| Antimony(Sb) is a widespread environmental contaminant. Sb-contaminated soils, sediments and water bodies are major sources of Sb contamination in food chains. A recent risk analysis suggests that consumption of rice with elevated Antimony may cause health problems, and the Antimony pollution of food has become a major public concern in many countries in recent years. Decontamination of Sb polluted soils has also become a major environmental concern around the globe, particularly in Southeast Asia. Unfortunately, there are currently no effective countermeasures to reduce the risks associated with soil Sb contamination. Therefore, seeking an effective method for reducing the antimony risk to human health through food chain is imminent.Silica, boron and calcium is a necessary element for good rice growth,addition silicon and boron and calcium fertilizer not only can increase production, and can significantly improve the resilience of crop under various stress conditions.This paper focuses on silica, boron and calcium uptake of rice Sb(V) and Sb(III), degree of role and the possible mechanism?The research about this field is not much at home and abroad, which is the main research in this issues.In this study, Hydroponic experiment was conducted to research effects of silicon boron and calcium on antimony uptake by rice plants(Oryza sativa) and possible mechanisms.The main research of this paper is as follows:(1) Sb(III) and Sb(Ⅴ) could inhibit rice growth and influence rice biomass, Sb(III) was more toxic than Sb(Ⅴ). The addition of 1.0 and 2.0mmol·L-1 Si hadn’t significantly increase rice biomass,Increase the dosage of B can alleviate the poisoning of Sb on rice, especially for Sb(III) treatment is more obvious to effect of rice poison relief. Add a low concentration(5mmol·L-1) Ca influence on rice biomass did not reach significant level,but add a high concentration of Ca(20mmol·L-1) can significantly improve the rice leaf and root dry weight by 26.5% and 42.9%,respectively,compare with the control.(2) Concentrations of Si,B and Ca in rice roots and shoots were significantly affected by the addition of Sb(Ⅲ) and Sb(Ⅴ).The addition of 30μmol·L-1 Sb(III)and Sb(Ⅴ) could significantly decreased Si of rice roots by 52.2% and 23.5%,and rice shoots by 52.2% and 23.5%,under 1.0mmol·L-1 Si;Ca of rice shoots by 49.4%,but Sb(Ⅴ) treatment could significantly increase Ca of roots by 50.4% and shoots 26.2%,under 5.0mmol·L-1 Ca, respectively,compared with the control.The addition of 30μmol·L-1 Sb(III) could decrease B of rice shoots and roots by 57.6%and 75.6%,respectively.(3) Adding Si,B and Ca also significantly decreased rice roots and shoots Sb(Ⅲ) and Sb(Ⅴ) concentration.The addition of 1.0 and 2.0mmol·L-1 Si could decreased the concentration of Sb in rice roots and shoots by 52.0-88.4% and 24.6-45.4%, under 10μmol·L-1Sb(III),29.3-67.2% and 19.4-24.0%,under 30μmol·L-1Sb(III); 53.8-75.5% and 34.8-49.6%,under 10μmol·L-1 Sb(Ⅴ),75.1-85.1% and 25.3-58.8%,under 30μmol·L-1 Sb(Ⅴ), respectively,compared with the control.The Sb concentration of rice roots were signifi- cantly reduce with the increase of concentration of B, but the Sb of rice shoots changed with the increase of the concentration of B,The addition of 5.0 and 20mmol·L-1 Ca could decreased the concentration of Sb in rice roots and shoots by37.8-73.8% and 38.0%-49.6%,under 10μmol·L-1 Sb(III),19.0%-79.4% and 42.6%- 71.8%,under 30μmol·L-1 Sb(III);not-72.3% and 54.8%-92.5%,under 10μmol·L-1 Sb(Ⅴ); 34.3 %- 70.6% and 74.1%- 84.6%under 30μmol·L-1Sb(Ⅴ)。Preliminary study shows that silicon and boron and calcium inhibits rice absorption mechanism of antimony may be due to the department of transport to the ground stage Sb and compete between Si and B and Ca transshipment,Thereby reducing the rice plant absorption and accumulation of antimony. |
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