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Int J Syst Evol Microbiol 54 (2004), 847-850; DOI  10.1099/ijs.0.02966-0
© 2004 International Union of Microbiological Societies

Pseudomonas lutea sp. nov., a novel phosphate-solubilizing bacterium isolated from the rhizosphere of grasses

Alvaro Peix1, Raúl Rivas2, Ignacio Santa-Regina1, Pedro F. Mateos2, Eustoquio Martínez-Molina2, Claudino Rodríguez-Barrueco1 and Encarna Velázquez2

1 Instituto de Recursos Naturales y Agrobiología, CSIC, Salamanca, Spain
2 Departamento de Microbiología y Génetica, Lab. 209, Edificio Departamental de Biología, Campus M. Unamuno, Universidad de Salamanca, 37007 Salamanca, Spain

Correspondence
Encarna Velázquez
evp{at}usal.es

A phosphate-solubilizing bacterial strain designated OK2T was isolated from rhizospheric soil of grasses growing spontaneously in a soil from Spain. Cells of the strain were Gram-negative, strictly aerobic, rod-shaped and motile. Phylogenetic analysis of the 16S rRNA gene indicated that this bacterium belongs to the {gamma}-subclass of Proteobacteria within the genus Pseudomonas and that the closest related species is Pseudomonas graminis. The strain produced catalase but not oxidase. Cellulose, casein, starch, gelatin and urea were not hydrolysed. Aesculin was hydrolysed. Growth was observed with many carbohydrates as carbon sources. The main non-polar fatty acids detected were hexadecenoic acid (16 : 1), hexadecanoic acid (16 : 0) and octadecenoic acid (18 : 1). The hydroxy fatty acids detected were 3-hydroxydecanoic acid (3-OH 10 : 0), 3-hydroxydodecanoic acid (3-OH 12 : 0) and 2-hydroxydodecanoic acid (2-OH 12 : 0). The G+C DNA content determined was 59·3 mol%. DNA–DNA hybridization showed 48·7 % relatedness between strain OK2T and P. graminis DSM 11363T and 26·2 % with respect to Pseudomonas rhizosphaerae LMG 21640T. Therefore, these results indicate that strain OK2T (=LMG 21974T=CECT 5822T) belongs to a novel species of the genus Pseudomonas, and the name Pseudomonas lutea sp. nov. is proposed.

Published online ahead of print on 28 November 2003 as DOI 10.1099/ijs.0.02966-0.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain OK2T is AY364537.




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A. Peix, O. Berge, R. Rivas, A. Abril, and E. Velazquez
Pseudomonas argentinensis sp. nov., a novel yellow pigment-producing bacterial species, isolated from rhizospheric soil in Cordoba, Argentina
Int J Syst Evol Microbiol, May 1, 2005; 55(3): 1107 - 1112.
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