Physiological response of Medicago sativa to cadmium stress and accumulation property

The physiological response of Medicago sativa to cadmium stress and accumulation property were studied with pot experiment.The results showed that the growth of M. sativa was promoted when the concentration of Cd less than 25 mg·kg-1. With the increased concentration of Cd in the medium, relative conductivity chlorophyll contents all decreased, proline contents increased first, then decreased, and reached the highest at Cd level of 25 mg·kg-1. The distribution of Cd in M. sativa was root＞shoot. With the increased concentration of Cd in the medium, Cd content in shoot and root increased, translocation factor and tolerance factor increased first,then decreased. When the concentration of Cd were 25 and 100 mg·kg-1, the Cd content were reached the highest in shoot and root which were 42.5 and 26.11 μg per pot， respectively. It could be concluded that M. sativa was suitable for remediation of Cd polluted soil when Cd concentration was less than 25 mg·kg-1.