Antibacterial activity of Achromobacter sp. and Bacillus sp., bacterial endophytes derived from Mangrove Ceriops tagal (Perr.) C.B.Robb

A total of 95 bacterial endophytes have been isolated from mangroves plant in Bengkalis coastal area, Riau Province, Indonesia. Mangrove plant samples were identified as Bruguiera sp. and Ceriops tagal (Perr.) C.B.Robb. Antagonism study showed that 4 out of 95 isolates were possessed antibacterial activity based on their ability to inhibit the growth of Vibrio alginolyticus and Staphylococcus aureus; while none of them was able to inhibit Escherichia coli. According to the results of 16s rRNA genes amplification, the closest species relative of the 4 active isolates was Achromobacter insolitus (isolate no. 34), Bacillus siamensis (isolate no. 39), and Bacillus subtilis (isolate no. 88 and 89). This is the first report on bacterial endophytes associated with Mangrove in Riau Province, Indonesia.