Institute of General Ecology and Environmental Protection, Technische Universität Dresden, D-01062 Dresden, Germany.
Sci Total Environ. 2013 Jan 1;442:6-9. doi: 10.1016/j.scitotenv.2012.10.016. Epub 2012 Nov 21.
Silicon is described as beneficial for grasses by enhancing yield and fitness via a considerable contribution to pathogen, drought, and pest resistance. Silicic acid is the predominant form for uptake and transport within the plant and will precipitate in leaves. But it is unknown whether polymeric nanosilicon compounds in its synthetic form, with an increasing concentration in aquatic environments, can be suitable for plant nutrition. Therefore, we investigated the uptake, transport, and deposition of silicic acid/silica within plants using synthetic nanosilica. Our results show a significant difference in silicon (Si) content within the different tissues of Phragmites australis. The nanosilica had been dissolved prior to the uptake by plants. The chemical form of Si during uptake was not traceable. A significant enhancement in the condensation state of the silica was found from root to leaves especially from culm to leaf tips visible by the increasing content of Q(4)-groups in the NMR spectra. We conclude that synthetic nanosilica has the same quality as source for the beneficial element Si like natural silica. Since the condensation state is described to control silica solubility, we suggest that different condensation states within the plant may result in different remobilization of silicon during decomposition of the plant material.
硅被描述为通过对病原体、干旱和害虫的抵抗力的显著贡献来提高产量和适应性，从而对草有益。硅酸是植物吸收和运输的主要形式，会在叶子中沉淀。但目前尚不清楚其合成形式的聚合纳米硅化合物，随着其在水生环境中浓度的增加，是否适合植物营养。因此，我们使用合成纳米硅研究了硅酸/二氧化硅在植物中的吸收、运输和沉积。我们的结果表明，不同组织的芦苇中的硅（Si）含量存在显著差异。纳米硅在被植物吸收之前已经溶解。在吸收过程中，硅的化学形式无法追踪。通过核磁共振（NMR）光谱中 Q(4)-基团含量的增加，可以发现从根部到叶子，特别是从秆到叶尖，二氧化硅的凝聚状态显著增强。我们得出结论，合成纳米硅与天然二氧化硅一样，是有益元素硅的来源。由于凝聚状态被描述为控制二氧化硅的溶解度，我们建议在植物分解过程中，不同的凝聚状态可能导致硅的不同再移动。
