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Bacterial Diversity in Selenium Reduction of Agricultural Drainage Water Amended with Rice Straw

^a Department of Environmental Sciences, University of California, Riverside, CA 92521
^b Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, Pakistan

View larger version (26K): [in a new window]   Fig. 1. Changes in the concentration of Se species in nonsterilized and sterilized drainage water amended with rice straw during 8 d of incubation.

View larger version (26K): [in a new window]   Fig. 2. Changes in the redox potential (Eh) in nonsterilized and sterilized drainage water amended with rice straw during 8 d of incubation.

View larger version (22K): [in a new window]   Fig. 3. Phylogenetic relationship among the Se-reducing bacterial strains identified by 16S rDNA sequence. Bootstrap values greater than 50 are indicated at each node. The tree is rooted with Thermotoga maritima as the outgroup.

View larger version (96K): [in a new window]   Fig. 4. 16S rDNA–based denaturing gradient gel electrophoresis (DGGE) profiles from the bacterial community in the sterilized and the nonsterilized drainage water amended with rice straw. The terms S and NS denote sterilized and nonsterilized drainage water amended with rice straw, respectively, while M1 and M2 denote markers.

View larger version (76K): [in a new window]   Fig. 5. 16S rDNA–based denaturing gradient gel electrophoresis (DGGE) profiles with cluster analysis of the bacterial community in the sterilized and the nonsterilized drainage water amended with rice straw. The terms S and NS denote sterilized and nonsterilized drainage water amended with rice straw, respectively, while M1 and M2 denote markers.