Abstract

ROCHA-GRANADOS, MA. DEL CARMEN et al. INCREASED TOLERANCE OF Casuarina equisetifolia TO SODIUM CHLORIDE CAUSED BY Pseudomonas fluorescens. Rev.Bio.Agro [online]. 2019, vol.17, n.2, pp.15-23. ISSN 1692-3561.  https://doi.org/10.18684/bsaa.v17n2.1249.

The use of tolerant species and beneficial microorganisms is an alternative in the recovery of saline soils. The objective of this research was to evaluate the efficiency of casuarina as a species tolerant to salinity and the effect of Pseudomonas fluorescens on this condition. This research tested salinity tolerance of casuarina and the additive effect of Pseudomonas fluorescens inoculation. The effect of sodium chloride (NaCl) on the casuarina germination was determined, the soil-plant interaction was analyzed on its tolerance to salinity and the effect of Pseudomonas flourescens strains (UM16, UM240, UM256 and UM270) on increased NaCl tolerance in casuarina. Results show that casuarina seed germination was delayed proportionally to NaCl concentration. NaCl tolerance was observed in dry biomass weight which decreased 3,50 to 23,48% in the roots and 1,18 to 30,66% in the aerial parts when compared to the absolute control. Innoculation of P. fluorescens strain UM256 increased dry biomass weight in the root and aerial part by 10,06 and 18,70%, respectively, when compared to the NaCl-treated control. In conclusion, the best result was for the plants that were inoculated with P. fluorescens strain UM256 which increases the tolerance of the plants to soil salinity conditions.

Keywords : Bacteria; NaCl; Salinity; Stress..

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