Nitrogen-Fixation Mutualism
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Rhizobia bacteria fix atmospheric nitrogen inside legume root nodules, trading fixed nitrogen for photosynthetic sugars in a mutually beneficial relationship.
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Soybean root nodules house rhizobia that supply the plant with usable nitrogen, while the plant supplies the bacteria with carbohydrates.
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Do not credit the legume with fixing nitrogen— the plant cannot fix nitrogen itself; only the bacterial partner carries the enzyme machinery.