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| Effects of foliar application of silicon on uptake and transport of inorganic and methyl arsenic in rice |
| Received:May 30, 2018 |
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| KeyWord:foliar application of silicon;arsenic species;rice |
| Author Name | Affiliation | E-mail | | ZHANG Shi-jie | College of Resources and Environmental Sciences, Agricultural University of Hebei, Key Laboratory of Ecological Environment of Farmland in Hebei Province, Baoding 071000, China | | | FU Jie | College of Resources and Environmental Sciences, Agricultural University of Hebei, Key Laboratory of Ecological Environment of Farmland in Hebei Province, Baoding 071000, China | | | WANG Xiao-mei | College of Resources and Environmental Sciences, Agricultural University of Hebei, Key Laboratory of Ecological Environment of Farmland in Hebei Province, Baoding 071000, China | | | HE Di | College of Resources and Environmental Sciences, Agricultural University of Hebei, Key Laboratory of Ecological Environment of Farmland in Hebei Province, Baoding 071000, China | | | XUE Pei-ying | College of Resources and Environmental Sciences, Agricultural University of Hebei, Key Laboratory of Ecological Environment of Farmland in Hebei Province, Baoding 071000, China | | | LIU Wen-ju | College of Resources and Environmental Sciences, Agricultural University of Hebei, Key Laboratory of Ecological Environment of Farmland in Hebei Province, Baoding 071000, China | liuwj@hebau.edu.cn |
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| Abstract: |
| In order to investigate the effect of foliar application of silicon on the uptake of different species of arsenic in rice, the hydroponic experiment was conducted using rice seedlings sprayed with Si solution and exposed to nutrient solution with As(Ⅲ), As(V), MMA(V) and DMA(V) respectively and high performance liquid chromatography hydride generation atomic fluorescence spectrometry (HPLC-HG-AFS). The results showed that foliar application of silicon reduced the arsenic concentrations in rice roots and shoots for 4 arsenic species exposure. With As(Ⅴ) and MMA(Ⅴ) treatments, the arsenic concentrations in rice root was significantly lower than that of the control, accounting for 26.16% and 35.32%, respectively(P<0.05). Meanwhile, the foliar application of Si significantly decreased arsenic concentrations in rice shoots by 23.03% and 42.98%(P<0.05) for treatments with As(Ⅲ) and As(Ⅴ), respectively. In addition, foliar application of silicon can reduce arsenic uptake by rice. For As(Ⅴ) and MMA(Ⅴ) treatments, arsenic uptake of rice seedlings with foliar application of silicon was significantly lower than that of the control, accounting for 29.08% and 35.17% respectively(P<0.05). In general, foliar application of silicon could reduce the levels of different arsenic species in rice plants. As(Ⅲ) is the predominant species of arsenic in rice root and shoot for As(Ⅴ) treatment, and foliar application of silicon decreased the levels of As(Ⅲ) in rice shoots by 32.60%(P<0.05). For As(Ⅴ) and MMA(Ⅴ) treatments, the concentrations of As(Ⅴ) and MMA(Ⅴ) in rice roots were decreased by Si application for 55.30% and 30.61% respectively. However, the foliar application of Si did not impact the translocation of different arsenic species in rice plants. In summary, foliar application of silicon could inhibit the uptake and accumulation of different species of arsenic in rice and reduce arsenic toxicity to rice seedlings. |
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