MacKenzie, C R Ultrastructure of root nodules formed by ineffective strains of Rhizobium meliloti. [electronic resource] - Canadian journal of microbiology May 1974 - 755-8 p. digital Publication Type: Journal Article ISSN: 0008-4166 Standard No.: 10.1139/m74-115 doi Subjects--Topical Terms: Bacteroides--metabolismEndoplasmic Reticulum--metabolismMedicago sativa--drug effectsMicroscopy, ElectronMitochondria--metabolismMutationNitrogen--pharmacologyNitrogen FixationPlant CellsPlant DiseasesRhizobium--cytologyStarchSymbiosis