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We investigated the degradation of hexachlorocyclohexane (HCH) in soil by two cyanobacteria isolates Anabaena variabilis N 21 and Nostoc calcicola N 25 under high concentrations of NaCl. After four months of incubation cultures in saline soils with 4% NaCl decreased HCH concentrations considerably from 2 µg/g soil to 14 ng/g soil, representing 1% of the introduced HCH. In pure cultures 1 M NaCl was not lethal but significantly changed the morphology of the cyanobacteria. Enzyme assays for aldehyde oxidase and xanthine oxidase indicated the overexpression of xanthine oxidase in Nostoc calcicola N25 under salt-stress. Our results indicate that the strains can be used as biopreparations for bioremediation of salt-affected soils polluted with persistent chlororganic compounds often found in Uzbekistan soils

environment and natural resources research

Functioning of Salt Tolerant Anabaena variabilis and Nostoc calcicola Strains in Salt Stress, Destructors of Hexachlorocyclohexane (HCH) in Saline Conditions