The Positive Effect of Sulfur on Selenium Detoxification Under Selenite Condition in Wheat

An experiment was performed to evaluate the regulatory effects of varied amounts of sulfur (S) on selenium (Se) uptake and distribution within wheat (Triticum aestivum L.) in response to selenite (SeO32-). The results showed that an appropriate amount of SeO32- (≤5 mg kg−1) improved the agronomic traits of wheat, and the addition of S significantly alleviated wheat growth inhibition caused by excessive SeO32- (≥15 mg kg−1). The Se concentration of different fractions in wheat grain showed a tendency of alkali-soluble Se > alcohol-soluble Se > water-soluble Se > salt-soluble Se. The use of S significantly reduced Se accumulation in each wheat part when the addition of SeO32- was ≤15 mg kg−1, but the Se distribution ratio of various wheat parts was not influenced by S supply. Overall, the application of S fertilizer is an effective technical measure to promote wheat production safety in high-Se areas.