Heilongjiang Vocational College of Agricultural Technology, Jiamusi, People's Republic of China.
Jiamusi Technician College, Jiamusi, People's Republic of China.
Environ Technol. 2024 Sep;45(23):4725-4736. doi: 10.1080/09593330.2023.2283073. Epub 2023 Nov 28.
Cadmium (Cd) pollution is a serious threat to food safety and human health. Minimization of Cd uptake and enhancing Cd tolerance in plants are vital to improve crop yield and reduce hazardous effects to humans. In this study, we investigate the effect of a synergistic system with phytohormone (24-Epibrassinolide, EBL) and silicon (Si) on Cd toxicity and accumulation of rice plants. The results revealed that Si, EBL and their combination rescued Cd-induced growth inhibition, as evidenced by the increased dry weight of root and shoot. The chlorophyll content and photosynthetic performance were improved. The activity of antioxidant enzymes (SOD, POD and CAT) was increased and oxidative stress was alleviated. More importantly, Cd content in root was decreased by 20.25%, 17.72% and 27.84%, while Cd content in shoot decreased by 21.17%, 16.47% and 25.88%, respectively. Moreover, Si, EBL and Si + EBL treatment enriched cell wall-bound Cd and reduced Cd toxicity to functional organelles. Meanwhile, the residual form of Cd was enriched and the highly toxic forms of Cd (inorganic and water-soluble Cd) were decreased. The joint application showed better effects than applying Si and EBL alone. Collectively, this study provides an effective way for Cd toxicity mitigation in rice plants.
镉（Cd）污染对食品安全和人类健康构成严重威胁。减少植物对镉的吸收并增强其镉耐性，对于提高作物产量和降低对人类的危害至关重要。在本研究中，我们研究了植物激素（24-表油菜素内酯，EBL）和硅（Si）协同系统对水稻植株镉毒性和积累的影响。结果表明，Si、EBL 及其组合可挽救 Cd 诱导的生长抑制，表现在根和茎的干重增加。叶绿素含量和光合性能得到改善。抗氧化酶（SOD、POD 和 CAT）的活性增加，氧化应激得到缓解。更重要的是，根中 Cd 含量分别降低了 20.25%、17.72%和 27.84%，而茎中 Cd 含量分别降低了 21.17%、16.47%和 25.88%。此外，Si、EBL 和 Si+EBL 处理增加了细胞壁结合态 Cd 的含量，降低了 Cd 对功能细胞器的毒性。同时，Cd 的残留形态得到富集，高毒性的 Cd 形态（无机和水溶性 Cd）减少。联合应用比单独施用 Si 和 EBL 效果更好。总之，本研究为减轻水稻植株镉毒性提供了一种有效途径。
