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  • Title: Flavobacterium salilacus sp. nov., isolated from surface water of a hypersaline lake, and descriptions of Flavobacterium salilacus subsp. altitudinum subsp. nov. and Flavobacterium salilacus subsp. salilacus subsp. nov.
    Author: Debnath SC, Chen C, Khan I, Wang WJ, Zheng DQ, Xu JZ, Wang PM.
    Journal: Int J Syst Evol Microbiol; 2020 Jul; 70(7):4250-4260. PubMed ID: 32568031.
    Abstract:
    Two yellow-pigmented, Gram-stain-negative, aerobic, rod-shaped bacteria were isolated from the water of the hypersaline Chaka Salt Lake (strain SaA2.12T) and sediment of Qinghai Lake (strain LaA7.5T), PR China. According to the 16S rRNA phylogeny, the isolates belong to the genus Flavobacterium, showing the highest 16S rRNA sequence similarities to Flavobacterium arcticum SM1502T(97.6-97.7 %) and Flavobacterium suzhouense XIN-1T(96.5-96.6 %). Moreover, strains SaA2.12T and LaA7.5T showed 99.73 % 16S rRNA sequence similarity to each other. Major fatty acids, respiratory quinones and polar lipids detected in these isolates were iso-C15 : 0, menaquinone-6 and phosphatidylethanolamine, respectively. Strains SaA2.12T and LaA7.5T showed significant unique characteristics between them as well as between the closest phylogenetic members. The highest digital DNA-DNA hybridization (dDDH) and average nucleotide identity (ANI) values between SaA2.12T and its closest neighbours were 25.3 and 82.8 %, respectively; whereas these values (highest) between LaA7.5T and its closest members were 25.2 and 82.8 %, respectively. The dDDH and ANI values between strains SaA2.12T and LaA7.5T were calculated as 75.9 and 97.2 %, respectively. Therefore, based on polyphasic data, we propose that strain SaA2.12T represents a novel species with the name Flavobacterium salilacus sp. nov., with the type strain SaA2.12T (=KCTC 72220T=MCCC 1K03618T) and strain LaA7.5T as a subspecies within novel Flavobacterium salilacus with the name Flavobacterium salilacus subsp. altitudinum subsp. nov., with the type strain LaA7.5T (=KCTC 72806T=MCCC 1K04372T). These propositions automatically create Flavobacterium salilacus subsp. salilacus subsp. nov. with SaA2.12T (=KCTC 72220T=MCCC 1K03618T) as the type strain.
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