Bacteria in root nodules, specifically rhizobia, engage in a symbiotic (mutualistic) relationship with leguminous host plants. In this exchange, the plant undergoes photosynthesis to produce sugars (carbohydrates), such as malate and succinate, which it transports to the root nodules to provide the bacteria with energy for nitrogen fixation.
Moreover, the host plant forms a physical structure (the nodule) that provides a controlled, anaerobic environment. This protects the bacteria and their oxygen-sensitive nitrogenase enzymes. The bacteria, in return, convert atmospheric nitrogen into ammonia, a form the plant can use for growth.
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