Name the most crucial enzyme found in root nodules for N2 fixation? Does it require a special pink coloured pigment for its functioning? Elaborate.
Nitrogenase is the most crucial enzyme that is required for N2 fixation. Nitrogenase is extremely sensitive to oxygen, and this pink-coloured pigment called leghemoglobin acts as an oxygen scavenger and creates an anaerobic condition that is necessary for the normal functioning of nitrogenase.