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Published online ahead of print on 31 July 2009 as doi:ijs.0.011973-0
 Int J Syst Evol Microbiol (2009); DOI 10.1099/ijs.0.011973-0
© 2009 International Union of Microbiological Societies
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Paenibacillus riograndensis sp. nov., a nitrogen-fixing species isolated from the rhizosphere of Triticum aestivum

Anelise Beneduzi1, Pedro Beschoren da Costa1, Márcia Parma2, Itamar S. Melo2, Maria Helena Bodanese-Zanettini1 and Luciane Maria Pereira Passaglia1,3

1 Universidade Federal do Rio Grande do Sul;
2 EMBRAPA

3 E-mail: lpassaglia{at}terra.com.br

A bacterial strain designated SBR5T was isolated from the rhizosphere of Triticum aestivum. A phylogenetic analysis based on the 16S rRNA gene sequence placed the isolate within the genus Paenibacillus, being most closely related to P. graminis species, showing 98.1% similarity with P. graminis RSA19T. The isolate was a Gram-variable, motile, facultatively anaerobic bacterium, with spores in terminal position in cells. Starch is utilized and dihydroxyacetone and catalase were produced. Strain SBR5T displays plant growth promoting rhizobacteria characteristics: ability to fix nitrogen, to produce siderophores and indole-3-acetic acid. The DNA G+C content was 55.1 mol%. Chemotaxonomic analysis of the isolated strain revealed that MK-7 was the predominant menaquinone, while the major fatty acid was anteiso-C15:0. The values for DNA-DNA hybridization between strain SBR5T and P. graminis RSA19T, P. odorifer TOD45T and P. borealis KK19T strains were 43%, 35% and 28%, respectively. These DNA relatedness data and the results of phylogenetic and phenotypic analyses showed that strain SBR5T should be considered as the nitrogen-fixing type strain of a novel species of the genus Paenibacillus, for which the name Paenibacillus riograndensis sp. nov. is proposed. The type strain is SBR5T (= CCGB 1313T = CECT 7330T).






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