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J Bacteriol. 1968 January; 95(1): 169-173
Copyright © 1968 American Society for Microbiology. All Rights Reserved.

Salinity Effect on the Maximal Growth Temperature of Some Bacteria Isolated from Marine Environments¹

^a Department of Microbiology, Oregon State University, Corvallis, Oregon 97331
Department of Oceanography, Oregon State University, Corvallis, Oregon 97331

ABSTRACT

Salinity of the growth medium was found to have a marked effect on the maximal growth temperature of four bacteria isolated from marine sources. Vibrio marinus MP-1 had a maximal growth temperature of 21.2 C at a salinity of 35% and a maximal growth temperature of 10.5 C at a salinity of 7%, the lowest salinity at which it would grow. This effect was shown to be due to the presence of various cations in the medium. The order of effectiveness of cations in restoring the normal maximal growth temperature, when added to dilute seawater, was Na⁺ > Li⁺ > Mg⁺⁺ > K⁺ > Rb⁺ > NH₄⁺. The anions tested, with the exception of SO₄=, had no marked effect on the maximal growth temperature response. In a completely defined medium, the highest maximal growth temperature was 20.0 C at 0.40 M NaCl. A decrease in the maximal growth temperature was observed at both low and high concentrations of NaCl.

¹ Published as technical paper no. 2370, Oregon Agricultural Experiment Station.

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