Assessment of potential dietary toxicity and arsenic accumulation in two contrasting rice genotypes: Effect of soil amendments
| Autor: | Samra Irem, Franciscus Johannes Maria Maathuis, Tingqiang Li, Ejazul Islam, Nabeel Khan Niazi |
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| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Genotype Health Toxicology and Mutagenesis 0208 environmental biotechnology Amendment Biomass chemistry.chemical_element 02 engineering and technology 010501 environmental sciences complex mixtures 01 natural sciences Arsenic Soil chemistry.chemical_compound Soil Pollutants Environmental Chemistry 0105 earth and related environmental sciences Public Health Environmental and Occupational Health food and beverages Oryza General Medicine General Chemistry Contamination Phosphate Pollution Diet 020801 environmental engineering Soil conditioner Arsenic contamination of groundwater Iron sulfate chemistry Agronomy |
| Zdroj: | Chemosphere. 225:104-114 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2019.02.202 |
| Popis: | High concentration of arsenic (As) in rice is a serious problem worldwide. Pot experiments were conducted to assess the potential dietary toxicity of arsenic and effect of various soil amendments on arsenic accumulation in rice grains. Two basmati rice genotypes were used to conduct pot experiments using various levels of arsenic (10, 25, 50 and 100 mg kg−1 soil). In addition, plants were exposed to soil collected from a well documented arsenic contaminated site. Contrasting results for growth, yield and grain arsenic concentration were obtained for basmati-385 (Bas-385), exhibiting tolerance (56% yield improvement at 10 mg As kg−1), while genotype BR-1 showed 18% yield decline under same conditions. Furthermore, application of soil amendments such as iron (Fe), phosphate (PO4) and farmyard manure (FYM) at 50 mg kg−1, 80 kg ha−1 and 10 t ha−1, respectively improved the plant height and biomass in both genotypes. Accumulation of arsenic in rice grain followed a linear trend in BR-1 whereas a parabolic relationship was observed in Bas-385. Both genotypes exhibited a positive response to iron sulfate amendment with significant reduction in grain arsenic concentrations. Regression analysis gave soil arsenic threshold values of 12 mg kg−1 in Bas-385 and 10 mg kg−1 in BR-1 for potential dietary toxicity. This study suggests that genotype Bas-385 can be used for safe rice production in areas with soil arsenic contamination up to 12 mg kg−1 and that appropriate dose of iron sulfate for soil amendment can be used effectively to reduce translocation of arsenic to rice grain. |
| Databáze: | OpenAIRE |
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