Here we evaluated whether the potential of Phragmites australis to phytoremediate Cu contaminated
sediments could be enhanced by bioaugmentation with an autochthonous microorganism consortium
(AMC) that is resistant to Cu.
Saltmarsh plants with sediment attached to their roots were collected, placed in vessels and kept in
greenhouses, under tidal simulation. Sediments were contaminated with Cu and the AMC was added
to half of the vessels.
After two months, plants accumulated significant amounts of Cu (2–10 times more) in all tissues
although in higher amounts (7–10 times more) in belowground structures. AMC addition increased Cu
bioavailability (5–10%) in sediments leading to a decrease in belowground structures biomass. However,
bioaugmentation increased Cu translocation, with higher amounts (2 times more) of Cu in the plant
stems, without significant visual toxicity signs.
Therefore, autochthonous bioaugmentation can increase Cu phytoextraction potential of P. australis,
which can be a valuable strategy for the recovery and management of moderately impacted estuaries.
Here we evaluated whether the potential of Phragmites australis to phytoremediate Cu contaminated
sediments could be enhanced by bioaugmentation with an autochthonous microorganism consortium
(AMC) that is resistant to Cu.
Saltmarsh plants with sediment attached to their roots were collected, placed in vessels and kept in
greenhouses, under tidal simulation. Sediments were contaminated with Cu and the AMC was added
to half of the vessels.
After two months, plants accumulated significant amounts of Cu (2–10 times more) in all tissues
although in higher amounts (7–10 times more) in belowground structures. AMC addition increased Cu
bioavailability (5–10%) in sediments leading to a decrease in belowground structures biomass. However,
bioaugmentation increased Cu translocation, with higher amounts (2 times more) of Cu in the plant
stems, without significant visual toxicity signs.
Therefore, autochthonous bioaugmentation can increase Cu phytoextraction potential of P. australis,
which can be a valuable strategy for the recovery and management of moderately impacted estuaries.
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