Role of Denitrification in Selenite Reduction by with the Formation of Selenium Nanoparticles.

Background: Many bacteria are capable of reducing selenium oxyanions, primarily selenite (SeO), in most cases forming selenium(0) nanostructures. The mechanisms of these transformations may vary for different bacterial species and have so far not yet been clarified in detail. Bacteria of the genus , including ubiquitous phytostimulating rhizobacteria, are widely studied and have potential for agricultural biotechnology and bioremediation of excessively seleniferous soils, as they are able to reduce selenite ions.

Chromosomal gene of hybrid multisensor histidine kinase is involved in motility regulation in the rhizobacterium Azospirillum baldaniorum Sp245 under mechanical and water stress.

Azospirillum alphaproteobacteria, which live in the rhizosphere of many crops, are used widely as biofertilizers. Two-component signal transduction systems (TCSs) mediate the bacterial perception of signals and the corresponding adjustment of behavior facilitating the adaptation of bacteria to their habitats. In this study, we obtained the A.

Plasmid gene for putative integral membrane protein affects formation of lipopolysaccharide and motility in Azospirillum brasilense Sp245.

The bacterium Azospirillum brasilense can swim and swarm owing to the work of polar and lateral flagella. Its major surface glycopolymers consist of lipopolysaccharides (LPS) and Calcofluor-binding polysaccharides (Cal phenotype). Motility and surface glycopolymers are important for the interactions of plant-associated bacteria with plants.

Plasmid gene AZOBR_p60126 impacts biosynthesis of lipopolysaccharide II and swarming motility in Azospirillum brasilense Sp245.

The facultative plant endophyte Azospirillum brasilense Sp245 synthesizes two high-molecular-weight lipopolysaccharides, LPSI and LPSII, which comprise identical d-rhamnan O-polysaccharides and, presumably different core oligosaccharides. Previously, using random insertion mutagenesis, we constructed the LpsII mutant KM139 of strain Sp245 that possessed an Omegon-Km insertion in plasmid AZOBR_p6. Here, we found that in KM139, Omegon-Km disrupted the coding sequence AZOBR_p60126 for a putative glycosyltransferase related to mannosyltransferases and rhamnosyltransferases.

Polar flagellum of the alphaproteobacterium Azospirillum brasilense Sp245 plays a role in biofilm biomass accumulation and in biofilm maintenance under stationary and dynamic conditions.

Bacteria Azospirillum brasilense may swim and swarm owing to the rotation of a constitutive polar flagellum (Fla) and inducible lateral flagella (Laf). They also construct sessile biofilms on various interfaces. As compared to the wild-type strain Sp245, the previously characterized Fla Laf flhB1 mutant Sp245.

Restoration of polar-flagellum motility and biofilm-forming capacity in the mmsB1 mutant of the alphaproteobacterium Azospirillum brasilense Sp245 points to a new role for a homologue of 3-hydroxyisobutyrate dehydrogenase.

The bacterium Azospirillum brasilense can swim and swarm owing to the rotation of a constitutive polar flagellum (Fla) and inducible lateral flagella, respectively. They also form biofilms on various interfaces. Experimental data on flagellar assembly and social behaviours in these bacteria are scarce.

Plasmid AZOBR_p1-borne fabG gene for putative 3-oxoacyl-[acyl-carrier protein] reductase is essential for proper assembly and work of the dual flagellar system in the alphaproteobacterium Azospirillum brasilense Sp245.

Azospirillum brasilense can swim and swarm owing to the activity of a constitutive polar flagellum (Fla) and inducible lateral flagella (Laf), respectively. Experimental data on the regulation of the Fla and Laf assembly in azospirilla are scarce. Here, the coding sequence (CDS) AZOBR_p1160043 (fabG1) for a putative 3-oxoacyl-[acyl-carrier protein (ACP)] reductase was found essential for the construction of both types of flagella.

Chromosomal flhB1 gene of the alphaproteobacterium Azospirillum brasilense Sp245 is essential for correct assembly of both constitutive polar flagellum and inducible lateral flagella.

Azospirillum brasilense has the ability of swimming and swarming motility owing to the work of a constitutive polar flagellum and inducible lateral flagella, respectively. The interplay between these flagellar systems is poorly understood. One of the key elements of the flagellar export apparatus is the protein FlhB.

Spontaneous Super-Swarming Derivatives of Azospirillum brasilense Sp245 have Different DNA Profiles and Behavior in the Presence of Various Nitrogen Sources.

Azospirillum brasilense swims in liquid environments and swarms in semisolid media. Five variants of A. brasilense Sp245, Sp245.

Effect of genomic rearrangement on heavy metal tolerance in the plant-growth-promoting rhizobacterium Azospirillum brasilense Sp245.

A derivative of Azospirillum brasilense Sp245, Sp245.5, which spontaneously lost 85 and 120 MDa replicons upon the formation of a new megaplasmid, has been shown to produce a novel lipopolysaccharide and to lose Calcofluor-binding polysaccharides. As compared to Sp245, the derivative displays notably increased heavy metal tolerance.

Changes in Azospirillum brasilense motility and the effect of wheat seedling exudates.

The rhizobacterium Azospirillum brasilense Sp245 swims, swarms (Swa(+) phenotype) or, very rarely, migrates with the formation of granular macrocolonies (Gri(+) phenotype). Our aims were (i) to identify Sp245 mutants that swarm faster than the parent strain or differ from it in the mode of spreading and (ii) to compare the mutants' responses to wheat seedling exudates. In isotropic liquid media, the swimming speeds of all motile A.