GFP is present only at very low levels in the epidermis (F). ep, root epidermis; x, xylem.