Ask the Chatbot Games & Quizzes History & Society Science & Tech Biographies Animals & Nature Geography & Travel Arts & Culture ProCon Money Videos
Britannica Sources used in this answer

How do nitrogen-fixing bacteria form root nodules on legumes?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
A labeled diagram of a periodic table entry for nitrogen shows its atomic number 7, symbol N, electron configuration, atomic weight, and name. Symbols indicate nitrogen is a nonmetal gas at room temperature, has a hexagonal crystal structure, and strongly acidic higher-valence oxides. A key explains the diagram's icons and color coding.
nitrogen

Symbiotic nitrogen-fixing bacteria, such as Rhizobium, facilitate the development of root nodules on legumes through a specific biological process. These bacteria invade the root hairs of the host plant, where they begin to multiply. This invasion stimulates the formation of root nodules, which are characterized as enlargements consisting of both plant cells and bacteria in an intimate association.1

Within these nodules, the bacteria perform nitrogen fixation, converting atmospheric nitrogen into ammonia. The host plant then utilizes this ammonia for its own development, illustrating a mutually beneficial relationship within the nitrogen cycle.1