Elemental Cd in roots (a) and shoots (b) of Triticum turgidum cv. Arcola (filled triangles) and Kyle (open triangles) that had been exposed continuously to elemental Cd prior to the study. Each symbol is a mean value of the observed transpiration rate and the concomitant Cd concentration; the horizontal standard error (SE) bar is for transpiration, and the vertical SE bar is for Cd concentration.