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. 1994 Sep;60(9):3284–3291. doi: 10.1128/aem.60.9.3284-3291.1994

Influence of Viable Cells on the Resuscitation of Dormant Cells in Micrococcus luteus Cultures Held in an Extended Stationary Phase: the Population Effect

Tatyana V Votyakova 1,†, Arseny S Kaprelyants 1,†, Douglas B Kell 1,*
PMCID: PMC201800  PMID: 16349381

Abstract

A high proportion of Micrococcus luteus cells in cultures which had been starved for 3 to 6 months lost the ability to grow and form colonies on agar plates but could be resuscitated from their dormancy by incubation in an appropriate liquid medium (A. S. Kaprelyants and D. B. Kell, Appl. Environ. Microbiol. 59:3187-3196, 1993). In the present work, such cultures were studied by both flow cytometry and conventional microbiological methods and were found to contain various numbers of viable cells. Pretreatment of such cultures with penicillin G, and subsequent dilution, was used to vary this number. When the initial number of colony-forming cells per 30-ml flask was approximately nine (±five) or more, resuscitation of 10 to 40% of the cells, and thus culture growth, was observed. The lag period before the appearance of a population of cells showing significant accumulation of the fluorescent dye rhodamine 123 (i.e., of cells with measurable membrane energization) decreased from 70 to 27 h when the number of viable cells was increased from 30 to 105 per flask, while the lag period before an observable increase in the number of colony-forming cells occurred was almost constant (at some 20 h). Provided there were more than nine (±five) initially viable cells per flask, the number of initially viable cells did not affect the final percentage of resuscitable cells in the culture. The lag period could be ascribed in part to the time taken to restore the membrane permeability barrier of starved cells during resuscitation, as revealed by flow cytometric assessment of the uptake of the normally membrane-impermeant fluorescent DNA stain PO-PRO-3 {4-[3-methyl-2, 3-dihydro-(benzo-1, 3-oxazole)-2-methylidene]-1-(3′-trimethylammonium propyl)-pyridinium diiodide}. Although cell populations which contained fewer than nine ±five viable cells per flask failed to grow, 4 to 20% of the cells (of 1.2 X 106) were able to accumulate rhodamine 123 after 80 to 100 h of incubation, showing the ability of a significant number of the cells in the population at least to display “metabolic resuscitation.” Resuscitation and cell growth under such conditions were favored by the use of a 1:1 mixture of fresh lactate medium and supernatant from late-logarithmic-phase M. luteus cultures as the resuscitation medium. We conclude that the presence of a small fraction of viable cells at the onset of resuscitation facilitates the recovery of the majority of the remaining (dormant) cells. The cell density dependence of the kinetics, or population effect, suggests that this recovery is due to the excretion of some factor(s) which promoted the transition of cells from a state in which they are incapable of growth and division to one in which they are capable of colony formation.

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Selected References

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