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J. Bacteriol., 11 1997, 6894-6901, Vol 179, No. 22
Copyright © 1997, American Society for Microbiology

Adaptation to nutrient starvation in Rhizobium leguminosarum bv. phaseoli: analysis of survival, stress resistance, and changes in macromolecular synthesis during entry to and exit from stationary phase

SH Thorne and HD Williams
Department of Biology, Imperial College of Science, Technology and Medicine, London, United Kingdom.

The nitrogen-fixing bacterium Rhizobium leguminosarum bv. phaseoli often has to survive long periods of starvation in the soil, when not in a useful symbiotic relationship with leguminous plants. We report that it can survive carbon, nitrogen, and phosphorus starvation for at least 2 months with little loss of viability. Upon carbon starvation, R. leguminosarum cells were found to undergo reductive cell division. During this period, they acquired the potential for long-term starvation-survival, levels of protein, DNA, and RNA synthesis were decreased to base levels, and pool mRNA was stabilized. The starved cells are ready to rapidly restart growth when nutrients become available. Upon addition of fresh nutrients, there is an immediate increase in the levels of macromolecular synthesis, pool mRNA destabilizes, and the cultures enter exponential growth within 5 to 8 h. The starved cells were cross-protected against pH, heat, osmotic, and oxidative shock. These results provide evidence for a general starvation response in R. leguminosarum similar to that previously found in other bacteria such as Escherichia coli and Vibrio sp.

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