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Selenium and sulfur have similar chemical structures. This allows Se to be absorbed and incorporated in the same assimilation pathways as S. Onions ( Allium cepa  L.) are a crop with unique S metabolism, responsible for growth and flavor intensity. Because of the antagonistic behavior of the two ions, the effects of Se on S and Se nutrient depletion and tissue accumulation were investigated. `Granex 33' onions were grown in nutrient solutions with one concentration of S and increasing Se concentrations. Selenium was applied as sodium selenate (Na 2 SeO 4 ) at concentrations of 0, 0.5, 1.0, 1.5, and 2.0 mg·L -1 . Selenium depletion from the nutrient solution increased linearly with increasing Na 2 SeO 4  treatment concentrations. Sulfur depletion increased and then decreased with increasing Na 2 SeO 4  treatment concentrations. Selenium and S accumulation were highest in leaf tissues, less in root tissues, and lowest in bulb tissues at plant maturity. Selenium accumulation increased linearly with increasing Na 2 SeO 4  for all tissues analyzed. Sulfur accumulation in leaf and bulb tissues was quadratic in response to increasing SeO 4  -2 , while S in root tissues decreased linearly with increasing Na 2 SeO 4 . Low concentrations of Na 2 SeO 4  in our study enhanced S uptake and accumulation. Previously, Se was thought to competitively inhibit S uptake and metabolism.

Selenate Concentration Affects Selenium and Sulfur Uptake and Accumulation by `Granex 33' Onions