Journal of Microbiology

Hyoungseok Lee

3 Articles

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
Humic substance turnover by bacterial decomposers in the maritime Antarctic soil
Dockyu Kim, Mincheol Kim, Sungho Woo, Eungbin Kim, Hyoungseok Lee, Monika Gorzelak
Soil Research.2025;[Epub] 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

Soil water content as a critical factor for stable bacterial community structure and degradative activity in maritime Antarctic soil: Dockyu Kim , Namyi Chae , Mincheol Kim , Sungjin Nam , Eungbin Kim , Hyoungseok Lee; J. Microbiol. 2020;58(12):1010-1017. Published online December 2, 2020; DOI: https://doi.org/10.1007/s12275-020-0490-9

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Abstract PDF

Recent increases in air temperature across the Antarctic Peninsula may prolong the thawing period and directly affect the soil temperature (Ts) and volumetric soil water content (SWC) in maritime tundra. Under an 8°C soil warming scenario, two customized microcosm systems with maritime Antarctic soils were incubated to investigate the differential influence of SWC on the bacterial community and degradation activity of humic substances (HS), the largest constituent of soil organic carbon and a key component of the terrestrial ecosystem. When the microcosm soil (KS1-4Feb) was incubated for 90 days (T = 90) at a constant SWC of ~32%, the initial HS content (167.0 mg/g of dried soil) decreased to 156.0 mg (approximately 6.6% loss, p < 0.05). However, when another microcosm soil (KS1-4Apr) was incubated with SWCs that gradually decreased from 37% to 9% for T = 90, HS degradation was undetected. The low HS degradative activity persisted, even after the SWC was restored to 30% with water supply for an additional T = 30. Overall bacterial community structure remained relatively stable at a constant SWC setting (KS1-4Feb). In contrast, we saw marked shifts in the bacterial community structure with the changing SWC regimen (KS1-4Apr), suggesting that the soil bacterial communities are vulnerable to drying and re-wetting conditions. These microcosm experiments provide new information regarding the effects of constant SWC and higher Ts on bacterial communities for HS degradation in maritime Antarctic tundra soil.

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Bacterial community composition and function in different habitats in Antarctic Fildes region revealed by high-throughput sequencing
Yi-He Zhang, Yong-Qiang Hu, Yin-Xin Zeng, Ting Hu, Wei Han, Yu Du, Zhong Hu, Shan-Shan Meng
Frontiers in Microbiology.2025;[Epub] CrossRef
Effect of coal mining subsidence on soil microbial communities in mining areas with high groundwater levels
Ruiping Xu, Junying Li, Xinju Li, Wen Song
Environmental Geochemistry and Health.2025;[Epub] CrossRef
Influence of Composite Amendments on the Characteristics of Sandy Soil
Xinrui Sui, Lingyan Wang, Xinyao Lv, Yanan Liu, Yuqi Zhu, Lingyun Fan, Hanxi Wang
Sustainability.2025; 17(17): 7619. CrossRef
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
Journal of Microbiology.2022; 60(12): 1130. CrossRef
Temperature sensitivity of Antarctic soil‐humic substance degradation by cold‐adapted bacteria
Dockyu Kim, Ha Ju Park, Mincheol Kim, Seulah Lee, Soon Gyu Hong, Eungbin Kim, Hyoungseok Lee
Environmental Microbiology.2022; 24(1): 265. CrossRef
Seasonal patterns of rhizosphere microorganisms suggest carbohydrate-degrading and nitrogen-fixing microbes contribute to the attribute of full-year shooting in woody bamboo Cephalostachyum pingbianense
Lushuang Li, Tize Xia, Hanqi Yang
Frontiers in Microbiology.2022;[Epub] CrossRef

Analysis of Expressed Sequence Tags from the Red Alga Griffithsia okiensis: Hyoungseok Lee , Hong Kum Lee , Gynheung An , Yoo Kyung Lee; J. Microbiol. 2007;45(6):541-546.; DOI: https://doi.org/2611 [pii]

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Abstract PDF: Red algae are distributed globally, and the group contains several commercially important species. Griffithsia okiensis is one of the most extensively studied red algal species. In this study, we conducted expressed sequence tag (ESTs) analysis and synonymous codon usage analysis using cultured G. okiensis samples. A total of 1,104 cDNA clones were sequenced using a cDNA library made from samples collected from Dolsan Island, on the southern coast of Korea. The clustering analysis of these sequences allowed for the identification of 1,048 unigene clusters consisting of 36 consensus and 1,012 singleton sequences. BLASTX searches generated 532 significant hits (E-value <10-4) and via further Gene Ontology analysis, we constructed a functional classification of 434 unigenes. Our codon usage analysis showed that unigene clusters with more than three ESTs had higher GC contents (76.5%) at the third position of the codons than the singletons. Also, the majority of the optimal codons of G. okiensis and Chondrus crispus belonging to Bangiophycidae were C-ending, whereas those of Porphyra yezoensis belonging to Florideophycidae were G-ending. An orthologous gene search for the P. yezoensis EST database resulted in the identification of 39 unigenes commonly expressed in two rhodophytes, which have putative functions for structural proteins, protein degradation, signal transduction, stress response, and physiological processes. Although experiments have been conducted on a limited scale, this study provides a material basis for the development of microarrays useful for gene expression studies, as well as useful information for the comparative genomic analysis of red algae.

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