title: Ammonia movements in rhizobia.
abstract: When free-living rhizobia are grown under N-excess conditions they appear to take up ammonia by a diffusive mechanism. Under low or limiting N, they derepress an ammonium permease which serves to scavenge NH4+. Current data suggest that N2-fixing bacteroids lose ammonia by a diffusive movement sustained by the continual removal of ammonia via the plant ammonia assimilatory system(s).
mesh_terms: D000641:Ammonia / Q000378:metabolism*; D026901:Membrane Transport Proteins / Q000737:chemistry*; D012230:Rhizobiaceae / Q000201:enzymology / Q000378:metabolism*
chemical_list: D026901:Membrane Transport Proteins; D000641:Ammonia