Authors : A.K.S. Lobato, L.M. Luz, R.C.L. Costa, B.G. Santos Filho, A.C.S. Meirelles, C.F. Oliveira Neto, H.D. Laughinghouse, M.A.M. Neto, G.A.R. Alves, M.J.S. Lopes and H.K.B. Neves
Abstract: The aim of this study was to investigate responses promoted by external application of silicon on nitrogen components in Capsicum annuum L. plants submitted to water deficiency. The experimental design was completely randomized, with 4 treatments (0, 0.25, 1.00 and 1.75 μM Si). Leaf relative water content suffered significant changes, with values of 51.9, 66.1, 68.9 and 74.4% in 0, 0.25, 1.00 and 1.75 μM Si treatments, respectively. In total soluble proteins under concentrations of 0, 0.25, 1.00 and 1.75 μM Si were obtained values of 3.8, 4.8, 5.5 and 4.9 mg g DM-1, respectively. This study suggests that exogenous silicon alleviates negative effects promoted by water deficiency on leaf relative water content, stomatal conductance, total soluble proteins, total soluble amino acids and glycinebetaine. Furthermore, the nitrate reductase activity were observed significant benefits only at the concentration of 0.25 μM Si+, however in free ammonium was no obtained improvement after silicon application. Proline level was maximized at concentrations of 1.00 and 1.75 μM Si.
A.K.S. Lobato, L.M. Luz, R.C.L. Costa, B.G. Santos Filho, A.C.S. Meirelles, C.F. Oliveira Neto, H.D. Laughinghouse, M.A.M. Neto, G.A.R. Alves, M.J.S. Lopes and H.K.B. Neves, 2009. Silicon Exercises Influence on Nitrogen Components in Pepper Subjected to Water Deficit?. Research Journal of Biological Sciences, 4: 1048-1055.