Tour of Microbes  Tour Home | Disease Home | Microbes A to Z | Bio 203 Home
Rhizobium is a Gram-negative rod-shaped bacterium that lives as a symbiont in the root nodules of leguminous plants (alfalfa, pea). There, it carries out nitrogen fixation for the plant in return for minerals and organic matter supplied by the plant.
Class α - Proteobacteria
Bergey's Manual Volume 2: The Proteobacteria