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Effect of Metallic Nanoparticles and Ions on Seeds Germinating Under Cadmium Stress

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Abstract

Cadmium contamination of soil and water as a result of industrialization and inappropriate agricultural practices is a global problem. As Cd is a toxic and carcinogenic element, its uptake into crops and transfer to the food chain poses serious health risks. Nanoparticles (NPs) are considered as promising materials for agriculture, which can be used as fertilizers, growth promoters, or to reduce negative environmental impacts. Therefore, the effect of Ag, Fe3O4, MnO2, TiO2, and ZnO NPs on the root elongation and Cd accumulation in germinating white mustard under cadmium stress was investigated in this study. The efficiency of NPs was compared with the effect of Ag+, Fe2+, Mn2+, and Zn2+ ions. Amelioration of Cd stress (Cd reduced root length to 46.9% of the control) was provided by ZnO NPs (root length restored to 76.5% of the control) and Zn2+ ions (56.7% of the control) at pH 8, while at pH 6 mainly ionic Zn2+ was toxic. Ag NPs (root length 107.7 and 129.6% of the control at pH 8 and pH 6, respectively) and Ag+ ions (157.5% and 137.6% of the control at pH 8 and pH 6, respectively) increased root elongation of seedlings unexposed to Cd and to some extent (insignificantly) under Cd stress as well. The reduction of Cd uptake into the seedlings in the presence of ZnO NPs and Zn2+ ions from 28.30 to 19.57 and to 23.04 µg/g DW at pH 8, respectively, and from 33.29 to 28.30 and to 25.90 µg/g DW at pH 6, respectively, was probably responsible for the protective effect of these substances. Other materials tested did not significantly affect the root growth under Cd stress, nor did they reduce Cd accumulation in the seedlings as well. The role of the chemical species was more decisive than the role of its form.

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Funding

The work was supported by the Ministry of Education, Youth and Sports of the Czech Republic from European Regional Development Fund-Project “Center for Experimental Plant Biology”: No. CZ.02.1.01/0.0/0.0/16_019/0000738. Further, the authors would like to thank for financial support provided by the Research Infrastructure NanoEnviCz, supported by the Ministry of Education, Youth and Sports of the Czech Republic under Project No. LM2018124.

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PL designed experiments, participated on phytotoxicity assays, and wrote the manuscript. SP performed element analysis. PS performed statistical analysis. PD and JK characterized nanoparticles. KM participated on phytotoxicity assays. All authors revised the manuscript.

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Correspondence to Premysl Landa.

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The authors declare no conflict of interest

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Handling Editor: Vinay Kumar.

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Landa, P., Petrova, S., Dytrych, P. et al. Effect of Metallic Nanoparticles and Ions on Seeds Germinating Under Cadmium Stress. J Plant Growth Regul 42, 7749–7758 (2023). https://doi.org/10.1007/s00344-023-11049-1

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  • DOI: https://doi.org/10.1007/s00344-023-11049-1

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