Journal of Microbiology

Research Article

Dissimilatory nitrate reductions in soil Neobacillus and Bacillus strains under aerobic condition: Seohyun Ahn, Min Cho, Michael J. Sadowsky, Jeonghwan Jang; J. Microbiol. 2025;63(2):e2411019. Published online February 27, 2025; DOI: https://doi.org/10.71150/jm.2411019

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Abstract PDF Supplementary Material: Denitrification and dissimilatory nitrate reduction to ammonium (DNRA) were thought to be carried-out by anaerobic bacteria constrained to anoxic conditions as they use nitrate (NO₃^-) as a terminal electron acceptor instead of molecular O₂. Three soil bacilli, Neobacillus spp. strains PS2-9 and PS3-12 and Bacillus salipaludis PS3-36, were isolated from rice paddy field soil in Korea. The bacterial strains were selected as possible candidates performing aerobic denitrification and DNRA as they were observed to reduce NO₃^- and produce extracellular NH₄⁺ regardless of oxygen presence at the initial screening. Whole genome sequencing revealed that these strains possessed all the denitrification and DNRA functional genes in their genomes, including the nirK, nosZ, nirB, and nrfA genes, which were simultaneously cotranscribed under aerobic condition. The ratio between the assimilatory and dissimilatory NO₃^- reduction pathways depended on the availability of a nitrogen source for cell growth, other than NO₃^-. Based on the phenotypic and transcriptional analyses of the NO₃^- reductions, all three of the facultative anaerobic strains reduced NO₃^- likely in both assimilatory and dissimilatory pathways under both aerobic and anoxic conditions. To our knowledge, this is the first report that describes coexistence of NO₃^- assimilation, denitrification, and DNRA in a Bacillus or Neobacillus strain under aerobic condition. These strains may play a pivotal role in the soil nitrogen cycle.

Research Support, Non-U.S. Gov't

Seasonal Changes in Nitrogen-Cycle Gene Abundances and in Bacterial Communities in Acidic Forest Soils: Jaejoon Jung , Jinki Yeom , Jiwon Han , Jisun Kim , Woojun Park; J. Microbiol. 2012;50(3):365-373. Published online June 30, 2012; DOI: https://doi.org/10.1007/s12275-012-1465-2

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The abundance of genes related to the nitrogen biogeochemical cycle and the microbial community in forest soils (bacteria, archaea, fungi) were quantitatively analyzed via real-time PCR using 11 sets of specific primers amplifying nifH, bacterial amoA, archaeal amoA, narG, nirS, nirK, norB, nosZ, bacterial 16S rRNA gene, archaeal 16S rRNA gene, and the ITS sequence of fungi. Soils were sampled from Bukhan Mountain from September of 2010 to July of 2011 (7 times). Bacteria were the predominant microbial community in all samples. However, the abundance of archaeal amoA was greater than bacterial amoA throughout the year. The abundances of nifH, nirS, nirK, and norB genes changed in a similar pattern, while narG and nosZ appeared in sensitive to the environmental changes. Clone libraries of bacterial 16S rRNA genes were constructed from summer and winter soil samples and these revealed that Acidobacteria was the most predominant phylum in acidic forest soil environments in both samples. Although a specific correlation of environmental factor and gene abundance was not verified by principle component analysis, our data suggested that the combination of biological, physical, and chemical characteristics of forest soils created distinct conditions favoring the nitrogen biogeochemical cycle and that bacterial communities in undisturbed acidic forest soils were quite stable during seasonal change.

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