Which bacterial strain, developed from natural isolated by genetic manipulations, can be used for treating oil spills?

The best choice is Pseudomonas. Genetically altered Pseudomonas putida strains have been reported as successful recipients of plasmid transfer to enhance hydrocarbon degradation for oil-spill remediation [2]. Multiple reviews and studies identify Pseudomonas species as potent degraders of petroleum hydrocarbons (alkanes, aromatics, PAHs) and suitable candidates for bioremediation and engineered approaches [3]. As an example of microbe-based remediation, TERI developed a bacterial mixture called “oilzapper” to degrade oil pollutants, illustrating the practical application of bacterial bioremediation strategies [1]. Taken together, the literature supports Pseudomonas as the strain developed (from natural isolates via genetic manipulation) for treating oil spills.

Sources

1. [2] https://www.researchgate.net/publication/324112035_Genetically_Modified_Microbes_for_Bio-remediation_of_Oil_Spills_in_Marine_Environment
2. [3] https://pmc.ncbi.nlm.nih.gov/articles/PMC7189961/
3. [1] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 5: Environmental Pollution > bi Ex situ bioremediation techniques > p. 100