Abstract
Sulaibikhat Embayment is a severely contaminated coastline in the State of Kuwait. The contaminating pollutants include hydrocarbons, heavy metals, and suspended particles. The objective of this study is to assess the ability of mangroves planted in the Sulaibikhat Embayment to enhance hydrocarbons degradation by the activities of rhizospheric hydrocarbon degrading bacteria (HDB). Accordingly, samples were collected from the rhizosphere of selected mangrove plants and from sediments in the same location but away from mangrove marshes. The samples were analyzed chemically and microbiologically before being enriched with a mixture of hydrocarbon compounds (HC) to isolate HDB. A number of halophilic HDB were isolated from mangroves rhizosphere and the surrounding sediments such as Pseudomonas balearica, Microbacterium barkeri and Gordonia soli. On the other hand, Bacillus velezensis and Bacillus subtilis subtilis were both isolated only from mangroves rhizosphere. Among the isolated HDB, Bacillus subtilis subtilis was distinguished with its high degradation rates of the tested HC including poly aromatic hydrocarbons. According to our knowledge, this is the first Bacillus subtilis HC-degrading strain that was isolated from Kuwait Bay and from mangroves rhizosphere.
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