Institute of Botany, Slovak Academy of Sciences, Dúbravská cesta 9, SK-845 23 Bratislava, Slovakia.
Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina B2, SK-842 15 Bratislava, Slovakia.
Plant Physiol Biochem. 2014 Oct;83:279-84. doi: 10.1016/j.plaphy.2014.08.014. Epub 2014 Aug 27.
Pollution of antimony (Sb) raises a serious environmental problem. Although this non-essential element can be taken up by roots and accumulated in plant tissues in relatively high concentrations, there is still lack of knowledge about the effect of Sb on biochemical and metabolic processes in plants. It was shown that application of silicon (Si) can decrease the toxicity of other heavy metals and toxic elements in various plants. The aim of this study was to assess how Si influences the growth and antioxidative response of young Zea mays L. roots exposed to elevated concentrations of Sb. Antimony reduced the root growth and induced oxidative stress and activated antioxidant defense mechanisms in maize. Silicon addition to Sb treated roots decreased oxidative stress symptoms documented by lower lipid peroxidation, proline accumulation, and decreased activity of antioxidative enzymes (ascorbate peroxidase, EC 1.11.1.11; catalase, EC 1.11.1.6; and guaiacol peroxidase, EC 1.11.1.7). Although neither positive nor negative effect of Si has been observed on root length and biomass, changes in the oxidative response of plants exposed to Sb indicate a possible mitigation role of Si on Sb toxicity in plants.
锑（Sb）污染引发了严重的环境问题。尽管这种非必需元素可以通过根部吸收并在植物组织中积累到相对较高的浓度，但人们对 Sb 对植物生化和代谢过程的影响仍缺乏了解。研究表明，硅（Si）的应用可以降低其他重金属和有毒元素在各种植物中的毒性。本研究旨在评估 Si 如何影响暴露于 Sb 升高浓度下的幼期玉米（Zea mays L.）根的生长和抗氧化反应。Sb 降低了根的生长，并诱导了玉米的氧化应激和激活抗氧化防御机制。向 Sb 处理的根中添加 Si 减少了氧化应激症状，表现为脂质过氧化、脯氨酸积累和抗氧化酶（抗坏血酸过氧化物酶，EC 1.11.1.11；过氧化氢酶，EC 1.11.1.6；和愈创木酚过氧化物酶，EC 1.11.1.7）活性降低。尽管 Si 对根长和生物量没有观察到正或负的影响，但 Sb 暴露下植物氧化反应的变化表明 Si 对植物 Sb 毒性可能具有缓解作用。
