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Springer, Antonie van Leeuwenhoek, 4(107), p. 991-1000, 2015

DOI: 10.1007/s10482-015-0391-9

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Kushneria pakistanensis sp. nov., a novel moderately halophilic bacterium isolated from rhizosphere of a plant (Saccharum spontaneum) growing in salt mines of the Karak area in Pakistan

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The taxonomic position of a Gram-stain negative, moderately halophilic bacterium, designated NCCP-934T, was investigated using polyphasic taxonomic approach. The strain NCCP-934T was isolated from rhizosphere of a plant (Saccharum spontaneum, family Poaceae) growing in salt mines area in the Karak district of Khyber Pakhtunkhwa Province, Pakistan. Cells of strain NCCP-934T are rod shaped and motile. The bacterium is strictly aerobic, can grow at a temperature range of 10–40°C (optimum at 30–33ºC) and in a pH range of 6.0–10.5 (optimum pH 7.0-9.0). The strain can tolerate 1–30% (w/v) NaCl (optimal growth occurs in the presence of approximately 3–9% NaCl). The phylogenetic analysis based on the 16S rRNA gene sequence, showed that strain NCCP-934T belongs to the genus Kushneria with the highest sequence similarity to K. marisflavi SW32T (98.9%), K. indalinina CG2.1T (98.7%), K. avicenniae MW2aT (98.4%) and less than 97% similarity with other related species (94.7% with the type species of the genus, K. aurantia A10T). DNA–DNA relatedness between strain NCCP-934T and the type strains of the closely related species was lower than 18%. The chemotaxonomic data (major respiratory quinone, Q9; predominant fatty acids, C18:1 ω7c and C16:0 followed by C12:0 3-OH and Summed features 3 (C16:1 ω7c / iso-C15:0 2-OH); major polar lipids, diphosphatidyl glycerol, phosphatidyl glycerol, phosphatidyl monomethylethanol, phosphatidyl serine, phosphatidyl inositol and three polar lipid of unknown structure) supported the affiliation of strain NCCP-934T within the genus Kushneria. The DNA G+C content of strain NCCP-934T was 59.2 mol%. On the basis of phenotypic, chemotaxonomic and phylogenetic data, strain NCCP-934T can be distinguished from the closely related taxa and thus represents a novel species in the genus Kushneria, for which the name Kushneria pakistanensis sp. nov. is proposed, with the type strain NCCP-934T (=LMG 28525T = KCTC 42082T = JCM 18802T).