Functional diversity of bacteria in various saline soil plant vegetations around Sialang Buah Coast, North Sumatra, Indonesia

Mariani Sembiring, Juli M. Hutahuruk, Dwi Ningsih Susilowati, Erny Yuniarti, T. Sabrina, Luthfi A. Mahmud Siregar

Abstract

Environmental conditions profoundly influence microbial diversity and activity in soil. For optimal growth, soil microbes face limiting factors such as temperature, moisture, pH, and salinity levels in a given environment. This research aims to identify microorganisms capable of thriving in high-salinity (saline) soil conditions. The study was conducted in the Soil Biology Laboratory at Universitas Sumatera Utara (USU), Indonesia. Soil samples were collected around the Sialang Buah Coast, Serdang Bedagai Regency, North Sumatra, Indonesia. The method employed in this research was random composite sampling taken from three vegetation types: mangrove forests, grasslands, and oil palm plantations, with sample collection locations influenced by tidal fluctuations. Ten sampling points were taken at each location and then composited for each vegetation type. The research findings revealed that there are ten species of bacteria originating from saline soils, and all of them are able to grow on Pikovskaya, Alexandrov, and Jansen media. Among the ten bacteria found, seven species were capable of forming biofilms, namely Pseudomonas aeruginosa, Burkholderia gladioli, Enterobacter cloacae, Brucella ciceri, Achromobacter xylosoxidans, Priestia flexa and Enterobacter quasiroggenkampii.

Keywords

Biofilm; Microbial diversity; Nutrient availability; Salinity; Vegetation types

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References

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DOI: https://doi.org/10.20961/stjssa.v21i2.80075

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