Leghaemoglobin -
Myoglobin like proteins called leghaemoglobins are formed in the nodules. This protein appears to be encoded by both plant and Rhizobium genes.
The plant codes for the apoprotein of leghaemoglobin. There is evidence that the haeme moiety of the protein is synthesized in the bacteroid.
This might be the basis of the interdependence between the plant and the bacterium for nitrogen fixation.
The function of leghaemoglobin appears to be the transport of optimal amount of oxygen for ATP production.This ensures that excess of oxygen does not inactivate nitrogenase.
