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Paenibacillus rhizosphaerae sp. nov., isolated from the rhizosphere of Cicer arietinum

¹ Departamento de Microbiología y Genética, Lab. 209, Edificio Departamental de Biología, Universidad de Salamanca, Campus M. Unamuno, 37007 Salamanca, Spain
² Departamento de Microbiología y Parasitología, Facultad de Farmacia, Universidad de Sevilla, 41012 Sevilla, Spain
³ Cátedra de Microbiología Agrícola, Facultad de Agronomía, Universidad de Córdoba, Argentina

Correspondence
Encarna Velázquez
evp{at}gugu.usal.es

Two sporulating bacterial strains designated CECAP06^T and CECAP16 were isolated from the rhizosphere of the legume Cicer arietinum in Argentina. Almost-complete 16S rRNA gene sequences identified the isolates as a Paenibacillus species. It was most closely related to Paenibacillus cineris LMG 18439^T (99·6 % sequence similarity), Paenibacillus favisporus LMG 20987^T (99·4 % sequence similarity) and Paenibacillus azoreducens DSM 13822^T (97·7 % sequence similarity). The cells of this novel species were motile, sporulating, rod-shaped, Gram-positive and strictly aerobic. The predominant fatty acids were anteiso-C_{15 : 0}, C_{16 : 0} and iso-C_{16 : 0}. The DNA G+C content of strains CECAP06^T and CECAP16 was 51·3 and 50·9 mol%, respectively. Growth was observed from many carbohydrates, but gas production was not observed from glucose. Catalase and oxidase activities were present. The isolates produced -galactosidase and hydrolysed aesculin. Gelatinase, caseinase and urease were not produced. The results of DNA–DNA hybridization showed that the strains from this study constitute a novel species of the genus Paenibacillus, for which the name Paenibacillus rhizosphaerae sp. nov. is proposed. The type strain is CECAP06^T (=LMG 21955^T=CECT 5831^T).

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains CECAP06^T and CECAP16 are AY751754 and AY751755, respectively.

Micrographs of spores of strain CECAP06^T and a full phylogenetic tree are available as supplementary material in IJSEM Online.

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