Abstract
In a greenhouse experiment, Brassica plants were grown in an alkaline sandy loam soil treated with different levels of selenate selenium (Se) or selenite Se ranging from 0 to 4 mg Se kg−1. Plants grown in Se-treated soil were stressed at an early stage of pod setting and produced fewer pods per plant. Selenium accumulation increased by 2- to 35-fold in shoots, 3- to 19-fold in roots, and 2- to 57-fold in grains. Selenium accumulation in grains resulted in significant increases in contents of reducing sugars, starch, glucosinolate, and free and sulfur-containing amino acids and a decrease in lipid content. Selenium accumulation significantly increased the proportions of different lipid classes such as glycolipids, sterols, and free fatty acids whereas triacylglyceride content showed the reverse trend. Oil extracted from Brassica grains grown in the seleniferous region contained Se within safe limits and thus is safe for human consumption.
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