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Abstract

An oval- to rod-shaped, motile, Gram-stain-negative, oxidase-positive, catalase-negative, pink-coloured phototrophic bacterium (designated as strain JA968) was isolated from an estuary near Pata, Gujarat, India. Cells had an intracytoplasmic membrane architecture as lamellae and divided by budding. Strain JA968 had bacteriochlorophyll- and spirilloxanthin series carotenoids as photosynthetic pigments. The strain exhibited photolithoautotrophic, photoorganoheterotrophic and chemoorganoheterotrophic growth modes and required thiamine as a growth factor. Strain JA968 had Cω7/C ω6 as the predominant fatty acid with ubiquinone-10 (Q-10) and menaquinone-10 (MK-10) forming the quinone composition. The genomic DNA G+C content of the strain was 63.5 mol%. Pairwise comparison of 16S rRNA gene sequences showed that strain JA968 was highly similar to DSM 2698 (99.9 %) and DSM 17143 (98.4 %). The average nucleotide identity values were 92 % between strain JA968 and DSM 2698, and 78 % between strain JA968 and DSM 17143. The digital DNA–DNA hybridization values between strain JA968 and and were 49 and 19 %, respectively. The genomic distinction was also supported by differences in phenotypic and chemotaxonomic characteristics. We propose that strain JA968 represents a new species of the genus with the name sp. nov. The type strain is JA968 (=KCTC 15634=NBRC 113338).

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2019-10-08
2024-12-08
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