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Foliar application of nanoceria attenuated cadmium stress in okra (Abelmoschus esculentus L.)

Journal of Hazardous Materials, ISSN: 0304-3894, Vol: 445, Page: 130567
2023
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Article Description

Foliar application of nanoparticles (NPs) as a means for ameliorating abiotic stress is increasingly employed in crop production. In this study, the potential of CeO 2 -NPs as stress suppressants for cadmium (Cd)-stressed okra ( Abelmoschus esculentus ) plants was investigated, using two cycles of foliar application of CeO 2 -NPs at 200, 400, and 600 mg/l. Compared to untreated stressed plants, Cd-stressed plants treated with CeO 2 -NPs presented higher pigments (chlorophyll a and carotenoids). In contrast, foliar applications did not alter Cd root uptake and leaf bioaccumulation. Foliar CeO 2 -NPs application modulated stress enzymes (APX, SOD, and GPx) in both roots and leaves of Cd-stressed plants, and led to decreases in Cd toxicity in plant’s tissues. In addition, foliar application of CeO 2 -NPs in Cd-stressed okra plants decreased fruit Cd contents, and improved fruit mineral elements and bioactive compounds. The infrared spectroscopic analysis of fruit tissues showed that foliar-applied CeO 2 -NPs treatments did not induce chemical changes but induced conformational changes in fruit macromolecules. Additionally, CeO 2 -NPs applications did not alter the eating quality indicator (Mg/K ratio) of okra fruits. Conclusively, the present study demonstrated that foliar application of CeO 2 -NPs has the potential to ameliorate Cd toxicity in tissues and improve fruits of okra plants.

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