Combined toxicity of copper and cadmium to six rice genotypes(Oryza sativa L.)
HUANG Yizong , HU Ying , LIU Yunxia
DOI:
Received May 22, 2008,Revised September 01, 2008, Accepted , Available online
Volume 21,2009,Pages 647-653
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Accumulations of copper (Cu) and cadmium (Cd) in six rice cultivars (94D-22, 94D-54, 94D-64, Gui630, YY-1, and KY1360) were
evaluated through exposure to heavy metal contamination (100 mg/kg Cu, 1.0 mg/kg Cd, and 100 mg/kg Cu + 1.0 mg/kg Cd) in a
greenhouse. The dry weights of shoot and root, concentrations of Cu and Cd in plant tissues and the Cu, Cd, P, Fe concentrations in
the root surface iron plaques were analyzed eight weeks later after treatment. The results indicated that the plant biomass was mainly
determined by rice genotypes, not Cu and Cd content in soil. Separated treatment with Cu/Cd increased each metal level in shoot, root
and iron plaques. Soil Cu enhanced Cd accumulation in tissues. In contrast, Cu concentrations in shoot and root was una ected by
soil Cd. Compared to single metal contamination, combined treatment increased Cd content by 110.6%, 77.0%, and 45.2% in shoot,
and by 112.7%, 51.2% and 18.4% in root for Gui630, YY-1, and KY1360, respectively. The content level of Cu or Cd in root surface
iron plaques was not a ected by their soil content. Cu promoted Fe accumulation in iron plaques, while Cd has no e ect on P and
Fe accumulation in it. The translocation of Cu and Cd from iron plaques to root and shoot was also discussed. These results might be
beneficial in selecting cultivars with low heavy metal accumulation and designing strategies for soil bioremediation.
