Abstract
The effect of NaCl on the growth rates and yields of 31 gram-negative, heterotrophic, marine bacteria was determined. The strains used were representative of aerobic genera (Alteromonas, Pseudomonas, Alcaligenes, Bdellovibrio) as well as genera comprised of facultative anaerobes (Beneckea, Photobacterium). Two media were used-the first, a medium designed for the cultivation of marine bacteria and, the second, a medium used for the cultivation of terrestrial strains. These two media differed in the concentrations of divalent cations; the terrestrial medium (TM) contained 2 mM Mg++ and 0.55 mM Ca++ while the marine medium (MM) contained 50 mM Mg++ and 10 mM Ca++. The amount of NaCl necessary for optimal growth varied in different strains and was usually considerably higher in TM (100 to 460 mM) than in MM (70 to 300 mM). Many strains which grew in MM and TM had a shorter generation time in the former than in the latter medium. In addition, four strains which grew well in MM usually failed to grow in TM. These results show that higher levels of divalent cations are either essential for growth or stimulate growth rate, indicating that for many marine strains a terrestrial medium modified by the addition of NaCl cannot support optimal growth. Fourteen terrestrial strains of the genera Pseudomonas, Alcaligenes, Acinetobacter, Salmonella, Aeromonas, and Vibrio did not have ionic requirements comparable to those of the marine strains. All of the terrestrial organisms grew in TM without added NaCl (0.068 mM Na+ was present as a contaminant). In some terrestrial organisms, growth was stimulated by the addition of NaCl, the highest stimulation being found in Vibrio cholerae. The optimal growth rates and yields for four strains of this species were observed at 2.5 to 5.0 mM NaCl while the growth rates and yields in TM with no added NaCl were 40 to 50% of the optimum.
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Abbreviations
- ATCC:
-
American Type Culture Collection
- GC:
-
guanine plus cytosine
- MM:
-
marine medium
- TM:
-
terrestrial medium
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Reichelt, J.L., Baumann, P. Effect of sodium chloride on growth of heterotrophic marine bacteria. Arch. Microbiol. 97, 329–345 (1974). https://doi.org/10.1007/BF00403071
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DOI: https://doi.org/10.1007/BF00403071