Journal
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
Volume 82, Issue 3, Pages 226-232Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.pestbp.2005.03.002
Keywords
atrazine; mercury; rice seedlings; uptake; contamination
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The uptake of atrazine (ATR) by rice seedlings (Oryza sativa L.) from nutrient solution was investigated in the presence and absence of Hg2+ over a period of 96h. Either ATR or Hg2+ was found phytotoxic to rice seedlings, as they inhibited the seedling growth. The seedlings showed about 50% biomass reduction when exposed to 1.0 mg/L Hg2+ alone in nutrient solution, and about 80% reduction when exposed to 12.Omg/L ATR alone. Observed ATR and Hg2+ levels (in mg/kg) in seedlings are not related to biomass changes. When either ATR or Hg2+ was applied, the concentrations in seedlings increased largely in proportion to those in nutrient solution. The presence of Hg2+ at 0.1 and 1.0 mg/L in solution caused a small-to- moderate decline in ATR uptake by the seedlings, the effect being largely independent of the ATR concentration in nutrient solution (at 6.0 and 12.0 mg/L). The presence of ATR (at 6.0 and 12.0 mg/L) in the nutrient solution led to small-to-moderate irregular changes in the Hg2+ concentrations in rice seedlings. The overall results showed that there was no significant interdependence between the uptakes of ATR and Hg2+ by rice seedlings, which is in contrast to the enhanced ATR uptake noticed earlier with Pb2+ ion. Plant uptake of non-ionic organic compounds, such as ATR may be partly through water channels on the plasma membranes of plant cells. (c) 2005 Elsevier Inc. All rights reserved.
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