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  • Title: Devosia oryzisoli sp. nov., a novel moderately halotolerant bacterium isolated from the roots of rice plants and genome mining revealed the biosynthesis potential as plant growth promoter.
    Author: Chhetri G, Kim I, Seo T.
    Journal: Antonie Van Leeuwenhoek; 2023 Mar; 116(3):231-242. PubMed ID: 36525157.
    Abstract:
    A Gram-stain-negative, halotolerant bacterium designated as PTR5T was isolated from the roots of rice plants, collected in Ilsan, South Korea. Cells were, aerobic, asporogenous, motile, rod-shaped, white in color, and grew at 5-38 °C (optimum 30 °C), at pH 5.0-0-8.0 (optimum, 7.0) and tolerates up to 10% (w/v) NaCl (optimum, 0% NaCl). According to the EZbioCloud server the most closely related Devosia species to strain PTR5T based on 16 S rRNA gene sequence comparison are Devosia crocina (97.4%), followed by D. soli (97.2%), D. lucknowensis (96.9%) and D. marina (96.5%). The respiratory quinone was identified as Q-10. The major polar lipids were phosphatidylglycerol and diphosphatidylglycerol. C16:0, C18:1 ω7c 11-methyl and summed feature 8 (comprising C18:1 ω7c/C18:1 ω6c) constituted the main cellular fatty acids. The draft genome sequence of strain PTR5T was 3,689,283 bp in size. The average nucleotide identity (ANI), digital DNA-DNA hybridization (dDDH) and amino acid identity (AAI) values between strain PTR5T and its close relative were 72.8-76.8%, 19-20.7% and 70.3-75%, respectively. The G + C content was 63.7%. Strain PTR5T was able to produce siderophore and indole acetic acid (IAA) in the presence of L-tryptophan. Genes for siderophore production, auxin responsive and tryptophan biosynthesis were present in the genome of novel strain. Also, gene clusters involved in detoxification of various metal pollutants and antibiotics were also revealed in the genome of novel strain PTR5T, this suggest that novel strain can facilitate bioremediation of heavy metals and antibiotics in contaminated areas. This study aimed to determine the detailed taxonomic position of the strain PTR5T using the modern polyphasic approach. On the basis of evidence presented in this study, strain PTR5T is considered to represent a novel species of the genus Devosia, for which the name Devosia oryzisoli sp. nov. (type strain PTR5T (KCTC 82691T = TBRC 15163T) is proposed.
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