Selenium biofortification and antioxidant activity in lettuce plants fed with selenate and selenite
2010
Ramos, S.J.,Cornell Univ., Ithaca (USA). Robert W. Holley Center for Agriculture and Health | Faquin, V.,Federal Univ. of Lavras (Brazil). Soil Science Dept. | Guilherme, L.R.G.,Federal Univ. of Lavras (Brazil). Soil Science Dept. | Castro, E.M.,Federal Univ. of Lavras (Brazil). Biology Dept. | Avila, F.W.,Federal Univ. of Lavras (Brazil). Soil Science Dept. | Carvalho, G.S.,Federal Univ. of Lavras (Brazil). Soil Science Dept. | Bastos, C.E.A.,Federal Univ. of Lavras (Brazil). Soil Science Dept. | Oliveira, C.,Federal Univ. of Lavras (Brazil). Biology Dept.
An experiment was conducted under greenhouse conditions with pots containing 3 L of nutritive solution in a completely randomized factorial design, with seven Se concentrations (0, 2, 4, 8, 16, 32, and 64 micromol/L) and two forms of Se (sodium selenate - Na2SeO4 and sodium selenite - Na2SeO3), with six replicates. The application of Se as selenate at low concentrations is more appropriate for lettuce biofortification because it favours shoot biomass growth and Se levels in the shoot biomass. Se in both forms had two effects on lettuce plant metabolism: at low doses it acted as an antioxidant and enhanced plant growth, whereas at higher levels it reduced yield.
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