Fig. 2: Growth inhibition of xip mutant and its sensitivity to genotoxic stress.

a 12-day-old WT and xip mutant germinated and grown on MS medium with or without genotoxin (1 mM HU or 2.5 μM BLM). Bar = 10 mm. b Differential interference contrast (DIC) images taken on roots at 6 days after germination (DAG). The grey lines were added to facilitate the comparison of meristems, in which cells did not enlarge or elongate as revealed by DIC. Representative image from 20 root tips was shown. Bar = 50 μm. c Comparison of the primary root elongation in WT germinated and vertically grown on MS medium with or without genotoxin (1 mM HU or 2.5 μM BLM). Mean values of WT root length were shown together with error bars indicating ±SD from 30 biologically independent plants. Asterisks indicated the statistically significant differences between the MS medium and genotoxin treatment (p < 0.05, t-test, two-tail). All the p values can be found in the source data. d Comparison of the primary root elongation in xip mutant (left panel) or XIP in xip (right panel) with WT (shown as percentages) germinated and vertically grown on either MS medium or medium containing 1 mM HU or 2.5 μM BLM. Mean values of the relative root length (percentages) were shown together with error bars indicating ±SD from 30 biologically independent plants. Asterisks indicated the statistically significant differences between the MS medium and genotoxin treatment (p < 0.05, t-test, two-tail). All the p values can be found in the source data.