Genotypic Differences of Cd Uptake and Distribution in Radish (Raphanus Sativus L.)

The genetic variability in uptake and distribution of cadmium (Cd) in 46 inbred lines of radish (Raphanus sativus L.) were investigated. The seedlings were cultivated for 10 days in nutrient solution with 50 mg L1 CdCl2 2.5H20. The results showed that there was significant genotypic variation existed in radish with regards to Cd concentrations. The Cd content in the roots ranged from 216.57 to 1419.20 mug g^-1 dry weight (DW), and the Cd content in the shoots ranged from 68.22 to 260.50 mug g^-1 DW. The genotypes 6 (Nau-Hm), 28 (Nau-CW20) and 2 (Nau-Njh) with red root skin were shown to be relatively lower root Cd concentrations, and higher translocation rates from roots to shoots than those of other cultivars. This variability indicated that the development of novel elite cultivar characterized by low content of Cd in root should be feasible in the radish breeding programs.