Toxic arsenic(As)and trace element selenium(Se)are transformed by microorganisms but their complex interactions in soil-plant systems have not been fully understood.An Asand Se-oxidizing bacterium,Agrobacterium sp.T3F...Toxic arsenic(As)and trace element selenium(Se)are transformed by microorganisms but their complex interactions in soil-plant systems have not been fully understood.An Asand Se-oxidizing bacterium,Agrobacterium sp.T3F4,was applied to a native seleniferous As-polluted soil to investigate As/Se uptake by the vegetable Brassica rapa L.and As-Se interaction as mediated by strain T3F4.The Se content in the aboveground plants was significantly enhanced by 34.1%,but the As content was significantly decreased by 20.5% in the T3F4-inoculated pot culture compared to the control(P<0.05).Similar result was shown in treatment with additional 5 mg/kg of Se(IV)in soil.In addition,the As contents in roots were significantly decreased by more than 35% under T3F4 or Se(IV)treatments(P<0.05).Analysis of As-Se-bacterium interaction in a soil simulation experiment showed that the bioavailability of Se significantly increased and As was immobilized with the addition of the T3F4strain(P<0.05).Furthermore,an As/Se co-exposure hydroponic experiment demonstrated that As uptake and accumulation in plants was reduced by increasing Se(IV)concentrations.The 50% growth inhibition concentration(IC50)values for As in plants were increased about one-fold and two-fold under co-exposure with 5 and 10μmol/L Se(IV),respectively.In conclusion,strain T3F4 improves Se uptake but decreases As uptake by plants via oxidation of As and Se,resulting in decrease of soil As bioavailability and As/Se competitive absorption by plants.This provides a potential bioremediation strategy for Se biofortification and As immobilization in As-polluted soil.展开更多
A new 1D infinite neutral chain （Ph3SnO2SeOCH2CH3）n （1） based on organotin and selenious acid monoethyl ester has been synthesized successfully and characterized by IR, elemental analysis, and X-ray single-crystal...A new 1D infinite neutral chain （Ph3SnO2SeOCH2CH3）n （1） based on organotin and selenious acid monoethyl ester has been synthesized successfully and characterized by IR, elemental analysis, and X-ray single-crystal diffraction. In the compound 1, the Sn atom exists in slightly distorted trigonal bipyramidal geometry and the Se center is tri-coordinated with a distorted pyramidal arrangement. It is noted that the synthesis is facile and selenium oxide is directly introduced into synthesis route replacing organoseleninic acid under room temperature.展开更多
基金supported by the National Natural Science Foundation of China(No.41771283)"Longyun Program"of the College of Life Science and Technology of Huazhong Agricultural University。
文摘Toxic arsenic(As)and trace element selenium(Se)are transformed by microorganisms but their complex interactions in soil-plant systems have not been fully understood.An Asand Se-oxidizing bacterium,Agrobacterium sp.T3F4,was applied to a native seleniferous As-polluted soil to investigate As/Se uptake by the vegetable Brassica rapa L.and As-Se interaction as mediated by strain T3F4.The Se content in the aboveground plants was significantly enhanced by 34.1%,but the As content was significantly decreased by 20.5% in the T3F4-inoculated pot culture compared to the control(P<0.05).Similar result was shown in treatment with additional 5 mg/kg of Se(IV)in soil.In addition,the As contents in roots were significantly decreased by more than 35% under T3F4 or Se(IV)treatments(P<0.05).Analysis of As-Se-bacterium interaction in a soil simulation experiment showed that the bioavailability of Se significantly increased and As was immobilized with the addition of the T3F4strain(P<0.05).Furthermore,an As/Se co-exposure hydroponic experiment demonstrated that As uptake and accumulation in plants was reduced by increasing Se(IV)concentrations.The 50% growth inhibition concentration(IC50)values for As in plants were increased about one-fold and two-fold under co-exposure with 5 and 10μmol/L Se(IV),respectively.In conclusion,strain T3F4 improves Se uptake but decreases As uptake by plants via oxidation of As and Se,resulting in decrease of soil As bioavailability and As/Se competitive absorption by plants.This provides a potential bioremediation strategy for Se biofortification and As immobilization in As-polluted soil.
基金supported by the National Natural Science Foundation of China(Nos.20671011,20731002)the 111 Project(No.B07012)+2 种基金Key Laboratory of Structural Chemistry Foundation(No.060017)Excellent Young Scholars Research Fund of Beijing Institute of Technology(No.2006Y0715)Basic Research Fund of Beijing Institute of Technology(Nos.20060742022,20070742010).
文摘A new 1D infinite neutral chain （Ph3SnO2SeOCH2CH3）n （1） based on organotin and selenious acid monoethyl ester has been synthesized successfully and characterized by IR, elemental analysis, and X-ray single-crystal diffraction. In the compound 1, the Sn atom exists in slightly distorted trigonal bipyramidal geometry and the Se center is tri-coordinated with a distorted pyramidal arrangement. It is noted that the synthesis is facile and selenium oxide is directly introduced into synthesis route replacing organoseleninic acid under room temperature.
