Optical sections of WT and lsh1/lsh2 roots 24 and 72 hpi with S. meliloti (n > 30 per genotype and time point); see also Figures S3B and S3C and Table S3. At 72 hpi, Sm2011-mCherry bacteria in red, cell walls in white (fluorescent brightener), and EdU-labeled nuclei indicating DNA replication in green. White arrowheads indicate periclinal cell divisions. Scale bars, 50 μm. See also Figure S6.