Biotechnological potential of Ulva ohnoi epiphytic bacteria: enzyme production and antimicrobial activities

Seaweed surfaces harbor diverse epibiotic bacterial communities with functions related to morphogenesis, host health, and defense. Among seaweed holobionts, culturable strains can represent innovative sources of bioactive compounds enzymes. The global industrial demand for microbial enzymes is continually growing in order improve certain manufacturing processes new perspectives exploitation. In this regard, the present study focuses on enzymatic production antimicrobial activities bacteria Ulva from Tunisian coast. Culturable associated were isolated molecular identification was realized by 16S rRNA gene sequencing. For each strain, eight investigated: amylase, hemolysis, DNase, cellulase, lecithinase, lipase, gelatinase, chitinase. activity -associated evaluated against seven pathogenic bacteria, Escherichia coli, Vibrio anguillarum, alginoliticus, Pseudomonas aeruginosa, Aeromonas hydrophila, Salmonella typhymurium , Staphylococcus aureus one yeast, Candida albicans . antibiotic resistance determined 15 commonly used antibiotics. phylogenetic analysis revealed that isolates belonged Alphaproteobacteria (3), Gammaproteobacteria (5), Actinobacteria Firmicutes (4) phyllum. majority (66%) produced simultaneously more than enzyme. Hemolysis 46.6% isolates, while DNase 33% strains. On other hand, 13% lipase. No chitinase bacteria. addition, 60% displayed at least strain. All ohnoi resistant These results highlighted occurrence several within have potential uses sector.