Fig. 4.

Schematic illustration of the longitudinal section of a mature rice stem and crown root. ¹⁰⁹Cd was supplied to a mature rice plant through one crown root for 30min (shown at lower left). The shoot was then sliced into sections at the incision lines (A–R) to trace the ¹⁰⁹Cd transport pathway inside the stem. The areas between the central cavities are the nodes. CC, central cavity; CR, crown root; LB, large vascular bundles; LSB, laterally running small vascular bundles; NV, nodal vascular anastomoses; PV, peripheral cylinder of longitudinal vascular bundles; VSB, vertically running small vascular bundles.