Fig. 1.

Net Cd²⁺ flux profiles along the root axis of cultivar IR8. Net Cd²⁺ fluxes were measured after 1 h exposure to 20 µM CdCl₂ with 0.1 mm increments between 0 mm and 1 mm, 0.5 mm increments between 1 mm and 10 mm, and 1.0 mm increments between 10 mm and 20 mm, starting from the root cap. The insert displays the close-up view of net Cd²⁺ flux along the root segment between 0 mm and 1 mm. At each position, an average Cd²⁺ flux was measured for 1 min before the electrode was repositioned. Data are means ±SE (n=5). For all MIFE data, the sign convention is ‘influx positive’.