Bacterial dissimilatory MnO(2) reduction at extremely haloalkaline conditions.

ABSTRACT: A possibility of dissimilatory MnO(2) reduction at extremely high salt and pH was studied in sediments from hypersaline alkaline lakes in Kulunda Steppe (Altai, Russia). Experiments with anaerobic sediment slurries demonstrated a relatively rapid reduction of colloidal MnO(2) in the presence of acetate and formate as electron donor at in situ conditions (i.e., pH 10 and a salt content from 0.6 to 4 M total Na(+)). All reduced Mn at these conditions remained in the solid phase. A single, stable enrichment culture was obtained from the slurries consistently reducing MnO(2) at pH 10 and 0.6 M total Na(+) with formate. A pure culture of a haloalkaliphilic Mn-reducing bacterium obtained from the positive enrichment was phylogenetically closely related to the anaerobic haloalkaliphilic Bacillus

SUBMITTER: Sorokin DY 

PROVIDER: S-EPMC2797408 | biostudies-literature | 2010 Jan

REPOSITORIES: biostudies-literature