Abstract

Selenium is considered an essential nutrient for humans and animals, while studies into whether it is essential for higher plants continue. The global distribution of Se in soils is heterogeneous and depends on several factors, including human activities, geogenic origin, and microbial processes. Soil parent material is the primary source of Se in soils, particularly when soils originated from siliceous and carbonaceous shales, whereas lower Se soils mainly originated from acidic rocks. Anthropogenic factors controlling Se bioavailability in soil include mining, application of Se fertilizers, metal smelting, and the combustion of fossil fuels. Microorganisms are also crucial players in Se availability in soil through their control of Se form transformations and valence in soils. The importance of Se sources comes from its influence on human health. Selenium levels in the human diet depend on its presence and forms or speciations in soils and corresponding uptake by crops. Based on the projected role of Se and nano-Se in fighting many diseases, urgent investigations are needed to investigate its potential to assist in the fight against the COVID-19 pandemic. Many open questions remain concerning Se and nano-Se for human health, such as what are the proper concentrations in biofortification programs by crop? And how best to manage nano-biofortification with Se to combat malnutrition on the global level?

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Acknowledgments

This work was financialized and supported by the Central Department of Mission, Egyptian Ministry of Higher Education (Mission 19/2020) for H. El-Ramady and also by the Hungarian Tempus Public Foundation (TPF), grant no. AK-00152-002/2021.

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Correspondence to Hassan El-Ramady .

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El-Ramady, H., Omara, A.ED., El-Sakhawy, T., Prokisch, J., Brevik, E.C. (2022). Sources of Selenium and Nano-Selenium in Soils and Plants. In: Hossain, M.A., Ahammed, G.J., Kolbert, Z., El-Ramady, H., Islam, T., Schiavon, M. (eds) Selenium and Nano-Selenium in Environmental Stress Management and Crop Quality Improvement. Sustainable Plant Nutrition in a Changing World. Springer, Cham. https://doi.org/10.1007/978-3-031-07063-1_1

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