Plant Soil Environ., 2009, 55(6):238-244 | DOI: 10.17221/84/2009-PSE

Nitrogen compounds and enzyme activities in sorghum induced to water deficit during three stages

C.F. Oliveira Neto1, A.K.S. Lobato2, R.C.L. Costa1, W.J.M.S. Maia1, B.G. Santos Filho1, G.A.R. Alves1, B. Brinez2, H.K.B. Neves1, M.J. Santos Lopes1, F.J.R. Cruz1
1 Laboratório de Fisiologia Vegetal Avançada, Universidade Federal Rural da Amazônia, Belém, Brazil
2 Núcleo de Pesquisa Aplicada a Agricultura, Universidade Estadual de Maringá,

The aim of this study was to evaluate and explicate the changes in the nitrogen compounds and enzyme activities in Sorghum bicolor plants (cv. BR-700) submitted to water deficit during vegetative, reproductive and maturation stages. The experimental design used was entirely randomized in factorial scheme, with two conditions (control and stress) combined with three stages (vegetative, reproductive and maturation). The nitrate level was increased at 180.6, 72.9 and 78.9% during the vegetative, reproductive and maturation stages, respectively. The total soluble amino acids and glycinebetaine increased only during vegetative and reproductive stages, if compared with control plants. However, besides protein levels during all stages, significant reductions were reported in nitrate reductase and glutamine synthetase activities; free ammonium presented decreases at 37.3 and 77.6% in vegetative and reproductive stages, respectively, when compared with control plants.

Keywords: Sorghum bicolor L.; nitrogen; nitrate; ammonium; water deficit

Published: June 30, 2009  Show citation

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Oliveira Neto CF, Lobato AKS, Costa RCL, Maia WJMS, Santos Filho BG, Alves GAR, et al.. Nitrogen compounds and enzyme activities in sorghum induced to water deficit during three stages. Plant Soil Environ. 2009;55(6):238-244. doi: 10.17221/84/2009-PSE.
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