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- 저자 : Geeta Chhetri (검색결과 3 건)
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Chhetri Geeta,Kim Inhyup,Kang Minchung,Kim Jiyoun,So Yoonseop,Seo Taegun 한국미생물학회 2022 The journal of microbiology Vol.60 No.1
Two novel Gram-negative, aerobic, asporogenous, motile, rodshaped, orange and white pigmented, designated as LEGU1T and G19T, were isolated from the roots of rice plants, collected from Goyang, South Korea. Phylogenetic analysis based on their 16S rRNA gene sequences revealed that they belonged to the genus Devosia and formed a different lineage and clusters with different members of the genus Devosia. These strains shared common chemotaxonomic features. In particular, they had Q-10 as the sole quinone, phosphatidylglycerol, diphosphatidylglycerol as the principal polar lipids and C16:0, C18:1 ω7c 11-methyl and summed feature 8 (comprising C18:1 ω7c/ C18:1 ω6c) as the main fatty acids. The draft genome sequences of strains LEGU1T and G19T were 3,524,978 and 3,495,520 bp in size, respectively. Their average nucleotide identity (ANI) and digital DNA-DNA hybridization (dDDH) values were 72.8–81.9% and 18.7–25.1%, respectively, with each other and type strains of related species belonging to the genus Devosia, suggesting that these two strains represent novel species. The G + C content of strains LEGU1T and G19T were 62.1 and 63.8%, respectively. Of the two strains, only LEGU1T produced carotenoid and flexirubin-type pigment. Both strains produced siderophore and indole acetic acid (IAA) in the presence of L-tryptophan. Siderophore biosynthesis genes, auxin responsive genes and tryptophan biosynthesis genes were present in their genomes. The present study aimed to determine the detailed taxonomic positions of the strains using the modern polyphasic approach. Based on the results of polyphasic analysis, these strains are suggested to be two novel bacterial species within the genus Devosia. The proposed names are D. rhizoryzae sp. nov., and Devosia oryziradicis sp. nov., respectively. The plant growth promoting effects of these strains suggest that they can be exploited to improve rice crop productivity. The type strain of D. rhizoryzae is LEGU1T (KCTC 82712T = NBRC 114485T) and D. oryziradicis is G19T (KCTC 82688T = NBRC 114842T).
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Jiyoun Kim,Geeta Chhetri,Inhyup Kim,Hyungdong Kim,Myung Kyum Kim,Taegun Seo 한국미생물학회 2019 The journal of microbiology Vol.57 No.11
A Gram-stain-negative, asporogenous, aerobic rods, motile by means of a single polar flagellum, catalase- and oxidase-positive, methylotrophic bacterium, designated 17Sr1-28T, was isolated from gamma ray-irradiated soil. The 16S rRNA gene sequence analysis showed that strain 17Sr1-28T was phylogenetically related to Methylobacterium currus PR1016AT (96.8%), Methylobacterium platani PMB02T (96.2%), Methylobacterium aquaticum DSM 16371T (96.3%), Methylobacterium tarhaniae N4211T (96.4%), Methylobacterium frigidaeris IER25-16T (95.8%), and Methylobacterium organophilum JCM 2833T (92.7%). The G+C content calculated based on genome sequence was 71.6%. The average nucleotide identity and in silico DNA-DNA hybridization values between strain 17Sr1- 28T and M. currus, M. platani, M. aquaticum, M. tarhaniae, M. frigidaeris, and M. organophilum were 77.7–90.4% and 22–39.6%, respectively. The major fatty acids of strain 17Sr1- 28T were summed feature 8 (C18:1 ω7c and/or C18:1 ω6c), and summed feature 3 (C16:1 ω7c and/or C16:1 ω6c). The predominant quinone was ubiquinone 10 and the major polar lipids were diphosphatidylglycerol, phosphatidylcholine, phosphatidylethanolamine, and phosphatidylglycerol. On the basis of the data from phenotypic tests and genotypic differences between strain 17Sr1-28T and its close phylogenetic relatives, strain 17Sr1-28T represents a new species belonging to the genus Methylobacterium, for which the name Methylobacterium terrae sp. nov. (= KCTC 52904T = NBRC 112873T) is proposed.
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Flavobacterium humi sp. nov., a flexirubin-type pigment producing bacterium, isolated from soil
김인협,Jiyoun Kim,Geeta Chhetri,Taegun Seo 한국미생물학회 2019 The journal of microbiology Vol.57 No.12
A yellow pigmented, Gram-stain-negative, strictly aerobic, rod-shaped, motile by means of gliding, catalase and oxidase positive bacterium, designated strain DS2-AT, was isolated from soil. Growth was observed at 4–32°C (optimum, 28°C), pH 6–9 (optimum, 7.0), and with 0–0.25% (w/v) NaCl (optimum, 0%). Phylogenetic analysis of 16S rRNA gene sequence revealed that strain DS2-AT belonged to the genus Flavobacterium and was most closely related to Flavobacterium aquatile LMG 4008T (96.4%), Flavobacterium terrae DSM 18829T (95.6%), Flavobacterium vireti THG-SM1T (95.5%), Flavobacterium inkyongense IMCC27201T (95.4%), Flavobacterium brevivitae TTM-43T (95.2%), and Flavobacterium cucumis DSM 18830T (95.2%). Strain DS2-AT produces flexirubin- type pigments. The major fatty acids were iso-C15:0, iso-C17:0 3-OH, and iso-C15:0 3-OH. The major respiratory quinone was identified as menaquinone-6. The major polar lipid was found to be phosphatidylethanolamine. The average nucleotide identity values between strain DS2-AT and selected taxa, F. aquatile LMG 4008T, F. terrae DSM 18829T, and F. cucumis DSM 18830T, were 72, 72.7, and 71.6%, respectively. The draft genome of strain DS2-AT has a number of 14 contigs, scaffold N50 of 476,310 bp and a total size of 3,563,867 bp. Additionally, strain DS2-AT contains 3,127 of gene, 41 of tRNA, 6 of rRNA, and 3 of ncRNA. The DNA G + C content of stain DS2-AT was 40.7 mol%. Based on phylogenetic and phenotypic analyses, strain DS2-AT is considered as a novel species of the genus Flavobacterium, for which the name Flavobacterium humi sp. nov., (type strain DS2-AT = KACC 19715T = JCM 32786T) has been proposed.
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