IntroductionLife on Earth requires large amounts of nitrogen inbiologically active forms. Nitrogen is found in abundance,however much of this resource is present in a chemicallybound form (dinitrogen-N2) that makes it difficult forintegration in metabolic pathways [1]. Certain lineages ofBacteria and Archea, the diazotrophs, evolved the nitrogenase enzyme complex, enabling these microbes tobreak the triple bond between nitrogen atoms and tosynthesize ammonia. Ammonia is the entry point ofdinitrogen in biological systems as it can be directlymetabolised into organic molecules or into nitrate vianitrification. Diazotrophs are therefore powerful engines ensuring a pool of biologically active nitrogen for microbial and eukaryotic life present in terrestrial [2] andaquatic systems