In vitro expression of nitrogenase activity in Parasponia-Rhizobium strain ANU 289. 1983

S S Mohapatra, and G L Bender, and J Shine, and B G Rolfe, and P M Gresshoff

Rhizobium strain ANU 289 derepressed nitrogenase activity under defined in vitro conditions. Acetylene reduction was detected both in agar and liquid stationary culture. The strain is capable of nitrogen-fixing nodulation of legumes [such as siratro (Macroptilium atropurpureum Urb] as well as the non-legumes Parasponia andersonii and P. rugosa. Nitrogenase activity as high as 40-70 nmol C2H4 per mg protein after 7 days of incubation was detected. Strain ANU 289 was similar to Rhizobium strains 32 H1 and CB 756 with regard to oxygen requirement in the gas phase for development of nitrogenase activity between 0 and 10% O2, but showed increased sensitivity to oxygen repression at 20% O2. Strain ANU 289 also showed pronounced sensitivity to exogenous glutamine compared to strains 32 H1 and CB 756.

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
D010944 Plants Multicellular, eukaryotic life forms of kingdom Plantae. Plants acquired chloroplasts by direct endosymbiosis of CYANOBACTERIA. They are characterized by a mainly photosynthetic mode of nutrition; essentially unlimited growth at localized regions of cell divisions (MERISTEMS); cellulose within cells providing rigidity; the absence of organs of locomotion; absence of nervous and sensory systems; and an alternation of haploid and diploid generations. It is a non-taxonomical term most often referring to LAND PLANTS. In broad sense it includes RHODOPHYTA and GLAUCOPHYTA along with VIRIDIPLANTAE. Plant
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.
D013559 Symbiosis The relationship between two different species of organisms that are interdependent; each gains benefits from the other or a relationship between different species where both of the organisms in question benefit from the presence of the other. Endosymbiosis,Commensalism,Mutualism

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