Microvirga pakistanensis sp. nov., a novel bacterium isolated from desert soil of Cholistan, Pakistan
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A Gram-negative, non-spore-forming, non-pigmented, strictly aerobic and non-motile short rod bacterium, designated NCCP-1258T, was isolated from Cholistan desert soil, Bahawalpur, Pakistan. Growth of strain NCCP-1258T was observed at pH range 6.5–9.5 (optimum 7.5–8.5) and temperature range 20–45 °C (optimum 40 °C), and it tolerated 0–2 % NaCl (optimum 0.5 %, w/v). Phylogenetic analysis based on 16S rRNA gene sequence comparison revealed that strain NCCP-1258T belongs to genus Microvirga and is most closely related to Microvirga lotononidis (98.0 %), Microvirga vignae (97.4 %), Microvirga lupini (97.2 %), Microvirga zambiensis (97.2 %) and Microvirga flocculans (97.1 %). Analysis of the concatenated sequences of four housekeeping gene loci (dnaK, gyrB, recA and rpoB) also confirmed the placement of strain NCCP-1258T within the genus Microvirga. DNA–DNA relatedness values of NCCP-1258T with above-mentioned type strains were less than 42 %. The DNA G+C content of strain NCCP-1258T was 64.3 mol%. Chemotaxonomic data (predominant menaquinone system was Q-10; major fatty acids were C16:0, C18:1 ω7c and C19:0 cyclo ω8c; the polar lipid profile contained diphosphatidylglycerol, phosphatidylcholine, phosphatidyl dimethyl ethanolamine and phosphatidyl ethanolamine) also supported the affiliation of strain NCCP-1258T to the genus Microvirga. On the basis of physiological and biochemical characteristics, phylogenetic analyses and DNA–DNA relatedness, strain NCCP-1258T can be distinguished from the closely related taxa and thus represents a novel species of the genus Microvirga, for which the name Microvirga pakistanensis sp. nov. is proposed with the type strain NCCP-1258T (=CGMCC 1.15074T = KCTC 42496T).
KeywordsMicrovirga pakistanensis Cholistan desert Moderately thermotolerant
This work was supported by the Key Project of International Cooperation of Ministry of Science and Technology (MOST) (No. 2013DFA31980) and the Deanship of Scientific Research at King Saud University for funding this work through the research group no. RGP-1436–27. W.-J. Li was also supported by the Hundred Talents Program of Chinese Academy of Sciences and Guangdong Province Higher Vocational Colleges and Schools Pearl River Scholar Funded Scheme (2014). We are greatly thankful to Dr Julie K. Ardley from Centre for Rhizobium Studies, Murdoch University Australia for providing us type strains M. lotononidis WSM3557T, M. lupini Lut6T and M. zambiensis WSM3693T.
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