Cadmium Accumulation Characteristics of Cyphomandra betacea Seedlings

摘要

A pot experiment was conducted to study the accumulation characteristics of cadmium (Cd) in Cyphomandra betacea Seedlings. The annual C. betacea seedlings were treated with Cd of different concentration gradients (0 - 20 mg/kg). The results showed that with the increase of soil Cd concentration, the root biomass, stem biomass, leaf biomass and shoot biomass of C. betacea seedlings tended to decrease, without showing obvious toxic symptoms. When the soil Cd concentration was less than 5 mg/kg, the distribution of Cd in C. betacea seedlings was as follows: root > stem > shoot > leaf, when the Cd concentration in soil was more than 5 mg/kg, the order of Cd content in the organs of C. Betacea seedlings was: root > leaf > shoot > stem. With the increase of soil Cd concentration, the Cd content in C. betacea seedlings increased evidently, when the soil Cd concentration reached 20 mg/kg, the Cd content in the roots was 168.86 mg/kg, and 8.08 mg/kg in the shoots respectively. For the translocation factor (TF), the results showed that the TF of C. Betacea seedlings decreased first and then increased, and the TF of different soil Cd concentration was less than 0.3. Therefore, with Cd accumulated mainly in the roots, C. betacea seedlings had a strong tolerance to Cd stress.