Figure 4.

Analysis of TPX1 expression in root sections of tomato plants treated with 100 mm NaCl for 24 h. A, Expression of TPX1 (dark brown) in the apical zone of the root (last 0.5 cm from the root tip). B, Detail of A showing that the expression is completely abolished in the endodermis and protoxylem after NaCl treatment. C, Expression of TPX1 (purple) in the medium zone of the root (8–10 cm from the root tip). D, Detail of C showing TPX1 expression in the endodermis (En). E, Expression of TPX1 in the basal zone of the root (13–15 cm from the root tip). F, Detail of E revealing that TPX1 expression is limited to the endodermis (En).