1887

Abstract

Three Gram-stain-negative, non-motile, oxidase- and catalase-positive, rod-shaped, black, facultative phototrophic bacterial strains, RG-N-1a, DMA-N-7a and RA-N-9 were isolated from the water sample from Lake Fertő/Neusiedler See (Hungary). Phylogenetic analysis based on the 16S rRNA gene sequences revealed that the strains form a distinct linage within the family and their closest relatives are K13M18 (96.32%) followed by PAMC 27389 (96.25%). The novel bacterial strains prefer alkaline environments and grow optimally at 23–33 °C in the presence of NaCl (1–2 w/v%). Bacteriochlorophyll a was detected. Cells contained exclusively ubiquinone Q-10. The major cellular fatty acids were Cω7, Ciso ω5 C 3-OH and Cωc 11-methyl. The polar lipid profile contains diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylcholine, an unidentified phospholipid and four unidentified lipids. The assembled draft genome of RG-N-1a had 33 contigs with N50 values 315 027 nt, 96× genome coverage, total length of 4 326 551 bp and a DNA G+C content of 64.9%. Genome-based calculations (genome-to-genome distance and DNA G+C percentage) and pairwise amino acid identity (AAI <73.5%) indicate that RG-N-1a represents a novel genus. RG-N-1a (=DSM 108317=NCAIM B.02647) is suggested as the type strain of a novel genus and species in the family , for which the name gen. nov., sp. nov. is proposed.

Funding
This study was supported by the:
  • Nemzeti Kutatási Fejlesztési és Innovációs Hivatal (Award NKFIH-1157-8/2019-DT)
    • Principle Award Recipient: ErikaTóth
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2021-03-18
2024-03-28
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