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Study highlights the role of epiphytic bacteria in arsenic metabolism in hydrilla verticillata

Arsenic (As) is a class 1 nonthreshold human carcinogen that is ubiquitous in the natural environment. Aquatic submerged macrophytes have attracted considerable attention recently for their phytoremediation potential of As contaminated waters. The water purifying function of the macrophytes is most likely attributed to the role of the composite system (the plant—epiphytic bacteria system), which remains largely unknown.  Previous studies have confirmed that diverse epiphytic bacterial communities are associated with the submerged aquatic macrophytes, whereas very limited information is available on the diversity of As-speciation related bacteria in these habitats. Hence, it is necessary to fully investigate the effect of epiphytic bacterial community on metabolism of inorganic As by submerged aquatic plants. The results will contribute to an overall understanding of As biogeochemistry in aquatic environments.  In this study, sterile or nonsterile H. verticillata was cultured with arsenite (As(III)) or arsenate (As(V)) under laboratory condition to investigate the impact of epiphytic bacteria on As uptake, transformation and efflux by H. verticillata.  Read more....



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