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Int J Syst Evol Microbiol 56 (2006), 2777-2781; DOI  10.1099/ijs.0.64480-0
© 2006 International Union of Microbiological Societies

Paenibacillus cellulosilyticus sp. nov., a cellulolytic and xylanolytic bacterium isolated from the bract phyllosphere of Phoenix dactylifera

Raúl Rivas{dagger}, Paula García-Fraile, Pedro F. Mateos, Eustoquio Martínez-Molina and Encarna Velázquez

Departamento de Microbiología y Genética, Edificio Departamental, Campus Miguel de Unamuno, Universidad de Salamanca, 37007 Salamanca, Spain

Correspondence
Raúl Rivas
raul{at}wwwedu-micro.usal.es

A bacterial strain designated PALXIL08T was isolated from the phyllosphere of Phoenix dactylifera bracts. A phylogenetic analysis based on the 16S rRNA gene sequence placed the isolate within the genus Paenibacillus in the same subgroup as Paenibacillus kobensis and Paenibacillus curdlanolyticus (98.9 and 97.9 % sequence similarity, respectively). The DNA hybridization values between the isolate and the type strains of Paenibacillus kobensis and Paenibacillus curdlanolyticus were found to be 27.4 and 17.6 %, respectively. The isolate comprised Gram-variable, facultatively anaerobic, motile, sporulating rods. Catalase and oxidase were produced and cellulose, xylan, starch and aesculin were hydrolysed. Many carbohydrates served as carbon sources for growth. MK-7 was the predominant menaquinone, and anteiso-C15 : 0 and iso-C16 : 0 were the major fatty acids. The DNA G+C content was 51 mol%. DNA relatedness data and the results of phylogenetic and phenotypic analyses showed that strain PALXIL08T should be considered as the type strain of a novel species of the genus Paenibacillus, for which the name Paenibacillus cellulosilyticus sp. nov. is proposed. The type strain is PALXIL08T (=LMG 22232T=CECT 5696T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain PALXIL08T is DQ407282.

An expanded phylogenetic tree for strain PALXIL08T and representative strains of the genus Paenibacillus is available as a supplementary figure in IJSEM Online.

{dagger}Present address: Laboratorium voor Microbiologie, Vakgroep Biochemie, Fysiologie en Microbiologie, Universiteit Gent, K. L. Ledeganckstraat 35, B-9000 Gent, Belgium.






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