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Exposure of Escherichia coli to 0.8 M NaCl caused a rapid and large decrease in colony-forming activity. When such osmotically upshocked cells were exposed to betaine, colony-forming activity was restored. Betaine was able to restore colony-forming activity even when chloramphenicol inhibited protein synthesis. Thus, restoration was not the result of cell turnover. The cells were not killed by exposure to 0.8 M NaCl, because during exposure they accumulated ATP intracellularly. Betaine treatment caused this cellular ATP to decrease to a lower level. This work may provide the foundation for a simple plating procedure to quantitatively detect nonculturable E. coli in ocean beach recreational waters.

Restoration of colony-forming activity in osmotically stressed Escherichia coli by betaine