Figure 1. Growth development of S. integra exposed to different Pb concentrations for 14 days and metal related symptoms in roots and leaves.

(A) Growth of S. integra after exposure to 0, 47, 123, 178, and 196 µM of Pb treatments for 14 days. (B) Leaf symptoms of three varieties under different Pb treatments for 14 days. T1, T2, T3 and T4 represent 47, 123, 178, and 196 µM of Pb respectively. (C) Root systems of willows grown in the control. (D) Root systems of willows grown under 196 µM Pb treatment.