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Exopolysaccharide production by nitrogen-fixing bacteria within nodules of Medicago plants exposed to chronic radiation in the Chernobyl exclusion zone

Research in Microbiology, ISSN: 0923-2508, Vol: 161, Issue: 2, Page: 101-108
2010
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Article Description

Nitrogen-fixing bacteria isolated from root nodules of Medicago plants growing in the 10 km zone around the Chernobyl nuclear power plant were screened for the production of new water-soluble acidic exopolysaccharides (EPSs). The different strains belonged to the Enteriobacteriaceae family ( Enterobacter ludwigii, Raoultella terrigena, Klebsiella oxytoca ), except for one which belonged to the Rhizobiaceae family ( Sinorhizobium meliloti ). All of the bacteria produced highly viscous EPS with an average molecular weight comprised between 1 × 10 6 and 3 × 10 6  Da. Five different compositions of EPS were characterized by physico-chemical analyses and 1 H NMR spectroscopy: galactose/mannose (2/1), galactose/glucose (1/1), galactose/glucose/mannose (1/2/1), fucose/galactose/glucose (2/1/1) and fucose/galactose/glucose/mannose (2/2/1/1 or 1/1/2/4). Glucuronic acid, a charged monosaccharide, was also recovered in most of the different EPSs.

Bibliographic Details

Pawlicki-Jullian, Nathalie; Courtois, Bernard; Pillon, Michelle; Lesur, David; Le Flèche-Mateos, Anne; Laberche, Jean-Claude; Goncharova, Nadia; Courtois, Josiane

Elsevier BV

Immunology and Microbiology; Biochemistry, Genetics and Molecular Biology

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