1887

Abstract

Three strains (so36, so42 and wo26) representing a novel Gram-negative, obligately aerobic, bacteriochlorophyll -containing species of the -4 subgroup of the were isolated from freshwater lakes using a high-throughput cultivation technique. The non-motile and slender rod-shaped cells formed orange–red-pigmented colonies. The main carotenoids were nostoxanthin and keto-nostoxanthin. According to the absorption spectrum, two different photosynthetic light-harvesting complexes, an LHI complex and a B800-830-type peripheral LHII complex, were present in the cells. The predominant fatty acids of strain so42 were hexadecenoic acid (16 : 17) and octadecenoic acid (18 : 17), whereas 17 : 16 and 14 : 0 iso 2-OH were present in smaller amounts. The main polar lipids were phosphatidylethanolamine, phosphatidylglycerol, phosphatidylcholine, diphosphatidylglycerol, glycolipid and sphingoglycolipids. The major respiratory lipoquinone was ubiquinone-10, whereas ubiquinone-9 was present in smaller amounts. The three strains were cytochrome oxidase-negative and catalase-positive and formed alkaline and acid phosphatases. The strains grew chemoorganoheterotrophically in mineral media supplemented with various organic acids, amino acids or complex substrates such as peptone and yeast extract. The G+C content of the genomic DNA of strain so42 was 64·3 mol%. The three novel isolates contained the same 16S rRNA gene sequence. The 16S rRNA gene sequence similarity to the closest phylogenetic relative was only 92·8 %. Accordingly, the three strains represent a new genus and species, for which the name gen. nov., sp. nov., is proposed, with strain so42 (=DSM 17366=CECT 7086) as the designated type strain.

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2006-04-01
2020-06-07
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