⊙e nif Ambient N. genes mmd Root 0N0N0 cell ---Electron transport. cofactor.and assembly genes Nucleus Root Nitrogenase NH NH, ATP ADP+P Nitrogen-fixing organelle Transport NH,and nitrogen compounds Plant primary to shoots Plant nitrogen compounds 、Nitrogen metabolism Toward nitrogen-fixing plants A concerted research effort could yield engineered plants that can directly fix nitrogen Toward nitrogen-fixing plants Science,2018 Toward nitrogen-fixing plants Science, 2018 自主固氮植物