Images of WT and lsh1/lsh2 nodule primordia at different developmental stages, first initial divisions (left), multilayered (middle), and emerged primordia (right) observed 7 days post spray inoculation with rhizobial bacteria expressing LacZ (blue stain). Black arrowheads indicate infection threads that are restricted in their progression into the inner root tissue layers. Squares relate to the legend in (B). Scale bars, 500 μm.
