What determines the efficiency of N(2)-fixing Rhizobium-legume symbioses?
Biological nitrogen fixation is vital to nutrient cycling in the biosphere and is the major route by which atmospheric dinitrogen (N(2)) is reduced to ammonia. The largest single contribution to biological N(2) fixation is carried out by rhizobia, which include a large group of both alpha and beta-proteobacteria, almost exclusively in association with legumes. Rhizobia must compete to infect roots of legumes and initiate a signaling dialog with host plants that leads to nodule formation. The ...Expand abstract
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