Halotolerance of the Phototrophic Bacterium Rhodobacter capsulatus E1F1 Is Dependent on the Nitrogen Source.

Applied and Environmental Microbiology
M I IgenoF J Caballero

Abstract

Phototrophic growth of the moderate halotolerant Rhodobacter capsulatus strain E1F1 in media containing up to 0.3 M NaCl was dependent on the nitrogen source used. In these media, increased growth rates and growth levels were observed in the presence of reduced nitrogen sources such as ammonium and amino acids. When the medium contained an oxidized nitrogen source (dinitrogen or nitrate), increases in salinity severely inhibited phototrophic growth. However, the addition of glycine betaine promoted halotolerance and allowed the cells to grow in 0.2 M NaCl. Inhibition of diazotrophic growth by salinity was due to a decrease in nitrogenase activity which was no longer synthesized and reversibly inactivated, both effects being alleviated by the addition of glycine betaine. In R. capsulatus E1F1, inhibition of cell growth in nitrate by salt was due to a rapid inhibition of nitrate uptake, which led to a long-term decrease in nitrate reductase activity, probably caused by repression of the enzyme. Addition of glycine betaine immediately restored nitrate uptake, but the recovery of nitrate reductase activity required several hours. Neither ammonium uptake nor ammonium assimilation through the glutamine synthetase-glutamate synthase p...Continue Reading

References

Apr 27, 1978·Archives of Microbiology·W G Zumft, F Castillo
Oct 1, 1978·Journal of Bacteriology·J MeyerP M Vignais
Jan 1, 1991·Annual Review of Microbiology·L N Csonka, A D Hanson
Jan 1, 1990·Journal of Bacteriology·T AbeeW N Konings
Jul 1, 1988·Journal of Bacteriology·L T SmithD Le Rudulier
Oct 1, 1984·Journal of Bacteriology·J F Imhoff, F Rodriguez-Valera
Sep 24, 1982·Science·P H YanceyG N Somero
Jan 1, 1993·Journal of Bacteriology·G GouesbetC Blanco
Sep 1, 1990·Applied and Environmental Microbiology·M A MadkourG M Smith
Mar 1, 1993·Applied and Environmental Microbiology·T A FernandesS K Apte
Jan 1, 1989·Plant Physiology·B R ReddyJ Thomas

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Citations

Jan 15, 2016·Applied Microbiology and Biotechnology·Alessandra AdessiRoberto De Philippis
Aug 20, 2014·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Hua Z LinPing S Yang
Aug 24, 2017·Microbial Biotechnology·Alan J StephenLynne E Macaskie

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