What benefits of Bradyrhizobium vigna have been cited in the scientific literature?
Peer-reviewed research cites 11 benefits for Bradyrhizobium vigna, a nitrogen-fixing rhizobium studied in legume inoculation systems. Formulators researching Bradyrhizobium vigna potential claims will find the literature focused on nodulation, yield, and performance in metal-stressed soils.
In greengram trials under elevated nickel and zinc conditions, inoculation was reported to increase nodule numbers by up to 82%, leghaemoglobin content by up to 120%, and seed yield by up to 36% versus uninoculated controls. Grain protein content rose 13% under both stress conditions, and root and shoot nitrogen improved — all cited in peer-reviewed research, not approved label claims.
The organism tolerates nickel up to 300 µg/mL and zinc up to 1,400 µg/mL in vitro, suggesting potential utility in metal-contaminated soils. It was also reported to reduce plant uptake of both metals in greengram, and to produce indole acetic acid (IAA), siderophores, HCN, and ammonia even under metal stress.
Research identifies Bradyrhizobium as a key diazotroph across multiple drought-tolerant legume species in arid soils, and mycorrhizal inoculants paired with the BR3267 strain were reported more effective than the Microvirga BR3296 strain for cowpea growth promotion.
1AAPFCO-accepted claims
Listing details- Beneficial to plants and/or soils.
Accepted wording, shown verbatim · source: AAPFCO Plant Biostimulant list
2Potential claims from the literature
Reported to produce indole acetic acid (IAA) in vitro, with production levels maintained in the presence of nickel and zinc
Reported to produce siderophores, HCN, and ammonia both in the absence and presence of nickel and zinc
Reported to enhance nodule numbers in greengram by 82% at elevated nickel concentrations and by 50% at elevated zinc concentrations compared to uninoculated controls
Reported to increase leghaemoglobin content in greengram by 120% at elevated nickel concentrations and by 100% at elevated zinc concentrations compared to uninoculated controls
Reported to increase seed yield in greengram by 34% at elevated nickel concentrations and by 36% at elevated zinc concentrations compared to uninoculated controls
Reported to increase grain protein content in greengram by 13% under both elevated nickel and zinc soil conditions compared to uninoculated controls
Reported to increase root and shoot nitrogen content in greengram under elevated nickel and zinc soil conditions compared to uninoculated controls
Reported to reduce uptake of nickel and zinc by plant organs in greengram compared to uninoculated plants grown in metal-contaminated soils
Reported to tolerate high concentrations of nickel (up to 300 µg/mL) and zinc (up to 1400 µg/mL) in vitro, suggesting potential utility in metal-contaminated soils
Mycorrhizal inoculants associated with Bradyrhizobium BR3267 strain were reported to be more effective than the Microvirga BR3296 strain in promoting cowpea growth
Reported as an important diazotroph genus identified across multiple drought-tolerant legume species grown in arid soils, suggesting a role in nitrogen fixation in these systems
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