NDLI: Rhodobaculum claviforme gen. nov., sp. nov., a new alkaliphilic nonsulfur purple bacterium

Content Provider	Springer Nature Link
Author	Bryantseva, I. A. Gaisin, V. A. Gorlenko, V. M.
Copyright Year	2015
Abstract	Two alkaliphilic strains of nonsulfur purple bacteria (NPB), B7-4 and B8-2, were isolated from moderately saline alkaline steppe lakes in southeast Siberia with pH values above 9.0. The isolates were motile, polymorphous cells (from short rods to long spindly cells) 1–2.5 × 2.5–7 μm. Intracellular membranes of vesicular type were mostly located at the cell periphery. The microorganisms contained bacteriochlorophyll a and carotenoids of the spheroidene and spirilloxanthin series. The photosynthetic apparatus was represented by LH2 and LH1 light-harvesting complexes. In the presence of organic compounds, the strains grew aerobically in the dark or anaerobically in the light. Capacity for photo- and chemoautotrophic growth was not detected. The cbbL gene encoding RuBisCO was not revealed. Optimal growth of both strains occurred at 2% NaCl (range from 0.5 to 4%), pH 8.0–8.8 (range from 7.5 to 9.7), and 25–35°C. The DNA G+C content was 67.6–69.8 mol %. Pairwise comparison of the nucleotides of the 16S rRNA genes revealed that strains B7-4 and B8-2 belonged to the same species (99.9% homology) and were most closely related to the aerobic alkaliphilic bacteriochlorophyll a-containing anoxygenic phototrophic bacterium (APB) Roseibacula alcaliphilum De$^{T}$ (95.2%) and to NPB strains Rhodobaca barguzinensis VKM B-2406$^{T}$ (94.2%) and Rbc. bogoriensis LBB1$^{T}$ (93.9%). The isolates were closely related to the NPB Rhodobacter veldkampii DSM 11550$^{T}$ (94.8%) and to aerobic bacteriochlorophyll a-containing bacteria Roseinatronobacter monicus ROS 35$^{T}$ and Roseicitreum antarcticul ZS2-28$^{T}$ (93.5 and 93.9%, respectively). New strains were described as a new NPB genus and species of the family Rhodobacteriaceae, Rhodobaculum claviforme gen. nov., sp. nov., with B7-4$^{T}$ (VKM B-2708, LMG 28126) as the type strain.
Starting Page	247
Ending Page	255
Page Count	9
File Format	PDF
ISSN	00262617
Journal	Microbiology
Volume Number	84
Issue Number	2
e-ISSN	16083237
Language	English
Publisher	Pleiades Publishing
Publisher Date	2015-04-08
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	nonsulfur purple bacteria taxonomy extremophiles alkaliphiles soda lakes Rhodobaculum claviforme Microbiology Medical Microbiology
Content Type	Text
Resource Type	Article
Subject	Microbiology Applied Microbiology and Biotechnology

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