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Title of Journal: World J Microbiol Biotechnol

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Abbravation: World Journal of Microbiology and Biotechnology

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Springer Netherlands

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1573-0972

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Shifts in alkane-degrading bacteria genotypes during bioremediation of a vegetated coastal soil

Authors: Alexandra K. Shibata, Françoise M. Robert,

Publish Date: 2009/05/18
Volume: 25, Issue:9, Pages: 1667-1675
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Abstract

The effect of plants (milo, oleander and buffelgrass) and hexadecane (1 g/kg of soil) on the diversity of hexadecane-degraders in a coastal soil was investigated. Hexadecane was rapidly degraded during the first 56 days. Its depletion was not plant-enhanced but was slightly retarded by milo and buffelgrass. The diversity of the dominant cultured hexadecane-degrading bacteria was based on sequencing of the V6-8 region of 16S rDNA. On day 0, Alphaproteobacteria prevailed. By day 56, Gammaproteobacteria dominated the contaminated samples whereas similar numbers of Alphaproteobacteria and Gammaproteobacteria genotypes occurred in the uncontaminated samples. Bacteria related to Alcanivorax, a specialized alkane-degrading marine bacterium, were found in all contaminated samples except for buffelgrass rhizospheres, which solely harbored Pseudomonas indica. On day 114, when hexadecane was highly depleted in the contaminated treatments, similar numbers of Alpha- and Gammaproteobacteria genotypes occurred in contaminated and uncontaminated samples. At this stage Alcanivorax had virtually disappeared. Thus in this coastal soil the prevalence of the alkane-dependent Alcanivorax may be a useful indicator of bioremediation progress provided the plant cover favors the dominance of Alcanivorax.


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