Selenium in agriculture: a nutrient or contaminant for crops?

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Beneficial elements for agricultural crops and their functional relevance in defence against stresses (2016, background): “…(1) helping to maintain ion balance and structural integrity of cells, hence regulating the uptake and redistribution of elements essential in the antioxidative system (Table1), and (2) interfering with the electron transport complex (ETC) of the photosynthetic system (Kaur et al. 2014; Figure 2).”
Understanding selenium metabolism in plants and its role as a beneficial element (2019, background): “Selenium serves as an anti-senescent and helps in maintenance of cellular structure and function, thus, contributes towards improved plant growth and development (Kaur et al., 2014; Balk & Pilon, 2011).”
An Overview of Selenium Uptake, Metabolism, and Toxicity in Plants (2017, background): “…centre of several selenoproteins, such as glutathione peroxidase (GSHPx), thioredoxin reductase, and iodothyronine-deiodinases hence, it is important in the scavenging of free radicals, protection against oxidative stress, strengthening of immune system etc. (Méplan, 2011; Kaur et al., 2014).”