Figure 1.

Longitudinal and radial strain rates as a function of distance from the apex for well-watered (ww, 24 and 48 h after transplanting) and water-stressed (ws, 48 h after transplanting) roots. The data are from Liang et al. (1997). A, Longitudinal strain rate. Arrows indicate positions where microtubule orientation changed from transverse to oblique (Fig. 3). B, Radial strain rate for the cortex. C, Growth anisotropy, calculated as the ratio of longitudinal to radial strain rates. Note that when radial strain rates are near 0 growth anisotropy tends toward infinity; these values are not plotted.