Abstract
Latent period, burst time, and burst size, kinetic parameters of phage infection characteristic of a given phage/host system, have been measured for a wide variety of lactic acid bacteria. However, most studies to date were conducted in optimal growth conditions of host bacteria and did not consider variations due to changes in external factors. In this work, we determined the effect of temperature, pH, and starvation on kinetic parameters of phages infecting Lactobacillus paracasei, Lactobacillus plantarum, and Leuconostoc mesenteroides. For kinetics assessment, one-step growth curves were carried out in MRS broth at optimal conditions (control), lower temperature, pH 6.0 and 5.0 (MRS6 and MRS5, respectively), or in medium lacking carbon (MRSN) or nitrogen (MRSC) sources. Phage infection was progressively impaired as environmental conditions were modified from optimal. At lower temperature or pH, infection was delayed, as perceived by longer latent and burst times. Burst size, however, was lower, equal or higher than for controls, but this effect was highly dependent on the particular phage–host system studied. Phage infection was strongly inhibited in MRSC, but only mildly impaired in MRSN. Nevertheless, growth of all the bacterial strains tested was severely compromised by starvation, without significant differences between MRSC and MRSN, indicating that nitrogen compounds are specifically required for a successful phage infection, beyond their influence on bacterial growth.
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Acknowledgements
This work was supported by the Consejo Nacional de Investigaciones CientÃficas y Técnicas (CONICET; Project PIP 112-201201-00046; Argentina) and by the Universidad Nacional del Litoral (UNL; Project CAI+D PI 501-201101-00039; Argentina).
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Zaburlin, D., Quiberoni, A. & Mercanti, D. Changes in Environmental Conditions Modify Infection Kinetics of Dairy Phages. Food Environ Virol 9, 270–276 (2017). https://doi.org/10.1007/s12560-017-9296-2
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DOI: https://doi.org/10.1007/s12560-017-9296-2