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Adaptation of Mycoplasma gallisepticum to unfavorable growth conditions: Changes in morphological and physiological characteristics

Author:
Chernov, V. M., Chernova, O. A., Gorshkov, O. V., Muzykantov, A. A., Shaimardanova, G. F., Pel'nikevich, A. D., Margulis, A. B., Kolpakov, A. I., Il'inskaya, O. N.
Source:
Microbiology 2008 v.77 no.6 pp. 691-694
ISSN:
0026-2617
Subject:
Escherichia coli, Mycoplasma gallisepticum, genome, starvation, vegetative cells
Abstract:
Adaptation of Mycoplasma gallisepticum to unfavorable growth conditions results in altered morphological and physiological characteristics of the cells. M. gallisepticum populations in a complete nutrient medium contain pear-shaped vegetative cells ( d ~ 0.3 μm; l ~ 0.8 μm) with pronounced polar and cytoskeletonlike structures. Such mycoplasma cells are able to induce damage in a bacterial genome, causing an SOS response of the test strain (Escherichia coli PQ37). In a starvation medium, M. gallisepticum produces nanoforms, small coccoid cells (d ~ 0.15-0.2 μm) without either polar or cytoskeleton-like structures. Unlike vegetative cells, nanoforms do not induce genome damage. Alleviation of unfavorable growth conditions results in a reversion of nanoforms to vegetative cells.
Agid:
277550