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Rhizobium is a nitrogen-fixing root nodule bacterial symbiont. It belongs to the genus of Gram-negative soil bacteria. It attacks the root nodules of the plants and converts the atmospheric nitrogen into organic nitrogen or ammonia. Rhizobium is a soil habitat Gram negative bacterium which is associated symbiotically with the roots of leguminous plant. The symbiosis is based on specific recognition of signal molecules produced by bacteria and its plant partners .Process of symbiosis results in biological nitrogen fixation in which nitrogen (N 2) is converted into ammonia (NH 3) and is subsequently available for plants and in turn plants provide nutrients to the bacteria .This genus of bacteria is aerobic in nature and ... Legume–rhizobia symbiosis contributes significantly to the balance of the N cycle globally through the process called symbiotic nitrogen fixation (SNF). The amount of nitrogen fixed through biologic nitrogen fixation is in the range of 139–175 million tons of nitrogen, whereas SNF contributes about 35–44 million tons of nitrogen. Rhizobia are the microsymbiont associated with legume plants in root nodules and fix nitrogen through the nitrogenase system. The current status on the ... Rhizobium is defined as a gram-negative bacterium that serves as a nitrogen fixer in leguminous plants, forming root nodules to convert atmospheric nitrogen into ammonia and nitrates, which are then utilized by the plants for synthesizing amino acids and nucleotides. AI generated definition based on: Journal of Biotechnology, 2022
