Abstract
The colony-forming ability of long (3–9 months) incubated cystlike resting cells (CRC) of the nonspore-forming gram-positive bacteria Micrococcus luteus and Arthrobacter globiformis was studied in this work. The preservation of the CRC proliferative potential as assayed by plating on standard LB agar was shown to depend on the conditions of the formation of the dormant cells. In aged post-stationary cultures of micrococci and arthrobacters grown under carbon and phosphorus limitation the number of colony-forming units (CFU/ml) of CRC decreased in the course of 3–9 month incubation to the level of 106–107 CFU/ml. However, M. luteus CRC obtained under carbon and nitrogen limitation and A. globiformis CRC obtained under nitrogen limitation and starvation completely lost their ability to form colonies on standard solid medium after 4–6 months of incubation and turned into a ‘non-culturable’ (non-platable) state. In this case, the ratio of live cells in the population of M. luteus and A. globiformis ‘non-culturable’ CRCs (determined by the Live/Dead staining test) was 10–44% of the total cell number. To study the possible preservation of proliferative potential in non-platable CRCs, various methods of their reactivation were applied. Although preincubation of CRC suspensions in a buffer solution of 0.1 M K2HPO4 (pH 7.4) or in the presence of lysozyme (1 or 10 μg/ml) resulted in increased numbers of live cells (determined by the Live/Dead test) or in disruption of the cell conglomerates, it did not increase considerably the CFU titer on LB medium. Variations in the medium composition, such as addition of sodium pyruvate as an antioxidant or dilution of the medium, promoted the formation of macrocolonies by a small portion of nonplateable CRC of M. luteus (50−80 CFU/ml), whereas the number of the cells capable of microcolony formation (mCFU) was 1.8–6.8 × 105 mCFU/ml, exceeding the CFU titers by four orders of magnitude. The application of semisolid agar and the most probable number (MPN) method was the most efficient for determination of the mCFU titer, and an almost complete reversion of ‘non-culturable’ micrococcal CRCs to microcolony formation was observed (up to 2.3 × 107 mCFU/ml). The usefulness of diluted complete media for the restoration of the colony-forming ability of the dormant forms was confirmed in experiments with ‘nonculturable’ CRCs of A. globiformis. The development of special procedures and methods for determining actively proliferating cells not detected by ordinary methods is of great importance for advanced monitoring studies.
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Original Russian Text © A.L. Mulyukin, E.V. Demkina, N.A. Kryazhevskikh, N.E. Suzina, L.I. Vorob’eva, V.I. Duda, V.F. Galchenko, G.I. El-Registan, 2009, published in Mikrobiologiya, 2009, Vol. 78, No. 4, pp. 456–468.
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Mulyukin, A.L., Demkina, E.V., Kryazhevskikh, N.A. et al. Dormant forms of Micrococcus luteus and Arthrobacter globiformis not platable on standard media. Microbiology 78, 407–418 (2009). https://doi.org/10.1134/S0026261709040031
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DOI: https://doi.org/10.1134/S0026261709040031