| 张世杰,付洁,王晓美,何迪,薛培英,刘文菊.叶面施硅对水稻吸收和转运无机砷和甲基砷的影响[J].农业环境科学学报,2018,37(7):1529-1536. |
| 叶面施硅对水稻吸收和转运无机砷和甲基砷的影响 |
| Effects of foliar application of silicon on uptake and transport of inorganic and methyl arsenic in rice |
| 投稿时间：2018-05-30 |
| DOI：10.11654/jaes.2018-0713 |
| 中文关键词: 叶面施硅 砷形态 水稻 |
| 英文关键词: foliar application of silicon arsenic species rice |
| 基金项目:国家自然科学基金项目（41471398） |
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| 摘要点击次数: 1867 |
| 全文下载次数: 2035 |
| 中文摘要: |
| 为探讨叶面施硅对水稻吸收和转运不同形态砷[As （Ⅲ）、As （Ⅴ）、MMA （Ⅴ）和DMA （Ⅴ）]的影响，采用水培模式和高效液相-原子荧光光度计（HPLC-AFS）相结合的方法，探究了水稻幼苗叶面施硅后其吸收不同形态砷的能力及其体内不同形态砷含量的变化。结果表明：4种砷形态处理下，叶面施硅可降低水稻地上部和根部砷含量，其中As （Ⅴ）、MMA （Ⅴ）处理下，叶面施硅水稻根中砷含量显著低于对照，降幅分别为26.16%、35.32%（P<0.05），As （Ⅲ）和As （Ⅴ）处理下，叶面施硅后，水稻地上部砷浓度显著低于对照（P<0.05），降幅分别为23.03%和42.98%；叶面施硅处理还可降低水稻对砷的吸收能力，其中As （Ⅴ）、MMA （Ⅴ）处理下，叶面施硅水稻对砷的吸收显著低于对照，降幅分别为29.08%、35.17%（P<0.05）；此外，叶面施硅可以降低水稻地上部与根系砷形态含量，其中As （Ⅴ）处理下，叶面施硅的水稻地上部As （Ⅲ）含量比对照显著降低32.60%（P<0.05），As （Ⅴ）和MMA （Ⅴ）处理下，水稻根系As （Ⅴ）和MMA （Ⅴ）含量分别比对照显著降低55.30%和30.61%。但是，叶面施硅对不同形态砷在苗期水稻体内的转运没有显著影响。总之，叶面施硅可抑制水稻对不同形态砷的吸收与累积，在一定程度上降低水稻砷毒害。 |
| 英文摘要: |
| 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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