<![CDATA[Endophytic bacteria are beneficial microorganisms that interact with the host plant without causing damage. This study aimed to determine the antimicrobial activity of endophytic bacteria from the roots of Avicennia marina (Forssk.) against Escherichia coli. Samples were collected using a purposive sampling approach with 9 repetitions. Endophytic bacteria were isolated from root tissues and identified using Gram staining and biochemical tests (Simmons citrate, SIM, TSIA, methyl red, catalase, BAP, and MCA). The antimicrobial activity test used the disc diffusion method with a 100% concentration of endophytic bacterial suspension adjusted to 0,5 McFarland standard; ampicillin served as the positive control. Three bacterial isolates were obtained: Aeromonas sp., Enterobacter sp., and Bacillus sp. The average inhibition zones were 18,78 mm (Aeromonas sp.), 15,1 mm (Enterobacter sp.), and 16,66 mm (Bacillus sp.). Based on the standard for interpreting inhibition zones (≥20 mm = very strong; 10–20 mm = strong), all isolates demonstrated strong antibacterial potential. One-way ANOVA revealed a significant difference among the three isolates (p < 0,001), with Aeromonas sp. showing the highest activity. This study is novel in providing the first comparative evidence that Aeromonas sp. from Avicennia marina (Forssk.) roots exhibits superior antibacterial activity against Escherichia coli growth.]]>
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