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An in vitro study of Lactobacillus plantarum strains for the presence of plantaricin genes and their potential control of the table olive microbiota

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Abstract

Sixteen Lactobacillus plantarum strains, isolated from fermented table olives, were studied for the presence and expression of genes involved in the production of bacteriocins, pheromones and other peptides. The presence of 13 genes that belong to pln locus was monitored, while for the study of gene expression, producer strains were cultured in growth medium with variant salinity (0, 4, 6, and 8 % NaCl) and pH (3.5, 4.0, 4.5, and 6.4). The effect of producer strain on the growth of indicator microorganisms was evaluated using a well diffusion assay. In parallel, Real-Time PCR was employed to monitor the genetic expression of plnE/F and plnJ/K genes for strains that revealed the highest antimicrobial activity. The well diffusion assay showed that the growth of Lactobacillus pentosus was inhibited by six L. plantarum strains when cultured on control medium (0 % NaCl, pH 6.4). Moreover, when the same growth medium was supplemented with 4 and 6 % NaCl, the growth of L. pentosus was inhibited by three and two L. plantarum strains, respectively. Growth of L. pentosus was favoured when L. plantarum strains were cultured on a growth medium with lowered pH (3.5, 4.0, and 4.5). No inhibition of pathogens was observed, but in a few cases, inhibition of Aureobasidium pullulans was detected. The Real-Time PCR assay revealed that the expression of genes was dependent on producer strains and growth phase, whereas inhibition of indicator strains was enhanced in earlier stages of the growth curve in the presence of NaCl, although similar counts were obtained.

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Acknowledgments

The present study was funded by the European Commission under the 7th Framework Programme PROBIOLIVES (http://www.probiolives.eu). The information in this document reflects only the author’s views and the Community is not liable for any use that may be made of the information contained therein.

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Authors and Affiliations

  1. Laboratory of Microbiology and Biotechnology of Foods, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece

    Agapi I. Doulgeraki

  2. Department of Food Science and Technology, Laboratory of Food Microbiology and Biotechnology, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece

    Nikolaos Paraskevopoulos, George John E. Nychas & Efstathios Z. Panagou

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  1. Agapi I. Doulgeraki
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  2. Nikolaos Paraskevopoulos
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  3. George John E. Nychas
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  4. Efstathios Z. Panagou
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Correspondence to Agapi I. Doulgeraki.

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Doulgeraki, A.I., Paraskevopoulos, N., Nychas, G.J.E. et al. An in vitro study of Lactobacillus plantarum strains for the presence of plantaricin genes and their potential control of the table olive microbiota. Antonie van Leeuwenhoek 103, 821–832 (2013). https://doi.org/10.1007/s10482-012-9864-2

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  • DOI: https://doi.org/10.1007/s10482-012-9864-2

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