1. Is the effect of silicon on rice uptake of arsenate (AsV) related to internal silicon concentrations, iron plaque and phosphate nutrition?
- Author
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Guo W, Zhu YG, Liu WJ, Liang YC, Geng CN, and Wang SG
- Subjects
- Arsenates analysis, Arsenates toxicity, Fertilizers adverse effects, Fertilizers analysis, Iron chemistry, Phosphates analysis, Phosphates metabolism, Plant Roots chemistry, Plant Roots drug effects, Plant Shoots chemistry, Plant Shoots drug effects, Water Pollutants, Chemical analysis, Water Pollutants, Chemical toxicity, Arsenates metabolism, Environmental Pollution adverse effects, Food Contamination prevention & control, Oryza metabolism, Silicon metabolism, Water Pollutants, Chemical metabolism
- Abstract
Solution culture experiments were conducted to investigate the effects of silicon (Si) on arsenate (As(V)) uptake by rice. The addition of Si to the pretreatment or uptake solution significantly decreased shoot and root As concentrations (P<0.001 and P<0.05). The presence of Si in the pretreatment or uptake solution also significantly decreased shoot P concentrations (P<0.001). The data demonstrated that both internal and external Si inhibited the uptake of As and P. Results of As uptake kinetics showed that the mechanism of the effect of Si on arsenate uptake is not caused by direct competition for active sites of transporters with As. The effect of Si on As uptake was not entirely mediated through the effect of Si on P uptake. Although the addition of Si to pretreatment solutions still significantly decreased shoot and root As concentrations, the extent of reduction became smaller when rice roots were coated with iron plaque.
- Published
- 2007
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