Image of Bradyrhizobium sp. Tv2a.2 using scanning electron microscopy. - Source:2Autotroph/Mixotroph
Aerobic, chemoorganotrophs, affiliated with the fixation of atmospheric nitrogen 3 4. Carbohydrates and organic acids are typically utilized as carbon sources for growth 3 4, however some strains of B. japonicum are able to grow autotrophically with H2 as an energy source 5. Denitrification of nitrate to nitrogen is also possible by this species. Young cultures of Bradyrhizobium occur as small rods, but become swollen in older cultures 3 4. No in situ information is available for the genus in wastewater treatment systems.
 Tian, Parker, Seshadri, Reddy, Markowitz, Ivanova, et al. - High-quality permanent draft genome sequence of Bradyrhizobium sp. Tv2a.2, a microsymbiont of Tachigali versicolor discovered in Barro Colorado Island of Panama. - Stand Genomic Sci 10(): 27. doi:10.1186/s40793-015-0006-0
 Hanus, Maier, Evans - Autotrophic growth of H2-uptake-positive strains of Rhizobium japonicum in an atmosphere supplied with hydrogen gas. - Proc. Natl. Acad. Sci. U.S.A. 76(4): 1788-92.
 Park, So - Altered cell surface hydrophobicity of lipopolysaccharide-deficient mutant of Bradyrhizobium japonicum. - J. Microbiol. Methods 41(3): 219-26.
 Cai, Wilkins, Chen, Ng, Lu, Jia, et al. - Metagenomic Reconstruction of Key Anaerobic Digestion Pathways in Municipal Sludge and Industrial Wastewater Biogas-Producing Systems. - Front Microbiol 7(): 778. doi:10.3389/fmicb.2016.00778