Morphology: It is rod-shaped and typically occurs in pairs or chains.
Gram Stain: Gram-negative
Metabolism: Rhizobium leguminosarum is chemoorganotrophic, using organic compounds for energy.
Habitat: Found in the soil, it forms nodules in the roots of leguminous plants, where it fixes nitrogen. This bacterium is environmentally significant because of its role in improving soil fertility and promoting sustainable agriculture by naturally enhancing nitrogen availability.