Time-course of Cd desorption from roots of durum wheat seedlings. Time-course of Cd desorption from intact roots of a low (TL-L) Cd-accumulating isoline of durum wheat. Roots of 6-d old seedlings were exposed for 30 min to 15 mL of complete nutrient solution containing 50 pM 109Cd or 0.5 μM Cd (labelled with 109Cd). Roots were desorbed in non-radiolabelled nutrient solution containing 50 μM DTPA for up to 60 min (2°C) prior to harvest. Inset shows Cd remaining in the roots as a percentage of Cd accumulation prior to desorption (0 min). Means and standard errors of 5 replicates (3 plants per replicate) are plotted.