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| Effects of P, Fe and water supply on arsenic availability in soil and accumulation in wheat seedlings |
| Received:September 13, 2017 |
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| KeyWord:arsenic;availability;phosphate;iron;wheat |
| Author Name | Affiliation | E-mail | | LI Si-yan | College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | SHI Gao-ling | Institute of Food Crops, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | LOU Lai-qing | College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China | Loulq@njau.edu.cn | | CAI Qing-sheng | College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China | |
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| Abstract: |
| In this study, we investigated the effects of exogenous phosphate(P), iron(Fe) and water supply on arsenic(As) availability in soil and its accumulation in the shoots of wheat(Triticum aestivum L.) seedlings. The Fe supplement resulted in a significant reduction of As available for uptake by plants, including specifically and non-specifically sorbed As in soil, which might be attributed to the decrease of As accumulation in the shoots of wheat plants. On the contrary, phosphate application led to the opposite effect, showing a dramatic increase in the As concentration in the soil solution and As uptake in the wheat shoots. Among the treatments with various forms of phosphate, a significant difference in the As concentration in the soil solution was detected. However, no change was observed in the As concentration in various fractionations of the soil. This change in the As concentration in the soil solution by different forms of phosphate did not correspond to the variation in As accumulation in wheat shoots. Various water supplies to the soil could not alter the As concentration in the soil solution and wheat shoots, as well as the soil pH. Correlation analysis suggested that the As concentrations in wheat shoots were positively correlated with the As in soil solution and specifically sorbed As in soil, while being negatively correlated with dry biomass, amorphous Fe and Al oxides-bound, and, crystalline Fe and Al oxides-bound As in soil(P<0.05). Additionally, the shoot biomass was significantly positively correlated with the specifically sorbed and amorphous Fe and Al oxides-bound As concentrations in soil(P<0.05). Considered together, our data indicates that the exogenous supplement of Fe and P alters the As concentration in the soil solution and specifically sorbed As in soil, which in turn positively affect the As accumulation in wheat shoots. |
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