Figure 2.

Growth rates and the point of first root hair development in roots grown at 23°C (A and C) and 28°C (B and D) as a function of time. A and B, Final shape (solid line) and root tip pathway (dashed line) of roots grown at 23°C (A) and 28°C (B). Black circles indicate positions of the root tip at 10 h intervals starting at t = 0 h (arbitrary). Missing data reflect times when the root tip had grown outside the field of view. C and D, The root elongation rate (dc/dt, thick solid line), the distance from the root tip to first root hair development (d_h, thin solid line), and the distance from the root tip to where root ceases to significantly move (d_m, dotted line), for roots grown at 23°C (C) and 28°C (D). The vertical solid line in each panel indicates when the plate was shifted from θ = 90° to 45° (23°C, 7.9 h; 28°C, 6.9 h).