Effect of La~(2+) on the Growth of Allium sativum L.andCadmium Accumulation under Cd Stress

The effects of La2+ on the growth of Allium sativum L.and Cadmium(Cd) accumulation under Cd stress were studied in the present paper by soil cultivation experiments.The results showed that the seedlings growth of A.sativum L.could be promoted a little under low concentration of Cd(5mg·kg-1),while the seedlings growth could be obviously inhibited under high concentration of Cd.When La2+(concentration range from 5 to 20mg·kg-1) was exerted on A.sativum L.seedlings under high concentration Cd stress one time,the growth of seedlings was obviously reconditioned,Their average fresh or dry weight and the average length of roots,overground height significantly increased to some certain degree.Assay results also showed the roots of A.sativum L.absorbed large amounts of Cd,the Cd accumulated mainly in the roots and small amounts of Cd were translocated to the leaves.Accumulation of Cd of seedlings roots and translocation of Cd to overground part were obviously inhibited when La2+ was exerted on A.sativum L.seedlings.According to the growth of A.sativum L.and Cd accumulation of seedlings under high concentration Cd stress when La2+ was exerted on seedlings,valid concentration of La2+ was respectively 10～15mg·kg-1 or 5mg·kg-1 when Cd stress concentration was 20 or 40mg·kg-1.