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| Effects of arsenic on wheat seedling growth and corresponding agronomic measures for toxicity mitigation |
| Received:December 21, 2021 |
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| KeyWord:wheat;arsenic;absorption;accumulation;toxicity;fertilizer application |
| Author Name | Affiliation | E-mail | | MA Rui | School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China | | | WANG Haifang | School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China | | | LU Jing | School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China | lujing1982@163.com | | Lü Pu | School of Environment, Tsinghua University, Beijing 100084, China | | | LI Jinhui | School of Environment, Tsinghua University, Beijing 100084, China | |
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| Abstract: |
| In this study, the absorption and accumulation abilities of roots and shoots and the toxic effects of arsenic(As)on wheat seedlings(Triticum aestivum L.)were explored to evaluate the influence of As pollution. In addition, related toxicity mitigation agronomic measures were proposed. Two varieties of wheat(Jinmai No.1 and Jinmai No.2)were selected as test plants, and the hydroponic method was used in a part of the experiment. Silicate(Si)and phosphate(P)fertilizers were applied separately to study the differences in root and shoot biomass and As accumulation. The semi-inhibitory concentration of As(Ⅲ)in the root biomass for Jinmai No.1 and No.2 were 1.2 μmol· L-1 and 2.2 μmol·L-1, respectively. The physiological oxidative stress caused by As(Ⅲ)was more significant in Jinmai No.1 than in Jinmai No.2. As(Ⅲ)showed no obvious toxicity. Compared to that in Jinmai No.1, more As was absorbed in the roots and shoots and transported to the aboveground foliage of Jinmai No.2, which indicates a higher human health risk. In addition, the application of Si and P effectively increased the biomass of roots and shoots and led to a significant reduction in As accumulation in the roots and shoots. Accumulated concentrations of As in the roots and shoots of wheat seedlings decreased by 77.4% and 60.5%, and 67.6% and 49.2% for the 200 mg·kg-1 Si and 100 mg · kg-1 P addition groups, respectively. Therefore, the absorption, transportation, and accumulation abilities of As and the oxidative stress caused by As differ between the two wheat varieties, and there are differences in the arsenic tolerance between the two wheat seedlings. The application of Si and P is an effective agronomic practice for reducing As concentration in various tissues of wheat. |
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