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© Research
Publication : Research in microbiology

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

Team: Group : Valérie Choumet
Team: Environment and Infectious Risks
Member: Anne Le Fleche
Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Research in microbiology - 01 Mar 2010

Pawlicki-Jullian N, Courtois B, Pillon M, Lesur D, Le Flèche-Mateos A, Laberche JC, Goncharova N, Courtois J

Link to Pubmed [PMID] – 20080178

Link to DOI – 10.1016/j.resmic.2009.12.009

Res Microbiol 2010 Mar; 161(2): 101-8

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 x 10(6) and 3 x 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.