Abstract
The genus Vibrio, which included 20 species in 1981, increased up to 63 in 2004 and in the last 10 years, 15 new species including Vibrio gigantis have been added. In this study, 20 bioluminescent bacteria were isolated and identified. The identification of the species whose various physiological and biochemical characteristics were identified was based on 16S rRNA gene region and it was determined that it belongs to the V. gigantis species. It was concluded that from the range of temperature and sodium chloride (NaCl) concentration needed, the phenotypic characteristics of the species of this genus used to distinguish them might vary. It was determined that their reproductive ability varied significantly especially in the media containing 0.5 and 9% of NaCl and at incubation temperatures of 4 and 30°C. These differences appeared in various enzymatic activities too. As a result of pulsed-field gel electrophoresis (PFGE) analysis, it was concluded that the genomes of the bioluminescence V. gigantis strains were not completely identical, and had genome homology ranging from 70 to 94% of restriction fragment patterns homology. Therefore, this study is the first one indicating that V. gigantis strains have a bioluminescence feature and high rate of genomic polymorphism. Key words: Vibrio gigantis, bioluminescent bacteria, 16S rRNA, pulsed-field gel electrophoresis (PFGE).
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