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Modulation of nitrogen metabolism of maize plants inoculated with Azospirillum brasilense and Herbaspirillum seropedicae
- da Fonseca Breda, Farley Alexandre, da Silva, Thamires Ferreira Rodrigues, dos Santos, Silvana Gomes, Alves, Gabriela Cavalcanti, Reis, Veronica Massena
- Archives of microbiology 2019 v.201 no.4 pp. 547-558
- Azospirillum brasilense, Herbaspirillum seropedicae, ammonium, corn, enzyme activity, fertilizer application, hydroponics, leaves, nitrate reductase, nitrates, nitrogen, nitrogen content, nitrogen fertilizers, nitrogen metabolism, nitrogen-fixing bacteria, phosphorus, plant growth, potassium, roots, shoots, sugars
- Maize is highly responsive to the application of nitrogen to achieve high productivity. Inoculation with diazotrophic bacteria can improve plant growth with low N fertilization. The objective was to evaluate the inoculation of two species of diazotrophs on N metabolism in maize plants, in the presence of two concentrations of nitrogen in a hydroponic system. A factorial arrangement composed of two N levels (3.0 and 0.3 mM), with the presence of Hs—Herbaspirillum seropedicae, and Ab—Azospirillum brasilense or not. The parameters used were dry mass; N, P, and K accumulation; nitrate reductase activity; soluble fractions in roots and leaves. The inoculation altered the N metabolism and promoted greater development of maize plants, as well as a higher accumulation of P and K in the shoots. A more intensive process of N assimilation was evidenced when the plants were inoculated with H. seropedicae, leading to increased levels of NO₃⁻ and reduced N-amino, sugars, and NH₄⁺ in leaves associated with high N level, opposite of A. brasilense.