Growth-inhibition Patterns and Bioconcentration Profiles in Cadmium-stressed Oilseed Rape (Brassica napus L.)
2018
Jung, H.I., , National Institute of Agricultural Science, RDA, Wanju, Republic of Korea | Kong, M.S., , National Institute of Agricultural Science, RDA, Wanju, Republic of Korea | Lee, E.J., , National Institute of Agricultural Science, RDA, Wanju, Republic of Korea | Jung, G.B., , National Institute of Agricultural Science, RDA, Wanju, Republic of Korea | Kim, Y.H., , National Institute of Agricultural Science, RDA, Wanju, Republic of Korea
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 (GR∧75) 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.
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