Figure 2.

(A) Auxin (left panel), PLETHORA (PLT) expression (middle panel), and PLT protein (right panel) levels in the epidermis over time (in hours post-germination) for a run with 0.1 influx. Final root layout shown on the right. (B) Auxin (left panel), PLT expression (middle panel), and PLT protein (right panel) levels in the epidermis over time for a run with 0.6 influx (the default level) Final root layout shown on the right. (See Supplementary Video S2 a more detailed timeseries of (A) and (B). (C) Meristem cell size trajectories for various shoot influx levels (thick lines). At several intervals (dotted lines) the influx levels were altered (thin lines). (D) Phase plane with nullclines for the Single-compartment model of Equations 1 and 2 with PLT nullcline in green and two auxin nullclines in red, one where shoot auxin influx is 0, and one where this influx is 9% of the roots maximum auxin production rate (0.01). Arrows indicate general direction of trajectories in that region of the phase plane. (E) Bifurcation diagram of the Single-compartment model for PLT level as a function of shoot auxin influx. Stable steady states depicted as continuous lines and instable steady state as a dashed line. Initial conditions converging to the high steady state are colored pink, and those converging to the lower stable steady state are colored green. (F) Phase plane with nullclines for the Single-compartment model of Equations 1 and 2 with PLT nullcline in green and three auxin nullclines in red, one where YUCCA-mediated auxin production is 20 times, one where it is 30 times and one where it is 50 times the basal auxin production rate. Arrows indicate general direction of trajectories in that region of the phase plane. (G) Bifurcation diagram of the Single-compartment model for PLT as a function of YUCCA-mediated auxin production levels.