Abstract Extracellular polysaccharides of isolates play an important role in the process of legumrhizobium identification and also as a protector against environmental tensions. To study the effects of production of extracellular polysaccharides of resistant Sinorhizobium to salinity conditions, some Sinorhizobium isolates which were resistant to salinity conditions were selected from Kerman province. TY medium with 4 salinity levels (sodium chloride) was used to study the tolerance of isolates to salinity conditions. Results showed that there was a meaningful difference between Sinorhizobium isolates considering resistance to salinity and isolates were classified into two groups: resistant and sensitive to salinity. The amount of production of extracellular polysaccharides of Sinorhizobium bacteria was also studied in 4 salinity levels. This study was performed randomly in a factorial form. According to the results, resistant isolates produced polysaccharides ten times more than sensitive ones. On the other hand, in concentration of 400 mM of salt, the isolates could produce more polysaccharides in compare to lower concentrations causing more resistance in these high concentrations.

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