What does the published scientific research say about Rhizobium phaseoli?

Rhizobium phaseoli is an alphaproteobacterium and nitrogen-fixing symbiont of Phaseolus vulgaris (common bean). Eight PubMed records indexed here span nodulation genetics, exo-metabolite profiling, soil persistence, and biofertilizer trials — a broad research base for growers and formulators asking what the peer-reviewed literature says about Rhizobium phaseoli in common bean production.

Co-inoculation of common bean seeds with Rhizobium phaseoli and plant growth-promoting rhizobacteria (PGPR) is reported in peer-reviewed research to improve pod count, seed weight, and protein content under field conditions. Separate work documents that R. phaseoli strains produce distinct exo-metabolite profiles detectable by NMR, and that an EPS-producing strain designated Mn-6 improved plant height, root biomass, and photosynthesis rate in maize — experimental findings, not registered product claims.

Soil ecology research shows Rhizobium phaseoli inoculant strains can outcompete resident rhizobial populations for nodule occupancy on Phaseolus vulgaris roots and persist through winter fallow. Acid tolerance varies substantially by strain: all 16 strains tested in culture grew at pH 4.6, but only strains tolerating pH 3.8 survived in acid soils (pH 4.1–4.6), with acid-tolerant strains also showing greater aluminum tolerance — a relevant consideration when selecting R. phaseoli strains for acidic field conditions.