Cadmium (Cd) toxicity can disorder normal plant growth and development causing catastrophic crop failures and food insecurity. Silicon (Si) plays a pivotal role in mitigation of toxic stress by influencing plant physiological and metabolic responses. This attempt was conducted to evaluate the efficiency of Si on physio-biochemical traits and secondary metabolites production of basil plant under Cd stress. In this direction, the plants were grown in greenhouse condition and subjected to various concentration of Cd (0, 25, and 50 mg kg⁻¹ soil) and foliar of Si solutions (0, 1 and 2 mM) alone and/or in combination. Cd toxicity amplified activities of defense enzymes and compounds, oxidation of cell membrane, and production of secondary metabolites. With increasing Cd toxicity in soil, the level of Cd dramatically raised in both shoot and root of basil. The results indicated that Si has an anti-stress effect on Cd-contaminated basil plants. Thereupon, Si supply alleviated Cd toxicity and promoted basil growth by reducing Cd accumulation, root-to-shoot Cd transport, Malondialdehyde (MDA) content, electrolyte leakage (EL) percentage and increasing activity of antioxidant enzymes, concentration of phenolics and flavonoids, as well as the amount of caffeic, chicoric and rosmarinic acids.

镉（Cd）毒性会扰乱正常植物的生长和发育，导致灾难性的农作物歉收和粮食不安全。硅（Si）通过影响植物的生理和代谢反应，在缓解毒性胁迫中起关键作用。进行了这一尝试，以评估硅对镉胁迫下罗勒植物生理生化特性和次生代谢产物产生的效率。在这个方向上，植物在温室条件下生长，并经受各种浓度的Cd（0、25和50 mg kg ^-1土壤溶液和硅溶液的叶面（0、1和2 mM）单独和/或组合使用。镉的毒性放大了防御酶和化合物的活性，细胞膜的氧化以及次级代谢产物的产生。随着土壤中Cd毒性的增加，罗勒的芽和根中Cd的含量急剧增加。结果表明Si对Cd污染的罗勒植物具有抗胁迫作用。因此，硅供应通过减少Cd的积累，从根到下的Cd转运，丙二醛（MDA）含量，电解质泄漏（EL）百分比和增加的抗氧化酶活性，酚类和类黄酮的浓度，减轻了Cd毒性并促进了罗勒的生长。以及咖啡酸，癸酸和迷迭香酸的含量。