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Extracellular polysaccharide composition, ex planta nitrogenase activity, and DNA homology in Rhizobium japonicum. 1984

T A Huber, and A K Agarwal, and D L Keister

The composition of the major acidic extracellular polysaccharide (EPS) of 25 strains of Rhizobium japonicum was determined. Eight strains synthesized an acidic EPS containing rhamnose and 4-O- methylglucuronic acid and were closely related according to DNA homology. These same strains also expressed high levels of ex planta nitrogenase activity. Sixteen strains produced an acidic EPS containing glucose, mannose, galacturonic acid, and galactose and were also related by DNA homology. These strains developed little or no nitrogenase activity under the experimental conditions employed.

UI MeSH Term Description Entries
D009591 Nitrogenase An enzyme system that catalyzes the fixing of nitrogen in soil bacteria and blue-green algae (CYANOBACTERIA). EC 1.18.6.1. Dinitrogenase,Vanadium Nitrogenase,Nitrogenase, Vanadium
D011135 Polysaccharides, Bacterial Polysaccharides found in bacteria and in capsules thereof. Bacterial Polysaccharides
D004269 DNA, Bacterial Deoxyribonucleic acid that makes up the genetic material of bacteria. Bacterial DNA
D012231 Rhizobium A genus of gram-negative, aerobic, rod-shaped bacteria that activate PLANT ROOT NODULATION in leguminous plants. Members of this genus are nitrogen-fixing and common soil inhabitants.
D013045 Species Specificity The restriction of a characteristic behavior, anatomical structure or physical system, such as immune response; metabolic response, or gene or gene variant to the members of one species. It refers to that property which differentiates one species from another but it is also used for phylogenetic levels higher or lower than the species. Species Specificities,Specificities, Species,Specificity, Species

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