title: Symbiotic properties and first analyses of the genomic sequence of the fast growing model strain Sinorhizobium fredii HH103 nodulating soybean.
abstract: Glycine max (soybean) plants can be nodulated by fast-growing rhizobial strains of the genus Sinorhizobium as well as by slow-growing strains clustered in the genus Bradyrhizobium. Fast-growing rhizobia strains with different soybean cultivar specificities have been isolated from Chinese soils and from other geographical regions. Most of these strains have been clustered into the species Sinorhizobium fredii. The S. fredii strain HH103 was isolated from soils of Hubei province, Central China and was first described in 1985. This strain is capable to nodulate American and Asiatic soybean cultivars and many other different legumes and is so far the best studied fast-growing soybean-nodulating strain. Additionally to the chromosome S. fredii HH103 carries five indigenous plasmids. The largest plasmid (pSfrHH103e) harbours genes for the production of diverse surface polysaccharides, such as exopolysaccharides (EPS), lipopolysaccharides (LPS), and capsular polysaccharides (KPS). The second largest plasmid (pSfrHH103d) is a typical symbiotic plasmid (pSym), carrying nodulation and nitrogen fixation genes. The present mini review focuses on symbiotic properties of S. fredii HH103, in particular on nodulation and surface polysaccharides aspects. The model strain S. fredii HH103 was chosen for genomic sequencing, which is currently in progress. First analyses of the draft genome sequence revealed an extensive synteny between the chromosomes of S. fredii HH103 and Rhizobium sp. NGR234.
authors: Departamento de Microbiología, Universidad de Sevilla, Sevilla, Spain.
authors: Isabel
authors: I
authors: Margaret
authors: Anke
authors: A
authors: Becker
authors: Jochen
authors: J
authors: Blom
authors: Ildefonso
authors: I
authors: Bonilla
authors: Alexander
authors: A
authors: Goesmann
authors: Michael
authors: M
authors: Göttfert
authors: Javier
authors: J
authors: Lloret
authors: Virginie
authors: V
authors: Mittard-Runte
authors: Christian
authors: C
authors: Rückert
authors: José E
authors: JE
authors: Ruiz-Sainz
authors: José María
authors: JM
authors: Vinardell
authors: Stefan
authors: S
authors: Weidner
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics / Q000502:physiology; D016680:Genome, Bacterial; D023281:Genomics / Q000379:methods; D042181:Sinorhizobium fredii / Q000235:genetics / Q000502:physiology*; D013025:Glycine max / Q000382:microbiology; D013559:Symbiosis / Q000235:genetics / Q000502:physiology
chemical_list: D001426:Bacterial Proteins