Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China.
Key Laboratory of Tropical Agro-Environment, Ministry of Agriculture, South China Agricultural University, Guangzhou 510642, China.
Int J Environ Res Public Health. 2019 May 9;16(9):1624. doi: 10.3390/ijerph16091624.
Silicon (Si) plays important roles in alleviating heavy metal stress, but the migrating effects and mechanisms, especially for , are not well studied. In this study, and × were used to explore the impacts of Si application on alleviating cadmium (Cd) toxicity and its possible mechanism. Treatments consist of four levels of Cd (0, 10, 50, and 100 mg·kg) with or without 2.0 mM Si amendments. Under Cd stress, Si application significantly increased plant biomass and Si content, reduced Cd content, and decreased the enrichment factor in shoots and roots. Si treatment also increased soil pH and soil residual Cd, while reducing available/oxidizable/reducible Cd content in soil at 50 and 100 mg·kg Cd levels, thereby leading to a reduction of the soil's available Cd. These findings indicate that Si application is effective in alleviating Cd phytotoxicity of , mainly through reducing plant Cd uptake and increasing soil pH and Cd immobilization, thereby reducing Cd bioavailability.
硅（Si）在缓解重金属胁迫方面起着重要作用，但对于 （ ）的迁移作用及其机制尚不清楚。本研究采用 （ ）和 （ ） × 来探讨施硅对缓解镉（Cd）毒害及其可能机制的影响。处理包括 4 个 Cd 水平（0、10、50 和 100mg·kg）和有无 2.0mM 硅添加。在 Cd 胁迫下，施硅显著增加了植株生物量和硅含量，降低了 Cd 含量和根、茎的富集系数。硅处理还增加了土壤 pH 值和土壤残留 Cd，同时降低了 50 和 100mg·kg Cd 水平下土壤中有效/可氧化/可还原 Cd 的含量，从而降低了土壤中有效 Cd 的含量。这些发现表明，硅的施用能有效缓解 （ ）的 Cd 毒性，主要是通过减少植物对 Cd 的吸收，增加土壤 pH 值和 Cd 的固定，从而降低 Cd 的生物有效性。
