**6. Nitrogen fluxes in the plant and fungus symbiosis**

Mycorrhizal fungi can use nitrogen in two forms, that is, organic or inorganic, from soil matrix and make their availability to plants. Different research studies carried out by researchers show that ammonium, nitrates, and urea marked with N15. This form of nitrogen is translocated in the hyphae in the form of arginine, though it is quickly converted and then transformed into ammonium ion immediately, while the carbon skeletons created throughout the excruciating of the arginine are reincorporated again into the fungal groups. Now, it is easy to understand how the external hyphae of the ECM incarcerate inorganic nitrogen as nitrate ion, NH4 + , and organic nitrogen as amino acids and distribute occasionally a huge fraction of them to the plants.
