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Nesterenkonia aethiopica sp. nov., an alkaliphilic, moderate halophile isolated from an Ethiopian soda lake

Osvaldo Delgado, Jorge Quillaguamán, Shahrzad Bakhtiar, Bo Mattiasson, Amare Gessesse and Rajni Hatti-Kaul

Department of Biotechnology, Centre for Chemistry and Chemical Engineering, Lund University, PO Box 124, SE-221 00 Lund, Sweden

Correspondence
Rajni Hatti-Kaul
rajni.hatti-kaul{at}biotek.lu.se

Strain DSM 17733^T, isolated from the shore of Lake Abjata in Ethiopia, is a heterotrophic, alkaliphilic, moderately halophilic, Gram-positive, strictly aerobic, non-motile,non-endospore-forming bacterium. The organism grows optimally at 30–37 °C, pH 9 and 3 % (w/v) NaCl. Analysis of the cell wall showed the presence of murein of the type L-lys–gly–L-Glu, variation A4. The G+C content of the genomic DNA was 69.0 mol%. Sequence analysis of 16S rRNA gene sequence of strain DSM 17733^T placed the isolate in the genus Nesterenkonia. DNA–DNA hybridization of DSM 17733^T with those organisms with the closest phylogenetic affiliation, i.e. Nesterenkonia halobia, Nesterenkonia lacusekhoensis and Nesterenkonia xinjiangensis, gave relatedness values of 48.5 %, 63.7 % (repetition, 57.2 %) and 35.7 % (repetition, 29.3 %), respectively. On the basis of both phenotypic and phylogenetic criteria and the low levels of DNA–DNA relatedness with the phylogenetically closest species N. xinjiangensis and N. halobia, it is proposed that the isolate be classified in a novel species, Nesterenkonia aethiopica sp. nov. The type strain is DSM 17733^T (=CCUG 48939^T).

Electron micrographs of strain DSM 17733^T are available as supplementary material in IJSEM Online.

Present address: PROIMI-CONICET, Av. Belgrano y Pasaje Caseros, 4000 Tucumán, Argentina.

Present address: Department of Biology, Science Faculty, Addis Ababa University, PO Box 1176, Addis Ababa, Ethiopia.

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