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
Highlights
Salinity is an abiotic factor that negatively affect crop yields worldwide, especially in arid and semiarid regions (Silini-Chérif et al, 2012)
Purification was made by bacterial strains depletion technique of striae, which were subsequently stored at -20°C, and performed in vitro plant growth promotion analysis: inorganic phosphate solubilization, biological nitrogen fixation, synthesis indole acetic acid, exopolysaccharide production, and expression of the quorum sensing molecule
It was observed that the bacterial density in both areas and niches present variation 102 to107 CFU g -1 soil or g -1 fresh plant tissue (CFU- colony forming units)
Summary
Salinity is an abiotic factor that negatively affect crop yields worldwide, especially in arid and semiarid regions (Silini-Chérif et al, 2012). Salinization occur due to inadequate irrigation management and excessive fertilization, contributing to the increase in areas with high concentrations of salts in the soil. The improvement of these soils is important to adopt recovery techniques and, among those, there is the possibility of using halophytes
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