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Bradyrhizobium brasilense sp. nov., a symbiotic nitrogen-fixing bacterium isolated from Brazilian tropical soils

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Abstract

Four strains of rhizobia isolated from nodules of Vigna unguiculata (UFLA03-321T, UFLA03-320 and UFLA03-290) and Macroptilium atropurpureum (UFLA04-0212) in Brazilian soils were previously reported as a new group within the genus Bradyrhizobium. To determine their taxonomic position, these strains were characterized in this study using a polyphasic approach. The analysis of the 16S rRNA gene grouped the four strains with Bradyrhizobium pachyrhizi PAC48T. However, the concatenated sequence analysis of the two (recA and glnII) or three (atpD, gyrB and recA) housekeeping genes indicated that these strains represent a novel species of Bradyrhizobium, which is very closely related to B. pachyrhizi PAC48T and B. elkanii USDA 76T. Genomic relatedness analyses between the UFLA03-321T strain and B. elkanii USDA 76T and B. pachyrhizi PAC48T revealed an average nucleotide identity below 96% and values of estimated DNA–DNA hybridization below 70%, confirming that they represent genomically distinct species. Analysis of MALDI-TOF MS (Matrix-assisted laser desorption ionization-time-of-flight mass spectrometry) profiles and phenotypic characteristics also allowed differentiation of the novel species from its two neighboring species. In phylogenetic analysis of nodC and nifH genes, UFLA03-321T exhibited maximum similarity with B. tropiciagri CNPSo 1112T. The data suggest that these four UFLA strains represent a novel species, for which the name Bradyrhizobium brasilense sp. nov. is proposed, with UFLA03-321T (=LMG 29353 =CBAS645) as type strain. G + C content in the DNA of UFLA03-321T is 63.9 mol %.

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Acknowledgements

We thank the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) (Process: 99999.002753/2015-04), the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (Process: 304574/2010-4), and the Fundação de Amparo e Pesquisa de Minas Gerais (Fapemig) (PACCSS/PPGCS-2009–2012) for financial support and for granting scholarships.

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  1. Elaine Martins da Costa

    Present address: Universidade Federal de Mato Grosso Do Sul-Campus de Chapadão do Sul, Chapadão do Sul, MS, 79560-000, Brazil

Authors and Affiliations

  1. Setor de Biologia, Microbiologia e Processos Biológicos do Solo, Departamento de Ciência do Solo, Universidade Federal de Lavras, Campus UFLA, Lavras, MG, 37200-000, Brazil

    Elaine Martins da Costa, Amanda Azarias Guimarães, Rayssa Pereira Vicentin, Paula Rose de Almeida Ribeiro & Fatima Maria de Souza Moreira

  2. Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Paraná, Curitiba, PR, 81531990, Brazil

    Aniele Carolina Ribas Leão & Eduardo Balsanelli

  3. Department of Biochemistry and Microbiology, Ghent University, K.L. Ledeganckstraat 35, 9000, Ghent, Belgium

    Liesbeth Lebbe, Maarten Aerts & Anne Willems

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  1. Elaine Martins da Costa
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Correspondence to Fatima Maria de Souza Moreira.

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Communicated by Erko Stackebrandt.

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Martins da Costa, E., Azarias Guimarães, A., Pereira Vicentin, R. et al. Bradyrhizobium brasilense sp. nov., a symbiotic nitrogen-fixing bacterium isolated from Brazilian tropical soils. Arch Microbiol 199, 1211–1221 (2017). https://doi.org/10.1007/s00203-017-1390-1

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