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Development and nitrate reductase activity of sugarcane inoculated with five diazotrophic strains

Authors
  • dos Santos, Silvana Gomes1
  • da Silva Ribeiro, Flaviane1
  • da Fonseca, Camila Sousa2
  • Pereira, Willian1
  • Santos, Leandro Azevedo1
  • Reis, Veronica Massena2
  • 1 Universidade Federal Rural do Rio de Janeiro, Km 07, BR 465, Seropédica, Rio de Janeiro, 23890-000, Brazil , Rio de Janeiro (Brazil)
  • 2 Embrapa Agrobiologia, Km 07, BR 465, Seropédica, Rio de Janeiro, 23891-000, Brazil , Rio de Janeiro (Brazil)
Type
Published Article
Journal
Archives of Microbiology
Publisher
Springer Berlin Heidelberg
Publication Date
Mar 20, 2017
Volume
199
Issue
6
Pages
863–873
Identifiers
DOI: 10.1007/s00203-017-1357-2
Source
Springer Nature
Keywords
License
Yellow

Abstract

Diazotrophs are able to stimulate plant growth. This study aimed at evaluating the effect of inoculation of five diazotrophic strains on growth promotion and nitrate reductase (NR, EC 1.7.1.1) activity in sugarcane. An experiment was carried out from three stages of cultivation: sprouting, tubes, and in hydroponics. On the first two stages, seven treatments were adopted: uninoculated control; mixed inoculation with five strains; and individual inoculation with Gluconacetobacter diazotrophicus (Gd), Herbaspirillum rubrisubalbicans (Hr), Herbaspirillum seropedicae (Hs), Nitrospirillum amazonense (Na), and Paraburkholderia tropica (Pt). The four treatments showing the best performance were transferred to the hydroponic system for analysis of NR activity. Hs, Pt, and the mixture of all strains led to the highest seedling biomass in tubes, followed by Hr. In hydroponics, the mixture and the strain Hr had the highest growth-promoting effect. NR activity was influenced by inoculation only under low N supply conditions, with positive effect of Hr, Pt, and the mixture.

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