What does the published scientific research say about Bradyrhizobium japonicum?

Rhizosphere competitiveness is a recurring theme in Bradyrhizobium japonicum research. Published studies describe siderophore utilization — including ferrichrome, rhodotorulate, and pseudobactin St3 — for iron acquisition under nutrient-limited conditions, oxalotrophy as a reported advantage during root-nodule colonization, and bacteriocin-like substances in strain FN1 that are cited as influencing competition for nodule occupancy.

What does the research say about Bradyrhizobium japonicum as a crop inoculant? Peer-reviewed studies report growth-promoting effects in soybean and, separately, in maize via seed soaking, where B. japonicum inoculation is cited alongside shifts in rhizosphere microbiome structure and reduced abundance of fungal pathogens including Fusarium. Co-inoculation trials pairing B. japonicum E109 with free-living PGPRs are reported in the literature to mitigate arsenic phytotoxicity and lower arsenic accumulation in soybean aerial tissue under heavy-metal stress.