Journal of Microbiology

Volume 50(3); June 2012

Research Support, Non-U.S. Gov'ts

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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Antioxidant Capacity of Novel Pigments from an Antarctic Bacterium: Daniela N. Correa-Llantén , Maximiliano J. Amenábar , Jenny M. Blamey; J. Microbiol. 2012;50(3):374-379. Published online June 30, 2012; DOI: https://doi.org/10.1007/s12275-012-2029-1

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Abstract PDF: In Antarctica microorganisms are exposed to several conditions that trigger the generation of reactive oxygen species, such as high UV radiation. Under these conditions they must have an important antioxidant defense system in order to prevent oxidative damage. One of these defenses are pigments which are part of the non-enzymatic antioxidant mechanisms. In this work we focused on the antioxidant capacity of pigments from an Antarctic microorganism belonging to Pedobacter genus. This microorganism produces different types of pigments which belong to the carotenoids group. The antioxidant capacity of a mix of pigments was analyzed by three different methods: 1,1-diphenyl-2-picrylhydrazyl, ROS detection and oxygen electrode. The results obtained from these approaches indicate that the mix of pigments has a strong antioxidant capacity. The oxidative damage induced by UVB exposure to liposomes was also analyzed. Intercalated pigments within the liposomes improved its resistance to lipid peroxidation. Based on the analysis carried out along this research we conclude that the antioxidant properties of the mix of pigments protect this bacterium against oxidative damage. These properties make this mix of pigments a powerful antioxidant mixture with potential biotechnological applications.

Biological Control and Plant Growth Promoting Capacity of Rhizobacteria on Pepper under Greenhouse and Field Conditions: Mi-Seon Hahm , Marilyn Sumayo , Ye-Ji Hwang , Seon-Ae Jeon , Sung-Jin Park , Jai Youl Lee , Joon-Hyung Ahn , Byung-Soo Kim , Choong-Min Ryu , Sa-Youl Ghim; J. Microbiol. 2012;50(3):380-385. Published online June 30, 2012; DOI: https://doi.org/10.1007/s12275-012-1477-y

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