There is little interest to know about the effect of oxygen in fixing the nitrogen in the root nodules of the plants. One of the reasons for this is the encouragement of the belief that the presence of anaerobically nitrogen-fixing organisms will have little effect. Another reason is the difficulty in conducting prolonged and arduous experiments, and the problems in differentiating the formative and functional effects.
The organisms that involve in aerobic nitrogen fixation need oxygen for the production of adenosine triphosphate (ATP). Along with this, they also need nitrogenase for protection. There will be a restriction of oxygen supply to the bacteroid zone by the barrier in the variable diffusion.
Within the root nodules of the legumes, the nitrogen is taken from the atmosphere and transformed into ammonia, which is then formed into the building blocks of proteins and nucleic acids called amino acids and nucleotides, respectively. It is also converted into other constituents like flavones, vitamins, and hormones. Legumes can fix gaseous nitrogen, which makes it an organism that is ideal for agriculture. When there is high nitrogen content, the development of nodule is blocked as the plant does not get benefitted from the symbiosis.
A product of photosynthesis is a sugar that provides energy for the nitrogen gas splitting. When sucrose breaks down, it forms a product called malate and this acts as a direct source of carbon for the bacteroid. Fixation of nitrogen in the nodule is extremely sensitive to oxygen. The nodules of legumes contain leghaemoglobin, an iron-containing protein. In animals, this can be related to myoglobin. These two helps in oxygen diffusion in the process of respiration.
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