EXOPOLYSACCHARIDES AND ABIOTIC STRESS TOLERANCE IN BACTERIAL ISOLATES FROM “SABIÁ” NODULES
2014
CYBELLE SOUZA OLIVEIRA | MARIO ANDRADE LIRA JUNIOR | NEWTON PEREIRA STAMFORD | JÚLIA KUKLINSKY-SOBRAL | FATIMA MARIA SOUZA MOREIRA
Several microorganisms produce polysaccharides, deemed to protect the bacteria from several environmental stresses. This paper aims to evaluate the protective effect of exopolyssacharides to different abi- otic stresses in bacterial isolates from “sabiá” ( Mimosa caesalpiniifolia ) nodules. 303 fast growing isolates were qualitatively evaluated for exopolyssacharide production and tested in vitro for tolerance to two levels of acidity, joint aluminum and acidity, three salinity levels; 11 antibiotics and three herbicides. Most isolates re- sisted media acidity, acidity with aluminum, salinity, and ampicillin, cefotaxime, gentamicin and vancomycin antibiotics and 2,4D herbicide, while being sensitive to ciprofloxacin, chloramphenicol, streptomycin, kanamy- cin, nalidixic acid, rifampicin and tetracycline antibiotics and paraquat and glyphosate herbicides. There was no connection between exopolyssacharide production and abiotic stress tolerance.
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