Characterization of Lead Uptake and Accumulation Among Different Genotypes in Radish (Raphanus Sativus L.)

To elucidate the differences in tolerance and uptake of lead (Pb) among various genotypes in radish (Raphanus sativus L.), eight advanced inbred lines were grown in half-strength Hoagland's nutrient solution with 0, 100, 400, 800 mg L-1 Pb(NO3)(2), respectively. The results showed that the dry weight (DW) of shoot and root were significantly decreased with the increasing of Pb concentrations, indicating that the lead has significant effect on inhibiting growth of different radish genotypes. The lead content in whole plant increased with Pb concentration elevating in the nutrient solution. Among the eight genotypes, lead concentration in shoot varied from 0.13 to 110.68 mg kg(-1), while that in root ranged from 0.67 to 14511.18mg kg(-1). The concentration of lead in root was much higher than that in shoot under various lead treatments, indicating that the lead accumulation in radish was mainly in root. Moreover, significant differences of Pb accumulation were observed among different radish genotypes. The 'Nau-Zdcb05' and 'Nau-Dy05' accumulated more lead than the other genotypes, while relatively less lead was accumulated in 'Nau-Rg05' and 'Nau-Yh05'. In addition, the significantly negative relation was found between root Pb concentration and DW of root and shoot, which is in contrast to the relation between shoot lead concentration and DW of root and shoot.