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. 1997 Jul;63(7):2686–2694. doi: 10.1128/aem.63.7.2686-2694.1997

Changes in Cellular States of the Marine Bacterium Deleya aquamarina under Starvation Conditions

F Joux, P Lebaron, M Troussellier
PMCID: PMC1389201  PMID: 16535646

Abstract

In this study, we have used different fluorescent dyes and techniques to characterize the heterogeneity and changes of the physiological states encountered by the marine bacterium Deleya aquamarina during a 92-day starvation survival experiment at 20 and 5(deg)C. Changes of physiological states were investigated on a single-cell basis by flow cytometry and epifluorescence microscopy in conjunction with fluorescent dyes specific for various cellular functions and constituents. Heterogeneities within populations with regard to functions (respiration, substrate responsiveness, enzymatic activity, and cytoplasmic membrane permeability), constituent (DNA), and cell volume (light scatter) were compared to the evolution of viable plate counts (CFU). At 20(deg)C, CFU changes were divided into three stages corresponding to stability up to day 13 followed by a rapid drop between days 13 and 42 and then by stabilization at a level of 10 to 20% during the remaining survival period. Most of the cellular fractions showing a metabolic activity were close to the evolution of the culturable cells, suggesting the absence of viable but nonculturable cells. On the other hand, cells with selective cytoplasmic membrane permeability but without any metabolic activity were observed, and this stage was followed by DNA alteration occurring at different rates after the loss of membrane cytoplasmic permeability. We observed a greater maintenance of culturability, physiological functions, DNA, and cellular volume at the lower temperature. These results have different ecological implications from both methodological and conceptual viewpoints.

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Selected References

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