Kale Carotenoids Are Unaffected by, whereas Biomass Production, Elemental Concentrations, and Selenium Accumulation Respond to, Changes in Selenium Fertility
Selenium (Se) is a micronutrient in mammalian nutrition and is accumulated in kale (Brassica oleracea L. var. acephala), which has high levels of lutein and β-carotene. Selenium, lutein, and β-carotene have important human health benefits and possess strong antioxidant properties. The objectives of this study were to determine the influence of different Se [as sodium selenate (Na2SeO4) and sodium selenite (Na2SeO3)] fertility levels on (1) biomass accumulation, (2) the accumulation patterns of carotenoid pigments, and (3) elemental accumulation in the leaves of kale. Winterbor kale was greenhouse-grown using nutrient solution culture with Se treatment concentrations of 0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, and 3.5 mg Se/L as Na2SeO4 and 0.0, 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 mg Se/L as Na2SeO3. Increases in either selenate (SeO4-2) or selenite (SeO3-2) resulted in decreases in kale leaf tissue biomass. Neither of the Se treatments had an effect on the accumulation of lutein or β-carotene in leaf tissues. Increasing SeO4-2 significantly increased the accumulation of kale leaf Se; however, leaf tissue Se did not significantly change over the SeO3-2 treatments. Increases in SeO4-2 affected the leaf tissue concentrations of P, K, Ca, Mg, S, B, Cu, Mn, and Mo, whereas SeO3-2 only affected B and S. Growing kale in the presence of SeO4-2 would result in the accumulation of high levels of tissue Se without affecting carotenoid concentrations.
Kale Carotenoids Are Unaffected by, whereas Biomass Production, Elemental Concentrations, and Selenium Accumulation Respond to, Changes in Selenium Fertility Mark G. Lefsrud and, Dean A. Kopsell, David E. Kopsell, William M. Randle Journal of Agricultural and Food Chemistry 2006 54 (5), 1764-1771