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

Raúl Rivas, 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 PALXIL08^T 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-C_{15 : 0} and iso-C_{16 : 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 PALXIL08^T 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 PALXIL08^T (=LMG 22232^T=CECT 5696^T).

An expanded phylogenetic tree for strain PALXIL08^T and representative strains of the genus Paenibacillus is available as a supplementary figure in IJSEM Online.

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

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