International Journal of Agriculture and Agricultural Sciences ISSN 1712-3496 Vol. 5 (2), pp. 137-146 February, 2018. © Advanced Scholars Journals

Full length Research Paper

Nitrogen metabolism of sorghum plants subjected to salt stress and silicon concentration in Brazil

*Baccarin da Silva Amaral, Alberto Amado and Santos Lobos

Departamento de Solos e Adubos, Universidade Estadual Paulista Júlio de Mesquita Filho/UNESP, Brazil.

*Corresponding Author. Email: [email protected]

Accepted 15 January, 2018

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.