Figure 8.

¹⁰⁹Cd transport in xylem sap of durum wheat seedlings. Time-course of ¹⁰⁹Cd concentration in xylem sap (A) and the rate of xylem sap exudation (B) of high (TL-H) and low (TL-L) Cd-accumulating isolines of durum wheat. Roots of 6-d old seedlings were exposed for between 12 and 60 h in 15 mL of complete nutrient solution containing 25 pM ¹⁰⁹Cd (solutions changed every 12 h). Shoots were then excised 5–7 mm above the roots and xylem sap collected for 6 h. Means and standard errors of 10 replicates are plotted.