Effect of Cadmium(Cd~(2+))on the development of cuttings of 4 arbor willow clones under water culture

We studied the root formation and shoot development of willow cuttings with the treatment of Cadmium(Cd~(2+))under water culture.With the treatment,rooting time delayed(rooting times of clones J172,J799 are 7.3,8.0 d respectively at Cd~(2+) 0,but are 20.2,21.5 d respectively at Cd~(2+) 50×10~(-6));root elongation was inhibited(root average lengths of clones J172,J799,J795,J1011 are 3.24,3.38,4.23,4.54 cm respectively at CK,but are 0.37,0.58,0.0,0.0 cm respectively at Cd~(2+) 50×10~(-6)),root number and root fresh weight were decreased under high Cd~(2+) concentration whereas increased or had no change under medium or low Cd~(2+) concentration.The shoot length and fresh weight were decreased.The treatment has little effect on rooting ratio,sprouting ratio and sprouting time.Willow cuttings developed normally with Cd~(2+) concentration not greater than 20×10~(-6).Willow clone J172(Salix×jiangsuensis CL.'172')has great potential in Cd~(2+) phytoremediation.