Abstract
Zinc oxide nano particles (ZnO NPs) have been employed as a novel strategy to regulate plant tolerance and alleviate heavy metal stress, but our scanty knowledge regarding the systematic role of ZnO NPs to ameliorate chromium (Cr) stress especially in rice necessitates an in-depth investigation. An experiment was performed to evaluate the effect of different concentrations of ZnO NPs (e.g., 0, 25, 50, 100 mg/L) in ameliorating the Cr toxicity and accumulation in rice seedlings in hydroponic system. Our results demonstrated that Cr (100 µM) severely inhibited the rice seedling growth, whereas exogenous treatment of ZnO NPs significantly alleviated Cr toxicity stress and promoted the plant growth. Moreover, application of ZnO NPs significantly augmented the germination energy, germination percentage, germination index, and vigor index. In addition, biomass accumulation, antioxidants (SOD, CAT, POD), nutrient acquisition (Zn, Fe) was also improved in ZnO NPs-treated plants, while the lipid peroxidation (MDA, H2O2), electrolyte leakage as well as Cr uptake and in-planta accumulation was significantly decreased. The burgeoning effects were more apparent at ZnO NPs (100 mg/L) suggesting the optimum treatment to ameliorate Cr induced oxidative stress in rice plants. Furthermore, the treatment of ZnO NPs (100 mg/L) reduced the level of endogenous abscisic acid (ABA) and stimulated the growth regulator hormones such as brassinosteroids (BRs) possibly linked with enhanced phytochelatins (PCs) levels. The ultrastructure analysis at cellular level of rice revealed that the application of 100 mg/L ZnO NPs protected the chloroplast integrity and other cell organells via improvement in plant ionomics, antioxidant activities and down regulating Cr induced oxidative stress in rice plants. Conclusively, observations of the current study will be helpful in developing stratigies to decrease Cr contamination in food chain by employing ZnO NPs and to mitigate the drastic effects of Cr in plants for the sustainable crop growth.
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We acknowledge the contributions of Mr. Temoor Ahmed for his help in data analysis and proof-reading of this manuscript
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This research was supported by Zhejiang Provincial Natural Science Foundation (No. LY21C130006), National Natural Science Foundation of China (No. 32072127), Dabeinong Funds for Discipline Development and Talent Training in Zhejiang University, and Collaborative Innovation Center for Modern Crop Production co-sponsored by Province and Ministry (CIC-MCP).
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Conceptualization: MS and GY. Methodology: MS, GY, FB and MMN. Formal analysis and investigation: FB, MMN, SA, MTJ and TN. Writing—original draft preparation: FB, YL, and MMN. Writing—review and editing: MS, MTJ, FB, SA, YL and TN. Funding acquisition: GY. Supervision: MS and GY.
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Basit, F., Nazir, M.M., Shahid, M. et al. Application of zinc oxide nanoparticles immobilizes the chromium uptake in rice plants by regulating the physiological, biochemical and cellular attributes. Physiol Mol Biol Plants 28, 1175–1190 (2022). https://doi.org/10.1007/s12298-022-01207-2
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DOI: https://doi.org/10.1007/s12298-022-01207-2