title: Lipopolysaccharides of Pseudomonas spp. that stimulate plant growth: composition and use for strain identification.
abstract: The outer membrane proteins of a series of fluorescent, root-colonizing, plant-growth-stimulating Pseudomonas spp. having been characterized (L. A. de Weger et al., J. Bacteriol. 165:585-594, 1986), the lipopolysaccharides (LPSs) of these strains were examined. The chemical composition of the LPSs of the three best-studied plant-growth-stimulating Pseudomonas strains WCS358, WCS361, and WCS374 and of P. aeruginosa PAO1 as a reference strain was determined and appeared to differ from strain to strain. The 2,6-dideoxy-2-aminosugar quinovasamine was the most abundant compound in the LPS of strain WCS358. Analysis by sodium dodecyl sulfate-polyacrylamide gel electrophoresis of purified LPS and of proteinase K-treated cell envelopes revealed ladderlike patterns for most of these strains. These patterns were not substantially influenced by differences in culture conditions. Analysis of proteinase K-treated cell envelopes of 24 root-colonizing Pseudomonas spp. revealed a unique band pattern for each strain, suggesting a great variety in the LPS structures present in these root colonizers. Therefore, electrophoretic analysis of LPS can be used for characterization and identification of the fluorescent root-colonizing Pseudomonas strains.
mesh_terms: D004591:Electrophoresis, Polyacrylamide Gel; D005944:Glucosamine / Q000031:analogs & derivatives / Q000032:analysis; D008070:Lipopolysaccharides / Q000032:analysis* / Q000302:isolation & purification; D011549:Pseudomonas / Q000032:analysis* / Q000145:classification / Q000254:growth & development; D011198:Solanum tuberosum / Q000254:growth & development / Q000382:microbiology
chemical_list: D008070:Lipopolysaccharides; D005944:Glucosamine; C009149:6-desoxy-D-glucosamine