Abstract
We compared the ability of two bacterial strains, Paenibacillus polymyxa A26 and P. polymyxa A26Sfp, for biodegradation of naphthalene (NAP). The studies were performed under simulated laboratory conditions, in liquid medium and soil with different carbon sources, pH and salt contents. Changes in the luminescence inhibition of Aliivibrio fischeri, as an indicator of the baseline toxicity, were observed in degradation mixtures during 7 days of incubation. While both strains expressed the best growth and NAP degradation ability in the minimal salt medium containing sucrose and 5% NaCl at pH 7 and 8, the mutant strain remained effective even under extreme conditions. A26Sfp was found to be an efficient and potentially industrially important polycyclic aromatic hydrocarbon degradation strain. Its extracellular polysaccharide production is 30%, and glucan production is twice that of the wild type A 26. The surface tension reduction ability was ascertained as 25–30% increased emulsification ability.
Highlights
Crude oils contain many major and minor constituents
P. polymyxa strains from the harsh South Facing Slope (SFS) in comparison to the moderate North Facing Slope (NFS) at ‘Evolution Canyon’ (EC), Israel, show huge differences in their metabolism, drought tolerance enhancement and biocontrol ability [25]
Non-ribosomal peptides produced by non-ribosomal peptide synthetases (NRPS), and polyketides are produced by polyketide synthetases (PKS)
Summary
Crude oils contain many major and minor constituents. The properties of the constituents influence how the spilled oil behaves and determines the fate and effects of the spill in the environment [1]. The mutant, compared to its wild type A26, is 30% enhanced in its biofilm exopolysaccharide (EPS) production [13,14,15] This correlates with the improved drought stress tolerance conferred by the strain and the enhanced biocontrol ability [12,13,14,15,16]. Non-ribosomal peptides produced by non-ribosomal peptide synthetases (NRPS), and polyketides are produced by polyketide synthetases (PKS) Both are diverse families of natural products with an extremely broad range of biological activities [12,26] These molecules exhibit a broad range of structural diversity and display biological activities that include adaptation to unfavourable environments, and communication or competition with other microorganisms in their natural habitat [12,26]
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