Antimicrobial Activities of Bacteria Associated with the Brown Alga Padina pavonica

作者：Ismail Amel; Ktari Leila; Ahmed Mehboob; Bolhuis Henk; Boudabbous Abdellatif; Stal Lucas J; Cretoiu Mariana Silvia; El Bour Monia^*

来源：Frontiers in Microbiology, 2016, 7: 1072.

DOI：10.3389/fmicb.2016.01072

• Padina pavonica
• Bacillus pumilus
• antibiotics
• epibionts
• seaweed

Macroalgae belonging to the genus Padina are known to produce antibacterial compounds that may inhibit growth of human- and animal pathogens. Hitherto, it was unclear whether this antibacterial activity is produced by the macroalga itself or by secondary metabolite producing epiphytic bacteria. Here we report antibacterial activities of epiphytic bacteria isolated from Padina pavonica (Peacocks tail) located on northern coast of Tunisia. Eighteen isolates were obtained in pure culture and tested for antimicrobial activities. Based on the 16S rRNA gene sequences the isolates were closely related to Proteobacteria (12 isolates: 2 Alpha- and 10 Gammaproteobacteria), Firmicutes (4 isolates) and Actinobacteria (2 isolates). The antimicrobial activity was assessed as inhibition of growth of 12 species of pathogenic bacteria (Aeromonas salmonicida, A. hydrophila, Enterobacter xiangfangensis, Enterococcus faeciurn, Escherichia coli. Micrococcus sp., Salmonella typhimurium, Staphylococcus aureus, Streptococcus sp., Vibrio alginoliticus, V proteolyticus, V vulnificus) and one pathogenic yeast (Candida albicans). Among the Firrnicutes, isolate P8, which is closely related to Bacillus pumilus, displayed the largest spectrum of growth inhibition of the pathogenic bacteria tested. The results emphasize the potential use of P. pavonica associated antagonistic bacteria as producers of novel antibacterial compounds.

• 出版日期2016-7-12