期刊
ARCHIVES OF MICROBIOLOGY
卷 201, 期 10, 页码 1351-1359出版社
SPRINGER
DOI: 10.1007/s00203-019-01701-4
关键词
Blastochloris tepida; Bacteriochlorophyll b; Purple nonsulfur bacteria; Hot spring phototrophic bacteria
类别
资金
- NASA Exobiology Program
- JSPS KAKENHI grant [17H05231]
- United States Department of Energy Office of Biological and Environmental Research
- Grants-in-Aid for Scientific Research [17H05231] Funding Source: KAKEN
A new taxon is created for the thermophilic purple nonsulfur bacterium previously designated as Rhodopseudomonas strain GI. Strain GI was isolated from a New Mexico (USA) hot spring microbial mat and grows optimally above 40 degrees C and to a maximum of 47 degrees C. Strain GI is a bacteriochlorophyll b-containing species of purple nonsulfur bacteria and displays a budding morphology, typical of species of the genus Blastochloris. Although resembling the species Blc. viridis in many respects, the absorption spectrum, carotenoid content, and lipid fatty acid profile of strain GI is distinct from that of Blc. viridis strain DSM133(T) and other recognized Blastochloris species. Strain GI forms its own subclade within the Blastochloris clade of purple nonsulfur bacteria based on comparative 16S rRNA gene sequences, and its genome is significantly larger than that of strain-DSM133(T); average nucleotide identity between the genomes of Blc. viridis and strain GI was below 85%. Moreover, concatenated sequence analyses of PufLM and DnaK clearly showed strain GI to be distinct from both Blc. viridis and Blc. sulfoviridis. Because of its unique assortment of properties, it is proposed to classify strain GI as a new species of the genus Blastochloris, as Blc. tepida, sp.n., with strain-GI(T) designated as the type strain (= ATCC TSD-138 = DSM 106918).
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