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1. (Article ID: 3990)
 
Boyko AS, Konnova SA, Fedonenko YP, Zdorovenko EL, Smol'kina ON, Kachala VV, Ignatov VV
Structural and functional peculiarities of the lipopolysaccharide of Azospirillum brasilense SR55, isolated from the roots of Triticum durum
Microbiological Research 166(7) (2011) 585-593
 

Azospirillum brasilense SR55, isolated from the rhizosphere of Triticum durum, was classified as serogroup II on the basis of serological tests. Such serogroup affiliation is uncharacteristic of wheat-associated Azospirillum species. The lipid A of A. brasilense SR55 lipopolysaccharide contained 3-hydroxytetradecanoic, 3-hydroxyhexadecanoic, hexadecanoic and octadecenoic fatty acids. The structure of the lipopolysaccharide's O polysaccharide was established, with the branched octasaccharide repeating unit being represented by l-rhamnose, l-3-O-Me-rhamnose, d-galactose and d-glucuronic acid. The SR55 lipopolysaccharide induced deformations of wheat root hairs. The lipopolysaccharide was not involved in bacterial cell aggregation, but its use to pretreat wheat roots was conducive to cell adsorption. This study shows that Azospirillum bacteria can utilise their own lipopolysaccharide as a carbon source, which may give them an advantage in competitive natural environments.

Lipopolysaccharide, Azospirillum brasilense, plant-microbe interaction

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2. (Article ID: 4844)
 
Fedonenko YP, Sigida EN, Konnova SA, Ignatov VV
Structure and serology of O-antigens of nitrogen-fixing rhizobacteria of the genus Azospirillum
Russian Chemical Bulletin = Izvestiia Akademii nauk. Seriia khimicheskaia 64(5) (2015) 1024-1031
 

The review presents a discussion of the published data of 2002 to 2014 dealing with structural studies of O-specific polysaccharides, representatives of the Azospirillum diazotrophic rhizobacteria, summarizing the results of a series of authors? studies. Some general structures incorporated in O-specific polysaccharides responsible for classification of bacterial cultures into serogroups on the basis of immunochemical studies were characterized. The structures of O-specific polysaccharides of seven azospirillum strains identical to those of previously studied strains are presented in this review for the first time.

lipopolysaccharides, O-specific polysaccharides, Structures, Azospirillum, O-antigenic determinants

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