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- W2491041309 abstract "Rhizobium meliloti EFB1, a strain isolated from nodules of a plant growing in a salt marsh, modifies the production of extracellular polysaccharides in response to salt. Ionic and osmotic stress exert different modifications on the lipopolysaccharide as revealed by silver stain and the use of monoclonal antibodies (Lloret et al. 1995, Appl. Environ. Microbiol. 61:3701–3704). Futhermore, colonies grown in media containing 0.3 M NaCl, but not with non-ionic osmolite, show a decrease in mucoidy and produce forty percent less exopolysaccharides than when growing in media with no NaCl added. It has been previously shown that R. meliloti produces two types of exopolysaccharide: succinoglycan (EPS I) and galactoglucan (EPS II). Most genetic and physiological studies have been carried out in derivatives of strain SU47, which under normal growth conditions produces only EPS I, forming non-mucoid colonies. R. meliloti EFB1 forms very mucoid colonies suggesting that EPS II is produced under normal conditions and that its producction is severely reduced on salt-supplemented media. A transposon induced mutant, EFB107, is non-mucoid and shows the same colony morphology in both conditions. The mutant was found to be affected in a genetic region highly homologous to genes for EPS II production of R. meliloti Rm2011, expE genes (Becker et al. 1997, J. Bacteriol. 179:1375–1384). Quantification of the EPSs produced by EFB1 and EFB107 in media with and without salt demonstrated that EPS II production was diminished more than fifty percent in salt containing media. Despite the overall homology between expE genes in EFB1 and Rm2011, divergences where found in a AT rich strech upstream of the expE genes. A transcriptional fussion of that region with the promoterless lacZ gene demonstrated that it corresponded to the expE promoter. Promoter activity correlated with the observed phenotype of EFB1: expression was constitutive and high in normal media but growth phase dependent in salt-supplemented media. These results clearly show that the different EPS II production of EFB1 is regulated transcriptionaly." @default.
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- W2491041309 date "1998-01-01" @default.
- W2491041309 modified "2023-09-23" @default.
- W2491041309 title "Salt Regulates Exopolysaccharide Production in Rhizobium meliloti EFB1" @default.
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- W2491041309 doi "https://doi.org/10.1007/978-94-011-5159-7_322" @default.
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