Figure 1.

Time course of the effect of Ni exposure on Ni and His concentrations in the xylem sap of A. lesbiacum. Values are arithmetic means ± sd of n = 3 replicates. The hydroponic root medium of 8-week-old plants was supplemented with 300 μm Ni for between 0 and 8 h. Subsequently, the shoots were cut off to collect xylem sap as root pressure exudates for 5 h, while Ni exposure continued. Each replicate value corresponds to pooled xylem sap from three plants in one culture vessel. Data are from one experiment representative of a total of two independent experiments, with three replicate culture vessels per treatment in each experiment.