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Structural and compositional features of bacterial cell samples and of lipopolysaccharide±protein complex isolated from the cell surface of the plant-growth-promoting rhizobacterium Azospirillum brasilense (wild-type strain Sp7) were characterised using Fourier transform (FT) Raman spectroscopy. The structural spectroscopic information obtained is analysed(More)
Elucidation of mechanisms of interaction of soil bacteria with metals is an urgent problem of soil microbiology [1]. This is primarily due to the fact that soil microorganisms are in constant and direct contact with various metal-containing components of the soil. The interaction of microorganisms with metals (including toxic metal compounds) plays a(More)
Fully unadenylylated glutamine synthetase (GS) from the endophytic bacterium Azospirillum brasilense Sp245 was isolated and purified. The enzyme was electrophoretically homogeneous and contained strongly bound metal ions, which could not be removed by dialysis. Mn2+, Mg2+, and Co2+ were found to be effective in supporting biosynthetic activity of the A.(More)
The diazotrophic endophyte Herbaspirillum seropedicae Z78 was shown to possess a capsule containing two high-molecular-weight glycolipids, one of which was of a lipopolysaccharide nature. These glycolipids differed considerably in the fatty acid composition of their lipid components. The polysaccharide moiety of these glycans was composed of glucose,(More)
Effect of the carbon source in the culture medium and of the growth phase on the composition and structure of the capsular polysaccharides (CPSs) and lipopolysaccharides (LPSs) of the bacterium Azospirillum brasilense Sp245 was studied. Growth with fructose resulted in an increased carbohydrate content in the CPSs, while long-term cultivation resulted in an(More)
Cultivation of the type strain Azospirillum lipoferum Sp59b in the presence of flavonoid quercetin induced modification of the structure of the bacterial lipopolysaccharide. Cultivation in the presence of the flavonoid was shown to result in altered serological characteristics of the bacteria, increased heterogeneity of the outer membrane lipopolysaccharide(More)
Lipopolysaccharides of six Azospirillum brasilense strains (SR50, SR80, SR88, SR109, SR111, SR115) and A. lipoferum SR 42 isolated from the rhizosphere of cereal plants of Saratov oblast, Russia and referred to serogroup II by serological analysis were studied. In the lipid A fatty acid composition, the lipopolysaccharides under study were similar to those(More)
We examined the ability of several Paenibacillus polymyxa strains to colonize wheat roots and the ability of P. polymyxa exoglycans to induce root hair deformation. For the first time, exopolysaccharides isolated from P. polymyxa were found to produce, with different intensities, various morphological changes in the root hairs of wheat seedlings, which are(More)
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