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International Journal of Systematic and Evolutionary Microbiology
62, No. 7, 2012; Pages: 1698 - 702

Caenispirillum salinarum sp. nov., a member of the family Rhodospirillaceae isolated from a solar saltern

C. Ritika, K. Suresh and P. Anil Kumar

Microbial Type Culture Collection and Gene Bank, Institute of Microbial Technology (CSIR), Sector 39A, Chandigarh 160 036, India.


A novel Gram-negative, vibrio-shaped, motile bacterium, designated strain AK4T, was isolated from a sediment sample collected from a solar saltern at Kakinada, Andhra Pradesh, India. Strain AK4T was positive for oxidase, urease and DNase activities but negative for gelatinase, catalase, ornithine decarboxylase, lysine decarboxylase, nitrate reduction, aesculin, indole and lipase activities. The fatty acids were dominated by unsaturated components, with a high abundance of summed feature 8 (C18 : 1ω7c and/or C18:1ω6c) and C17:1ω6c. Strain AK4T contained Q-10 as the major respiratory quinone and phosphatidylglycerol, diphosphatidylglycerol, phosphatidylethanolamine and phosphatidylcholine as major polar lipids. The DNA G+C content of strain AK4T was 71.0 mol%. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain AK4T was most closely related to the type strain of Caenispirillum bisanense of the family Rhodospirillaceae (phylum ‘Proteobacteria’) (96.6% sequence similarity). It shared <93.2% 16S rRNA gene sequence similarity with other members of the family. Based on phenotypic characteristics and phylogenetic inference, strain AK4T is considered to represent a novel species of the genus Caenispirillum, for which the name Caenispirillum salinarum sp. nov. is proposed; the type strain is AK4T ( = MTCC 10963T = JCM 17360T).

Keywords: motile bacterium; phosphatidylglycerol; diphosphatidylglycerol; phosphatidylethanolamine; phosphatidylcholine;Caenispirillum bisanense; Rhodospirillaceae; Proteobacteria.



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