Metabolic and physiological characteristics of salt-tolerant strains of Bradyrhizobium spp. |
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Authors: | Faviana Barboza Néstor S Correa Susana B Rosas |
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Institution: | (1) Laboratorio Fisiología Vegetal, Departamento Ciencias Naturales, Universidad Nacional de Río Cuarto, 5800 Río Cuarto, Cba, Argentina e-mail: srosas@exa.unrc.edu.ar, AR |
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Abstract: | Biochemical and physiological characteristics of salt-tolerant (88 mM, 264 mM and 440 mM NaCl) strains of Bradyrhizobium were evaluated according to their capacity for using different carbon sources, growth rate, resistance to antibiotics, plasmid
profile and exopolysaccharide production. Salt-tolerant strains significantly enhance their capacity to oxidize C sources
(about 75–85 compounds) by increasing growth rate and exopolysaccharide production involved in adhesion, resulting in a greater
adapting capacity to colonize unfavorable saline environments. However, salt stress could work as a curing agent and thus
the gene stability would become critical for the biological nitrogen-fixation information present in plasmids, as is the case
in Rhizobium.
Received: 5 January 1998 |
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Keywords: | Bradyrhizobium Salt stress Salt tolerance Metabolic characteristics |
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