Role of Na super(+) in growth, respiration and membrane transport in the marine bacterium Pseudomonas doudoroffii) 70

As the Na super(+) concentration in the medium was decreased below or increased above 200 to 300 mM the lag phase of growth of Pseudomonas doudoroffii) 70 progressively increased in a minimal medium containing either acetate, glutamate or succinate as the carbon and energy source. At 10 mM Na super(...

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Bibliographic Details
Published in:Archives of microbiology 1989-01, Vol.153 (1), p.64-71
Main Authors: Wisse, G A, MacLeod, R A
Format: Article
Language:English
Subjects:
Marine
Pseudomonas doudoroffii
Online Access:Get full text
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Summary:As the Na super(+) concentration in the medium was decreased below or increased above 200 to 300 mM the lag phase of growth of Pseudomonas doudoroffii) 70 progressively increased in a minimal medium containing either acetate, glutamate or succinate as the carbon and energy source. At 10 mM Na super(+) the lag phase was longest with succinate, shorter with glutamate and shortest with acetate. No growth occurred without Na super(+). Maximum rates of exponential growth occurred at 20 mM and 50-100 mM Na super(+) with acetate and succinate respectively, and remained relatively constant as the Na super(+) concentration was increased to 500 mM. With glutamate, maximum rate of exponential growth occurred at 200 mM Na super(+) and decreased progressively as the Na super(+) concentration was decreased or further increased. Na super(+) was required for the transport of the substrates. Transport rates were maximum for acetate and glutamate at 200 mM Na super(+) and for succinate at 200 to 300 mM. Above and below these concentrations transport rates went down.
ISSN:0302-8933