Leghaemoglobin found in the root nodules of leguminous plants primarily functions to:
Scavenge oxygen to protect nitrogenase from O2-induced inactivation
In the root nodules of leguminous plants, the enzyme nitrogenase, produced by symbiotic Rhizobium bacteria, converts atmospheric nitrogen into ammonia. Nitrogenase, however, is irreversibly inactivated by oxygen.
Leghaemoglobin, a pink pigment present in the nodules, binds oxygen and keeps its free concentration very low, scavenging it so that it protects the oxygen-sensitive nitrogenase enzyme from inactivation while still permitting the aerobic respiration the bacteria need.
It does not transport sucrose, absorb phosphorus, or supply nitrogen gas to the bacteria; those are not its role.
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