Skip to main content
. Author manuscript; available in PMC: 2015 Feb 13.
Published in final edited form as: Nature. 2014 Aug 24;515(7525):125–129. doi: 10.1038/nature13663

Figure 4. Root zonation under normal growth and gravitropism.

Figure 4

a, Zonation dynamics in the PLT-spread model under normal growth conditions. Snapshots of the auxin distribution (Aux), PLT transcription (PLT), PLT protein (PLT), division rate (DivR, measured as number of divisions per cell per hour), cell expansion rate (ExpR, measured as growth (μm) per unit tissue (μm) per hour), differentiation level (Diff) and zonation dynamics (Zon) profiles. b, Root zonation dynamics in the gravitropism model under dynamic gravitropism. Left, snapshots of auxin, PLT transcription, PLT protein, expansion rate and zonation for leftward oriented gravity vector. (For downward and rightward oriented gravity vector see Extended Data Fig. 9a.) Right, dynamics of left–right differences in auxin, differentiation level and PLT protein distribution. Depicted are the used columella PIN orientation patterns, the applied 12 h cycle of PIN orientation changes, and the resulting auxin, differentiation level and PLT left–right distribution differences (see Supplementary Methods).‘t’ indicates the time point at which the snapshot was taken. c, DR5 and PLT expression in the same root (top) after gravitropic stimulation resulting in left–right difference in appearance of the first root hair (bottom). Arrows with ‘g’, gravity vector; white arrowheads, individual cells in the elongation zone; white arrows, youngest root hairs. Scale bar, 50 μm.