Symbiotic N2 fixation is important biological process in the development of sustainable agriculture. It is achieved by bacteria inside the cells of de novo formed organs, the nodules, which usually develop on roots of various leguminous plants. This mutualistic relationship is beneficial for both symbiotic partners; the host plant provides the rhizobia with carbon and a source of energy for growth and functions while the rhizobia fix atmospheric N2 and provide the plant with a source of reduced nitrogen in the form of ammonium. To increase knowledge of this vital process of particular...