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ADDITIONAL INDEX WORDS. Brassicaceae, selenium nutrition, anticarcinogenic, isothiocyanates ABSTRACT. Glucosinolates are sulfur-containing secondary plant metabolites commonly found in the family Brassicaceae. The presence of selenium in soils increases the uptake of sulfur and inhibits the production of glucosinolates in brassicaceous plants. This study was undertaken to determine the extent of selenium's impact on sulfur uptake and glucosinolate production in Brassica oleracea L. Rapid-cycling B. oleracea plants were grown hydroponically in half-strength Hoagland's nutrient solution with selenium treatments delivered as sodium selenate concentrations of 0.0, 0.5, 0.75, 1.0, and 1.5 mgL -1 . Elevated sulfur treatments of 37 mgL -1 sulfate and 37 mgL -1 sulfate/0.75 mgL -1 selenate were incorporated to compare with selenium treatments. Plants were harvested and freeze-dried 1 day before anthesis. Selenium and sulfur content of plant tissue was determined by flame atomic absorption spectrophotometry and a carbon-nitrogen-sulfur analyzer. Glucosinolate content of leaf tissue was determined by high-performance liquid chromatography. Selenium and sulfur uptake in plants positively correlated with selenium concentration in the nutrient solution. The sulfur concentration of plants exposed to selenium equaled or exceeded the sulfur concentration of plants exposed to elevated sulfur. Despite higher sulfur concentrations, there occurred a statistically significant decrease in production of five of the seven glucosinolates analyzed in selenium- enriched plants. Plants that underwent elevated sulfur treatments had higher glucosinolate production than selenium- treated plants. These results suggest that selenium either upregulates or prevents the downregulation of sulfur uptake in B. oleracea. In addition, the presence of selenium within the plant appears to have a negative impact on the production of certain glucosinolates despite adequate availability of sulfur. Plants in the family Brassicaceae play integral roles in the diets of the world's population.Brassica oleracea, for example, includes the following staple food cultivars: cabbage, broccoli, cauliflower, kale, kohlrabi, and brussels sprouts. Brassicaceous plants are also known for their production of the S-containing secondary plant metabolites, glucosinolates. Glucosinolate concentrations in plants can significantly alter an animal's health. High-glucosinolate diets initiate such undesirable effects as enlargement of the thyroid gland, decreased organ weight, and obstruction of nitrogen nutrition

Selenium Increases Sulfur Uptake and Regulates Glucosinolate Metabolism in Rapid-cycling Brassica oleracea