Journal of Microbiology

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Microbial metabolic responses and CO2 emissions differentiated by soil water content variation in subarctic tundra soils: Dockyu Kim , Namyi Chae , Mincheol Kim , Sungjin Nam , Tai Kyoung Kim , Ki-Tea Park , Bang Yong Lee , Eungbin Kim , Hyoungseok Lee; J. Microbiol. 2022;60(12):1130-1138. Published online November 24, 2022; DOI: https://doi.org/10.1007/s12275-022-2378-3

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Recent rapid air temperature increases across the northernlatitude tundra have prolonged permafrost thawing and snow melting periods, resulting in increased soil temperature (Ts) and volumetric soil water content (SWC). Under prolonged soil warming at 8°C, Alaskan tundra soils were incubated in a microcosm system and examined for the SWC differential influence on the microbial decomposition activity of large molecular weight (MW) humic substances (HS). When one microcosm soil (AKC1-1) was incubated at a constant SWC of 41% for 90 days (T = 90) and then SWC was gradually decreased from 41% to 29% for another T = 90, the initial HS was partly depolymerized. In contrast, in AKC1-2 incubated at a gradually decreasing SWC from the initial 32% to 10% for T = 90 and then increasing to 27% for another T = 90, HS depolymerization was undetected. Overall, the microbial communities in AKC1-1 could maintain metabolic activity at sufficient and constant SWC during the initial T = 90 incubation. In contrast, AKC1-2 microbes may have been damaged by drought stress during the drying SWC regimen, possibly resulting in the loss of HS decomposition activity, which did not recover even after re-wetting to an optimal SWC range (20–40%). After T = 90, the CO2 production in both treatments was attributed to the increased decomposition of small-MW organic compounds (including aerobic HS-degradative products) within an optimal SWC range. We expect this study to provide new insights into the early effects of warming- and topography-induced SWC variations on the microbial contribution to CO2 emissions via HS decomposition in northern-latitude tundra soil.

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Unidirectional freeze–thaw redistributes water and amplifies soil microbial heterogeneity in a mecrocosm experiment
Huimin Liu, Yaxian Hu, Yuan Song, Xianwen Li, Xiaorong Wei
Geoderma.2025; 453: 117126. CrossRef
Analysis of CO2 Emission from Urban Soils of the Kola Peninsula (European Arctic)
M. V. Korneykova, V. I. Vasenev, N. V. Saltan, M. V. Slukovskaya, A. S. Soshina, M. S. Zavodskikh, Yu. L. Sotnikova, A. V. Dolgikh
Eurasian Soil Science.2023; 56(11): 1653. CrossRef
Analysis of CO₂ Emission by Urban Soils under the Conditions of the Kola North
M. V. Korneykova, V. I. Vasenev, N. V. Saltan, M. V. Slukovskaya, A. S. Soshina, M. S. Zavodskikh, Y. L. Sotnikova, A. V. Dolgikh
Почвоведение.2023; (11): 1385. CrossRef

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

Roles of RpoS in Yersinia pseudotuberculosis stress survival, motility, biofilm formation and type VI secretion system expression: Jingyuan Guan , Xiao Xiao , Shengjuan Xu , Fen Gao , Jianbo Wang , Tietao Wang , Yunhong Song , Junfeng Pan , Xihui Shen , Yao Wang; J. Microbiol. 2015;53(9):633-642. Published online August 27, 2015; DOI: https://doi.org/10.1007/s12275-015-0099-6

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Abstract

RpoS (σS), the stationary phase/stress σ factor, controls the expression of a large number of genes involved in cellular responses to a variety of stresses. However, the role of RpoS appears to differ in different bacteria. While RpoS is an important regulator of flagellum biosynthesis, it is associated with biofilm development in Edwardsiella tarda. Biofilms are dense communities formed by bacteria and are important for microbe survival under unfavorable conditions. The type VI secretion system (T6SS) discovered recently is reportedly associated with several phenotypes, ranging from biofilm formation to stress sensing. For example, Vibrio anguillarum T6SS was proposed to serve as a sensor for extracytoplasmic signals and modulates RpoS expression and stress response. In this study, we investigated the physiological roles of RpoS in Yersinia pseudotuberculosis, including bacterial survival under stress conditions, flagella formation, biofilm development and T6SS expression. We found that RpoS is important in resistance to multiple stressors–including H2O2, acid, osmotic and heat shock–in Y. pseudotuberculosis. In addition, our study showed that RpoS not only modulates the expression of T6SS but also regulates flagellum formation by positively controlling the flagellar master regulatory gene flhDC, and affects the formation of biofilm on Caenorhabditis elegans by regulating the synthesis of exopolysaccharides. Taken together, these results show that RpoS plays a central role in cell fitness under several adverse conditions in Y. pseudotuberculosis.

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