Identification of Cu(OH)<+> toxicity to barley root elongation in culture solution with a wide range of pHs
The effect of pH on acute copper toxicity to barley was investigated using root elongation in culture solutions with different pHs. In the range of pH 4.54-5.82, EC50s for free copper ion activity was found to be 2×10<-5> mol, while in the range of pH 6.4-8.03, EC50s for free copper ion activity decreased from 7.94×10<6> mol to 6.19×10<-8> mol with pH increase. This result disaccorded with the conclusion of only H<+> competition can decreasing copper toxicity with pH decrease based on Biotic Ligand Model (BLM) theory, and the increased toxicity with increasing solution pH may as not so much due to decreasing H<+> competition at the biotic ligand sites but rather to the increased other copper toxic species. When we take account of Cu(OH)<+>, all toxicity data were fitted very well in BLM. Thus, the results showed that effects of pH on copper toxicity to barley need to consider Cu(OH)<+> in high pH range and the species of Cu(OH)<+> is toxic to barley root elongation.
copper Biotic Ligand Model BLM toxicity barley
X. D. Wang Y. B. Ma L. Hua X. Zhang D. P. Wei
Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, The Key Lab of Resource Environment and GIS, College of Resource Environment & Tourism, Capital Norm
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
675-676
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）