Roots of the dmi1 mutant fail to become infected by rhizobia or mycorrhizal fungi. A, C. Roots inoculated with Sinorhizobium meliloti, showing the swollen root hair phenotype. B. Roots inoculated with Glomus versiforme, showing appresorium formation on the root surface.
Figures A and C courtesy of Doug Cook and Varma Penmetsa. Figure B from Maria Harrison.