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292 results on '"Hong, Soon Gyu"'

4. Acidisoma cladoniae sp. nov., an acidotolerant bacterium isolated from an Antarctic lichen.

Author

Cho, Un, Jeon, Jehyun, Kim, Woohyun, Hong, Soon Gyu, Lee, Hyoungseok, and Lee, Yung Mi

Abstract

Gram-staining-negative, aerobic, white-cream-pearly colony, coccobacilli, and non-motile bacterial strain, PAMC 29798T was isolated from an Antarctic lichen. The strain was acidotolerant and psychrotolerant growing at pH 4.0–7.5 (optimally at pH 4.0–6.5) and 0–25 °C (optimally at 10–20 °C). The major fatty acids are Summed Feature 8, C18:1 2OH, and C19:0 cyclo ω8c. The major respiratory quinone was Q-10. Phylogenetic and phylogenomic analyses indicated that strain PAMC 29798T belonged to the genus Acidisoma and 16S rRNA gene sequences of PAMC 29798T were closely related to Acidisoma silvae (97.7% sequence similarity), Acidisoma cellulosilyticum (96.5%), Acidisoma tundrae (96.5%), and Acidisoma sibiricum (96.3%). Genomic relatedness analyses showed that strain PAMC 29798T was clearly distinguished from type strains of the genus Acidisoma based on values of average nucleotide identity (< 75%) and the digital DNA-DNA hybridization (< 19.6%). Genome analysis revealed that the genome size of PAMC 29798T is approximately 5.0 Mb with a G+C content of 63.4%. The complete genome comprises 5 contigs containing 4636 protein-coding genes, 46 tRNA genes, and 2 rRNA operons. The genome possesses genes for light-harvesting complexes, type-II photosynthetic reaction center, and C-P lyase to solubilize organic phosphates, while genes encoding nitrogenase iron protein involved in the nitrogen fixation were not present. Based on the results of phylogenetic, genome-based relatedness, and physiological and genomic analyses, strain PAMC 29798T is proposed to represent a novel species of the genus Acidisoma, with the name Acidisoma cladoniae. The type strain is PAMC 29798T (= KCTC 82159T = JCM 35634T). [ABSTRACT FROM AUTHOR]

Published
2024
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10. Life under the snow: A year‐round transcriptome analysis of Antarctic mosses in natural habitats provides insight into the molecular adaptation of plants under extreme environment

Author

Yu, Jihyeon, primary, Lee, Hyoungseok, additional, Cho, Sung Mi, additional, Lee, Yelim, additional, Kim, Dockyu, additional, Hong, Soon Gyu, additional, Park, Sang‐Jong, additional, Kim, Sang‐Gyu, additional, Jin, Hongshi, additional, and Lee, Jungeun, additional

Published
2024
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47. Temperature sensitivity of Antarctic soil‐humic substance degradation by cold‐adapted bacteria.

Author

Kim, Dockyu, Park, Ha Ju, Kim, Mincheol, Lee, Seulah, Hong, Soon Gyu, Kim, Eungbin, and Lee, Hyoungseok

Subjects
TUNDRAS, SOIL temperature, HUMUS, MICROBIAL growth, BACTERIAL communities, ENVIRONMENTAL soil science
Abstract

Summary: Heteropolymer humic substances (HS) are the largest constituents of soil organic matter and are key components that affect plant and microbial growth in maritime Antarctic tundra. We investigated HS decomposition in Antarctic tundra soils from distinct sites by incubating samples at 5°C or 8°C (within a natural soil thawing temperature range of −3.8°C to 9.6°C) for 90 days (average Antarctic summer period). This continuous 3‐month artificial incubation maintained a higher total soil temperature than that in natural conditions. The long‐term warming effects rapidly decreased HS content during the initial incubation, with no significant difference between 5°C and 8°C. In the presence of Antarctic tundra soil heterogeneity, the relative abundance of Proteobacteria (one of the major bacterial phyla in cold soil environments) increased during HS decomposition, which was more significant at 8°C than at 5°C. Contrasting this, the relative abundance of Actinobacteria (another major group) did not exhibit any significant variation. This microcosm study indicates that higher temperatures or prolonged thawing periods affect the relative abundance of cold‐adapted bacterial communities, thereby promoting the rate of microbial HS decomposition. The resulting increase in HS‐derived small metabolites will possibly accelerate warming‐induced changes in the Antarctic tundra ecosystem. [ABSTRACT FROM AUTHOR]

Published
2022
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