Bacteria homologus to Aeromonas capable of microcystin degradation
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Data
2014-08-20Autor
Mankiewicz-Boczek, Joanna
Gągała, I.
Jurczak, Tomasz
Jaskulska, A.
Pawełczyk, J.
Dziadek, J.
Metadata
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Water blooms dominated by cyanobacteria
are capable of producing hepatotoxins known as
microcystins. These toxins are dangerous to people and
to the environment. Therefore, for a better understanding
of the biological termination of this increasingly
common phenomenon, bacteria with the potential to
degrade cyanobacteria-derived hepatotoxins and the
degradative activity of culturable bacteria were studied.
Based on the presence of the mlrA gene, bacteria with a
homology to the Sphingopyxis and Stenotrophomonas
genera were identified as those presenting potential for
microcystins degradation directly in the water samples
from the Sulejów Reservoir (SU, Central Poland). However,
this biodegrading potential has not been confirmed in in
vitro experiments. The degrading activity of the culturable
isolates from the water studied was determined in more
than 30 bacterial mixes. An analysis of the biodegradation
of the microcystin-LR (MC-LR) together with an analysis of
the phylogenetic affiliation of bacteria demonstrated for
the first time that bacteria homologous to the Aeromonas
genus were able to degrade the mentioned hepatotoxin,
although the mlrA gene was not amplified. The maximal
removal efficiency of MC-LR was 48%. This study
demonstrates a new aspect of interactions between the
microcystin-containing cyanobacteria and bacteria from
the Aeromonas genus.
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