African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6576

Full Length Research Paper

Nitrogen metabolism in sorghum under salinity and silicon treatments in Brazil

Luma Castro de Souza
  • Luma Castro de Souza
  • Departamento de Solos e Adubos, Universidade Estadual Paulista Júlio de Mesquita Filho/UNESP, Brazil.
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Ellen Gleyce da Silva Lima
  • Ellen Gleyce da Silva Lima
  • Departamento de Produção Vegetal, Universidade Federal Rural da Amazônia, Brazil.
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Risely Ferraz de Almeida
  • Risely Ferraz de Almeida
  • Departamento de Solos e Adubos, Universidade Estadual Paulista Júlio de Mesquita Filho/UNESP, Brazil.
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Myriam Galvão Neves
  • Myriam Galvão Neves
  • Departamento de Produção Vegetal, Universidade Federal de Santa Maria, Santa Maria, Brazil.
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Glauco Andre dos Santos Nogueira
  • Glauco Andre dos Santos Nogueira
  • Departamento de Produção Vegetal, Universidade Federal Rural da Amazônia, Brazil.
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Cândido Ferreira de Oliveira Neto
  • Cândido Ferreira de Oliveira Neto
  • Departamento de Produção Vegetal, Universidade Federal Rural da Amazônia, Brazil.
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Andresa Soares da Costa
  • Andresa Soares da Costa
  • Departamento de Produção Vegetal, Universidade Federal Rural da Amazônia, Brazil.
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Liliane Corrêa Machado
  • Liliane Corrêa Machado
  • Departamento de Produção Vegetal, Universidade Federal Rural da Amazônia, Brazil.
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Silvia Mara Coelho do Nascimento
  • Silvia Mara Coelho do Nascimento
  • Departamento de Produção Vegetal, Universidade Federal Rural da Amazônia, Brazil.
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Ana Ecídia de Araújo Brito
  • Ana Ecídia de Araújo Brito
  • Departamento de Produção Vegetal, Universidade Federal Rural da Amazônia, Brazil.
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  •  Received: 28 September 2015
  •  Accepted: 09 December 2015
  •  Published: 21 January 2016

Abstract

The objective of the present research was to study nitrogen metabolism in sorghum plants subjected to salt stress and silicon concentration. The experiment was conducted at the Amazon Federal Rural University, Capitão Poço Decentralized Unit for 1 month, in 2013, using the cultivar BR 700 of forage sorghum plants (Sorghum bicolor [Moench.]). The experimental design was completely randomized, in a 5 × 3 factorial arrangement (0, 50, 100, 150 and 200 µM of silicon) and saline concentrations (0, 1.5 and 2.0 M), consisting of 4 replications. Analyses were conducted of amino acids, proteins, free ammonium, nitrate and nitrate reductase. Nitrate content increased in the leaves and root in the treatments 0 and 1.5 µM of Si, but decreased in treatments with the 0.5 and 1.0 µM doses of Si. In leaves and roots, the treatments 1.5 and 2.0 of SC caused reduction and increase, respectively, of ammonium levels. The silicon doses attenuated the negative effects of the treatments on the biochemical compounds caused by higher salt concentrations in sorghum plants.

 

Key words: Abiotic stress, Sorghum bicolor, salinity, silicon, nitrogen metabolism.