Chengdu University of Technology, No. 218, Section 3, University City Road, Yibin City, 610059, China.
China College of Environmental Sciences, Sichuan Agricultural University, No. 211 Huimin Road, Wenjiang District, Chengdu, 611130, China.
Chemosphere. 2024 Oct;366:143390. doi: 10.1016/j.chemosphere.2024.143390. Epub 2024 Sep 26.
Silicon (Si) and selenium (Se), two environmental protection materials, which are beneficial to plant growth and stress resistance, can also alleviate crop stress induced by heavy metals. However, the effects of Si, Se and their interactions in reducing cadmium (Cd) toxicity and the related mechanisms require further elucidation. Hence, this study implemented a foliar application of Si and Se on soybean (Glycine max L.) that subjected to Cd-induced stress with four treatments (sole/combined application of Si, Se, no fertilizer treatment). The results demonstrated that Si and Se showed effective mitigation of Cd toxicity on soybeans mainly by promoting growth, enhancing photosynthesis, maintaining root vigor, improving antioxidant capacity, alleviating oxidative damage, altering the storage form, subcellular distribution of Cd in soybeans, and was more noticeable when combined overall (Si + Se＞Se＞Si). Si + Se increased root activity by 28% and CAT activity in leaves by 130.65%. Overall, the combined application of Si and Se exhibited a pronounced synergistic effect in enhancing the healthy growth of soybean plants under Cd pollution, with a more prominent impact observed following the second fertilization.
硅（Si）和硒（Se）是两种环保材料，它们有利于植物生长和抗逆性，还可以减轻重金属对作物的胁迫。然而，Si、Se 及其相互作用在减轻镉（Cd）毒性方面的效果及其相关机制仍需要进一步阐明。因此，本研究采用叶面喷施 Si 和 Se 的方法，对大豆（Glycine max L.）进行了处理，使其受到 Cd 胁迫，共设置了 4 种处理（单独/联合施用 Si、Se、不施肥处理）。结果表明，Si 和 Se 主要通过促进生长、增强光合作用、维持根系活力、提高抗氧化能力、减轻氧化损伤、改变 Cd 在大豆中的储存形式和亚细胞分布来有效缓解 Cd 对大豆的毒性，联合施用（Si + Se）的效果比单独施用 Se 或 Si 更明显（Si + Se＞Se＞Si）。Si + Se 使根活力增加了 28%，叶片中的 CAT 活性增加了 130.65%。总的来说，Si 和 Se 的联合施用在增强 Cd 污染下大豆植株的健康生长方面表现出显著的协同作用，第二次施肥后的效果更为明显。
