Korean Journal of Soil Science and Fertilizer ISSN:0367-6315(Print) 2288-2162(Online) 한국토양비료학회 학회지

Cadmium (Cd) uptake and accumulation from soil to plant vary depending on the environment conditions. Here, we studied the chemical properties of Cd-treated soils, the growth-inhibition rates of Cd-exposed oilseed rape plants, the changes in Cd content of soil, and the relationship between Cd bioconcentration factor and Cd accumulation from the soil to oilseed rape organs. Oilseed rape plants were cultivated in a greenhouse under four Cd treatments: 0 (control), 4, 8, and 12 mg kg^-1. A significant positive correlation was found between Cd concentration and available P₂O₅ or exchangeable K. The Cd concentration for 25% shoot growth inhibition (GR₇₅) was 8 mg kg^-1. Cd content in the root and shoot was positively correlated in the flowering stage of oilseed rape. Bioconcentration factor (BCF)_root/soil decreased with Cd concentration and Cd accumulation in the 8 mg kg_-1 treatment was higher at flowering stage. Cd accumulation was related to plant biomass and soil Cd concentration. We found that Cd accumulation would be much greater in Cd concentrations that allowed plant growth and development. Thus, a species-specific threshold concentration must be determined based on Cd phytotoxicity for phytoremediation of Cd-contaminated soils.

Cd bioconcentration factors between soil and root or shoot (A) and Cd accumulations in roots and shoots of oilseed rape plants at flowering stage (B), and comparison of the bioconcentration factors between root and shoot tissues (figures at top of the columns).