نهمین کنفرانس ملی و اولین کنفرانس بین المللی فیزیولوژی گیاهی

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کد مقاله 1158

عنوان Correlation Between Zinc Oxide Nanoparticles and Hormonal-Antioxidant Responses in Solanum lycopersicum L. Under Cadmium Stress

نویسندگان Hediye Eghbali - Ali Akbar Ghotbi-Ravandi

چکیده Heavy metal stress, particularly cadmium (Cd), induces oxidative damage in plants by generating excessive reactive oxygen species (ROS). This study aimed to evaluate the effects of zinc oxide nanoparticles (ZnO-NPs) on antioxidant defense, lipid peroxidation, and salicylic acid (SA) signaling in tomato leaves under Cd stress. ZnO-NPs were synthesized and characterized using scanning electron microscopy (SEM), revealing predominantly spherical particles with uniform size distribution. 30-day-old tomato plants in the vegetative stage were treated with 50 mg/L ZnO-NP solution, 1000 mg/kg soil CdCl2 solution or a combination, and leaf samples were collected at 24 and 96 hours. Catalase (CAT) activity, malondialdehyde (MDA) content, and SA concentration were measured spectrophotometrically and via HPLC. Cd exposure significantly increased CAT activity, MDA levels, and SA accumulation compared to control. ZnO-NPs alone slightly enhanced SA levels without affecting CAT activity. Notably, co-application of ZnO-NPs with Cd reduced MDA accumulation and modulated SA content compared to Cd treatment alone, indicating a protective effect of nanoparticles against oxidative stress. These findings suggest that ZnO-NPs can enhance plant resilience under heavy metal stress by partially alleviating lipid peroxidation and regulating antioxidant and hormonal responses.

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