| Title |
Molecular Analysis of Spatial Variation of Iron-Reducing Bacteria in Riverine Alluvial Aquifers of the Mankyeong River |
| Author |
So-Jeong Kim1, Dong-Chan Koh2, Soo-Je Park1, In-Tae Cha1, Joong-Wook Park3, Jong-Hwa Na4, Yul Roh5, Kyung-Seok Ko2, Kangjoo Kim6, and Sung-Keun Rhee1* |
| Address |
1Department of Microbiology, Chungbuk National University, Cheongju 361-763, Republic of Korea, 2KoreaInstitute of Geoscience and Mineral Resources, Daejeon 305-350, Republic of Korea, 3Department of Biochemistry and Microbiology, Biotechnology Center for Agriculture and the Environment, Rutgers, The State University of New Jersey, New Brunswick, NJ, 08901, USA, 4Department of Information & Statistics, Chungbuk National University, Cheongju 361-763, Republic of Korea, 5Faculty of Earth Systems and Environmental Sciences, Chonnam National University, Gwangju 500-757, Republic of Korea, 6School of Civil and Environmental Engineering, Kunsan National University, Jeonbuk 573-701, Republic of Korea |
| Bibliography |
Journal of Microbiology, 50(2),207-217, 2012,
|
| DOI |
|
| Key Words |
iron reduction, riverineaquifer, arsenic, Geobacter spp., Rhodoferax ferrireducens |
| Abstract |
Alluvial aquifers are one of the mainwater resources in
many countries. Iron reduction in alluvial aquifers is often
a major anaerobic process involved in bioremediation or
causing problems, including the release of As trapped in
Fe(III) oxide. We investigated the distribution of potential
iron-reducing bacteria (IRB) in riverine alluvial aquifers
(B1, B3, and B6 sites) at the Mankyeong River, Republic of
Korea. Inactive iron reduction zones, the diversity and abundance
of IRB can be examined using a clone library and
quantitative PCR analysis of 16S rRNA genes. Geobacter
spp. are potential IRB in the iron-reducing zone at the B6
(9 m) site, where high Fe(II) and arsenic (As) concentrations
were observed. At the B3 (16 m) site, where low iron reduction
activity was predicted, a dominant clone (10.6%) was
99% identical in 16S rRNA gene sequence with Rhodoferax
ferrireducens. Although a major clone belonging to Clostridium
spp. was found, possible IRB candidates could not be
unambiguously determined at the B1 (18 m) site. Acanonical
correspondence analysis demonstrated that, among potential
IRB, only the Geobacteraceae were well correlated with Fe(II)
and As concentrations. Our results indicate high environmental
heterogeneity, and thus high spatial variability, in
thedistribution of potential IRB in the riverine alluvial
aquifersnear the Mankyeong River. |
