Abstract
Members of the genus Bradyrhizobium are well-known as nitrogen-fixing microsymbionts of a wide variety of leguminous species, but they have also been found in different environments, notably as endophytes in non-legumes such as sugarcane. This study presents a detailed polyphasic characterization of four Bradyrhizobium strains (type strain BR 10280T), previously isolated from roots of sugarcane in Brazil. 16S rRNA sequence analysis, multilocus sequence analysis (MLSA) and analysis of the 16S-23S rRNA internal transcribed spacer showed that these strains form a novel clade close to, but different from B. huanghuaihaiense strain CCBAU 23303T. Average nucleotide identity (ANI) analyses confirmed that BR 10280T represents a novel species. Phylogenetic analysis based on nodC gene sequences also placed the strains close to CCBAU 23303T, but different from this latter strain, the sugarcane strains did not nodulate soybean, although they effectively nodulated Vigna unguiculata, Cajanus cajan and Macroptilium atropurpureum. Physiological traits are in agreement with the placement of the strains in the genus Bradyrhizobium as a novel species for which the name Bradyrhizobium sacchari sp. nov. is proposed.
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Acknowledgements
The authors are grateful to Fernanda dos Santos Dourado, Natália Neutzling Camacho and Karine Moura de Freitas (Embrapa Agrobiologia) for technical support. Financial support by CNPq (projeto Universal process 477231/2012-8) and Faperj (processos E-26/111.398/2012 and E-26/010.001282/2015). The first author received a post-graduate fellowship from CNPq. The genome sequences of Bradyrhizobium daqingense (JGI Project ID: 1041378) and B. huanghuaihaiense (JGI Project ID: 1041383) were provided by a collaboration between the China General Microbiological Culture Collection Center and the US Department of Energy Joint Genome Institute, a DOE Office of Science User Facility, supported under Contract No. DE-AC02-05CH11231.
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Communicated by Erko Stackebrandt.
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203_2017_1398_MOESM1_ESM.pptx
Fig. S1 Maximum likelihood phylogram estimated from 583 nucleotide positions of the internally transcribed spacer (ITS) between the 16S and 23S rRNA genes. Bootstrap values are shown when the represented relationships were observed in at least 50% of 500 pseudoreplicates. The ML tree was obtained using the Kimura 2-parameter +G model. The scale bar represents the number of base pair substitutions per site. Genbank accession numbers are shown between parentheses. (PPTX 49 kb)
203_2017_1398_MOESM2_ESM.pptx
Fig. S2 Maximum likelihood phylogram estimated from 441 nucleotide positions of the nodC gene. Bootstrap values are shown when the represented relationships were observed in at least 50% of 500 pseudoreplicates. The ML tree was obtained using the Kimura 3-parameter +G +I model. The scale bar represents the number of base pair substitutions per site. Genbank accession numbers are shown between parentheses. (PPTX 55 kb)
203_2017_1398_MOESM4_ESM.docx
Table S2 Percentage of nucleotide sequence similarity between gene sequences of Bradyrhizobium sacchari strain BR 10280T and other strains. (DOCX 20 kb)
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de Matos, G.F., Zilli, J.E., de Araújo, J.L.S. et al. Bradyrhizobium sacchari sp. nov., a legume nodulating bacterium isolated from sugarcane roots. Arch Microbiol 199, 1251–1258 (2017). https://doi.org/10.1007/s00203-017-1398-6
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DOI: https://doi.org/10.1007/s00203-017-1398-6