Response of brachiaria grass to selenium forms applied in a tropical soil
Ramos, S.J., Vale Technological Inst. - Mining, Belo Horizonte (Brazil) | Avila, F.W., Federal Univ. of Lavras (Brazil). Soil Science Dept. | Boldrin, P.F., Federal Univ. of Lavras (Brazil). Soil Science Dept. | Pereira, F.J., Federal Univ. of Lavras (Brazil). Biology Dept. | Castro, E.M., Federal Univ. of Lavras (Brazil). Biology Dept. | Faquin, V., Federal Univ. of Lavras (Brazil). Soil Science Dept. | Reis, A.R., Waseda Univ., Tokyo (Japan). Dept. of Civil and Environmental Engineering | Guilherme, L.R.G., Federal Univ. of Lavras (Brazil). Soil Science Dept.
In the present work, the effects of adding selenate and selenite on Se biofortification, antioxidant activity and anatomy alterations in Brachiaria brizantha were evaluated. The experiments were disposed in a completely randomized design in a 6 x 2 factorial scheme, by means of five levels of Se (0; 0.5; 1.0; 3.0 and 6.0 mg/kg) applied along with grass plant fertilizer, and two Se forms (sodium selenate and sodium selenite), with six replications. The results of the present study suggest that, in tropical soil conditions, the application of Se as selenate at low doses is more appropriate for B. brizantha biofortification than Se as selenite, because it favors a greater shoot Se levels, better activation of the antioxidant system and reduces on lipid peroxidation. Finally, with an increase of Se rates, cellular modifications were observed in internal structures of roots in B. brizantha, with aerenchyma appearing.
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