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Appl Environ Microbiol. 1984 September; 48(3): 486-490
Copyright © 1984, American Society for Microbiology. All Rights Reserved.

Genetic Adaptation to Elevated Carbon Dioxide Atmospheres by Pseudomonas-Like Bacteria Isolated from Rock Cod (Sebastes spp.)

Andrew R. Johnson and David M. Ogrydziak^*

Institute of Marine Resources, University of California, Davis, California 95616

ABSTRACT

The microorganisms on rock cod fillets stored in a modified atmosphere (MA; 80% CO₂-20% air) at 4°C for 21 days were isolated. Only Lactobacillus sp. (71 to 87%) and tan-colored Pseudomonas sp.-like isolates (TAN isolates) were found. The TAN isolates grew more slowly in MA than in air at 8°C. When TAN isolates were grown in air at 8°C and then transferred to MA at 8°C, there was an initial decline in viable counts for 10 to 30 h followed by exponential growth. During this exponential growth phase in MA, the growth rates of the TAN isolates from MA-stored fish were significantly greater than those of the TAN isolates from fresh fish. When a TAN isolate from fresh fish was grown under MA for 21 days, it then grew as rapidly under MA as isolates from MA-stored fish. These results suggest that the TAN isolates genetically adapt to high levels of CO₂.

^* Corresponding author.

Present address: Yoplait U.S.A., Reed City, MI 49677.

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