Abstract

MAYRHOFER, S. et al. Suitability of different PCR-DGGE primer sets for the monitoring of lactic acid bacteria in wine. S. Afr. J. Enol. Vitic. [online]. 2014, vol.35, n.2, pp.185-195. ISSN 2224-7904.

Lactic acid bacteria (LAB) play a dual role in winemaking as they are the main effectors of malolactic fermentation, but some members can also cause wine spoilage. PCR-DGGE has proved to be a quick tool to study the LAB community and their fluctuation in wine. For detecting wine-associated LAB by PCR-DGGE, the primer sets WLAB1/WLAB2^GC, WBAC1/WBAC2^GC, Lac1/Lac1o/Lac2^GC, 341f^gC/518r and rpoBl/ rpoB1o/rpoB2^GCwere tested and evaluated in this study. The primer systems were assessed by the separation of LAB reference strains on DGGE gels and by attributing the resulting amplicons to defined species. Subsequently, the detection of LAB in wine samples and enrichments thereof was compared. While the primer systems WBAC1/WBAC2^GCand 341f^GC/518r were not appropriate, the Lac1/Lac1o/Lac2^GCprimer set performed well. However, multiple bands complicated the evaluation. The rpoB1/rpoB1o/rpoB2^GCset seemed to be promising for the detection of LAB in wine, although further improvements in terms of the detection limit need to be done. Due to the pronounced sensitivity and the sufficient discrimination of LAB at species level, the WLAB1/WLAB2^GCprimer system was found to be most suitable for studying the occurrence of LAB in wine.

Keywords : Malolactic fermentation; lactic acid bacteria; wine; PCR-DGGE; primer-set.

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