African Journal of
Microbiology Research

  • Abbreviation: Afr. J. Microbiol. Res.
  • Language: English
  • ISSN: 1996-0808
  • DOI: 10.5897/AJMR
  • Start Year: 2007
  • Published Articles: 5183

Full Length Research Paper

Bioprospecting and plant growth-promoting bacteria tolerant to salinity associated with Atriplex nummularia L. in saline soils

Flaviana Gonçalves da Silva*
  • Flaviana Gonçalves da Silva*
  • Universidade Federal de Sergipe, Av. Marechal Rondon, s/n, 49100-000, São Cristóvão, SE, Brazil.
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Isaneli Batista dos Santos
  • Isaneli Batista dos Santos
  • Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo, Avenida Pádua Dias, 11, 13419-900, Piracicaba, SP, Brazil.
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Adjailton Jose de Sousa
  • Adjailton Jose de Sousa
  • Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo, Avenida Pádua Dias, 11, 13419-900, Piracicaba, SP, Brazil.
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Andreza Raquel Barbosa Farias
  • Andreza Raquel Barbosa Farias
  • Universidade Federal do Ceará, Av. da Universidade, 2853, Benfica, 60020-181, Fortaleza, CE, Brazil.
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Williane Patricia da Silva Diniz
  • Williane Patricia da Silva Diniz
  • Universidade Federal Rural de Pernambuco, Rua Dom Manoel de Medeiros, s/n, Dois Irmãos, 52171-900, Recife, PE, Brazil.
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Julia Kuklilinsky Sobral
  • Julia Kuklilinsky Sobral
  • Universidade Federal Rural de Pernambuco, Rua Dom Manoel de Medeiros, s/n, Dois Irmãos, 52171-900, Recife, PE, Brazil.
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Maria Betania Galvao dos Santos Freire
  • Maria Betania Galvao dos Santos Freire
  • Universidade Federal Rural de Pernambuco, Rua Dom Manoel de Medeiros, s/n, Dois Irmãos, 52171-900, Recife, PE, Brazil.
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  •  Received: 08 July 2016
  •  Accepted: 02 August 2016
  •  Published: 21 August 2016

Abstract

This study aimed to bioprospect and select halotolerantes bacteria and promoting plant growth associated with the plant Atriplex nummularia L. in saline soils. For bioprospecting of bacteria, samples were collected in five niches and two field experiments located in Serra Talhada and Ibimirim, Pernambuco, Brazil. After collecting the material it was performed the isolation and selection of bacteria based on plant growth promotion mechanisms. 107 bacterial salt tolerant isolates were obtained in which the population density of bacteria was higher in the rhizosphere (107 CFU g-1 soil), the cultivated soil (106 CFU g-1 soil) and uncultivated soil (105 CFU g-1 soil). For the solubilization rate of inorganic phosphate was obtained 65 and 25% positives isolated in 0 to 5% NaCl concentration, respectively. For the characteristics of biological fixation nitrogen, indole acetic acid production, exopolysaccharides and quorum sensing molecule, reached up to 87 percent; 100; 83.33 and 96.66% of the bacteria, respectively. Therefore, the bacterial isolates UAGAt 89 and UAGAt 101 expressed greater tolerance to salinity when analyzed in relation to the characteristics that promote plant growth, making it promising for future studies in order to contribute to the development of Atriplex plants and rehabilitation of soil affected by salts.

Key words: Halophytes, quorum sensing, exopolysaccharide, phytoremediation