Аннотация:The rhizobia comprise a diverse group of organisms that elicit hypertrophic growth on the roots of legume plants to form a new organ, the root nodule, which they inhabit to fix nitrogen. This endosymbiotic association makes legume plants auto- trophic for external nitrogen, an essential nutrient for plant growth. Because the interaction with rhizobia is highly benefi- cial, legume plants have evolved a set of genes encoding nodulekpecific proteins (nodulins; Legocki and Verma,