Abstract
The objective was to study different groups of bacteria that can adapt to extreme conditions of temperature, pH and salinity, as well as to identify bacterial strains from cultivated (CS) and non-cultivated (US) soil samples collected in the city of Brazlândia, Brazil. 38 strains were collected and submitted to growth tests at 45, 55, 65 and 75oC, pH of 3, 4, 5, 9, 10 and 11 and salinity of 5, 10 and 15% of NaCl. Eleven strains were selected based on their biochemical characterization and identified based on their 16S rDNA sequences. Four groups of bacteria in the CS and US samples were identified and able to grow under the most extreme conditions. Eleven bacterial strains were considered Gram-negative and separated into three groups based on their positive reactions to biochemical characteristics. Based on the glucose oxidation / fermentation test, seven strains belonged to Enterobacter sp. In addition, two strains of Pseudomonas sp. and two strains, which were not economically related to Giesbergeria sp. and Chryseobacterium sp. They were found. This study showed that some bacteria found in agricultural soils in Brazil have the potential to be used to control phytopathogens under extreme environmental conditions.
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