Performance of stress resistant variants of Listeria monocytogenes in mixed species biofilms with Lactobacillus plantarum.
Population diversity and the ability to adapt to changing environments allow Listeria monocytogenes to grow and survive under a wide range of environmental conditions. In this study, we aimed to evaluate the performance of a set of acid resistant L. monocytogenes variants in mixed-species biofilms with Lactobacillus plantarum as well as their benzalkonium chloride (BAC) resistance in these biofilms. L. monocytogenes LO28 wild type and acid resistant variants were capable of forming mixed biofilms with L. plantarum at 20°C and 30°C in BHI supplemented with manganese and glucose. Homolactic fermentation of glucose by L. plantarum created an acidic environment with pH values below the growth boundary of L. monocytogenes. Some of the variants were able to withstand the low pH in the mixed biofilms for a longer time than the WT and there were clear differences in survival between the variants which could not be correlated to (lactic) acid resistance alone. Adaptation to mild pH of liquid cultures during growth to stationary phase increased the acid resistance of some variants to a greater extent than of others, indicating differences in adaptive behaviour between the variants. Two variants that showed a high level of acid adaptation when grown in liquid cultures, showed also better performance in mixed species biofilms. There were no clear differences in BAC resistance between the wild type and variants in mixed biofilms. It can be concluded that acid resistant variants of L. monocytogenes show diversity in their adaptation to acidic conditions and their capacity to survive in mixed cultures and biofilms with L. plantarum.
Top Institute Food and Nutrition, P.O. Box 557, 6700 AN Wageningen, The Netherlands; Laboratory of Food Microbiology, Wageningen University, P.O. Box 17, 6700 AA Wageningen, The Netherlands.
Karin I
KI
Metselaar
Top Institute Food and Nutrition, P.O. Box 557, 6700 AN Wageningen, The Netherlands; Laboratory of Food Microbiology, Wageningen University, P.O. Box 17, 6700 AA Wageningen, The Netherlands.
Paula
P
Saá Ibusquiza
Laboratory of Food Microbiology, Wageningen University, P.O. Box 17, 6700 AA Wageningen, The Netherlands.
Angela R
AR
Ortiz Camargo
Laboratory of Food Microbiology, Wageningen University, P.O. Box 17, 6700 AA Wageningen, The Netherlands.
Myriam
M
Krieg
Top Institute Food and Nutrition, P.O. Box 557, 6700 AN Wageningen, The Netherlands; Laboratory of Food Microbiology, Wageningen University, P.O. Box 17, 6700 AA Wageningen, The Netherlands.
Marcel H
MH
Zwietering
Laboratory of Food Microbiology, Wageningen University, P.O. Box 17, 6700 AA Wageningen, The Netherlands.
Heidy M W
HM
den Besten
Top Institute Food and Nutrition, P.O. Box 557, 6700 AN Wageningen, The Netherlands; Laboratory of Food Microbiology, Wageningen University, P.O. Box 17, 6700 AA Wageningen, The Netherlands. Electronic address: tjakko.abee@wur.nl.
Tjakko
T
Abee
D000143:Acids / Q000494:pharmacology; D000222:Adaptation, Physiological / Q000502:physiology*; D001548:Benzalkonium Compounds / Q000494:pharmacology*; D018441:Biofilms / Q000187:drug effects / Q000254:growth & development*; D024881:Drug Resistance, Bacterial; D005506:Food Contamination; D048191:Lactiplantibacillus plantarum / Q000187:drug effects / Q000254:growth & development*; D008089:Listeria monocytogenes / Q000187:drug effects / Q000254:growth & development*
D000143:Acids; D001548:Benzalkonium Compounds
Acid adaptation; Acid resistance; Benzalkonium chloride; Growth history; Persisters; Population diversity