What enzyme is involved in converting N2 to NH4 in the root nodules of legumes?

The enzyme involved in converting nitrogen gas (N2) to ammonium (NH4+) in the root nodules of legumes is nitrogenase. This enzyme catalyzes the reduction of atmospheric nitrogen, facilitating its assimilation by the plant. Nitrogenase operates in a symbiotic relationship with nitrogen-fixing bacteria, such as Rhizobium, which reside within the root nodules. The process is crucial for providing the plant with usable nitrogen, essential for its growth and development.