Abstract
A polymerase chain reaction (PCR)-restriction fragment length polymorphism (RFLP) method was developed to detect and identify typical Leuconostoc species. This method utilises a set of specific primers for amplification of the 16S rDNA region of typical Leuconostoc species. All Leuconostoc-type strains, all Leuconostoc isolates from kimchi, Korea's traditional, fermented vegetable product, and strains from closely related genera were examined to verify the identification by this method. The primers resulted in amplification only for nine typical Leuconostoc spp., but not for any other genera tested. The size of the amplified products was 976 bp and the amplicons of the different species could be differentiated from each other with MseI, HaeIII and Tsp509I endonucleases, except for the species Leuconostoc argentinum and Leuconostoc lactis, which were indistinguishable. A PCR-RFLP method for the typical Leuconostoc species was optimized to identify a large number of isolates from fermented vegetable product. This PCR-RFLP method enables the rapid and reliable identification of Leuconostoc species and to distinguish them from the other phylogenetically related lactic acid bacteria in food samples.
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