Plant Development: Differential Growth Rates in Distinct Zones Shape an Ancient Plant Form  Lilan Hong, Adrienne H.K. Roeder  Current Biology  Volume 27, Issue 1, Pages R19-R21 (January 2017) DOI: 10.1016/j.cub.2016.11.028 Copyright © 2017 Elsevier Ltd Terms and Conditions

Figure 1 Shape determination by differential growth rate regions. In Marchantia polymorpha, Solly et al. show that the thallus shape is determined by isotropic growth, which varies regionally with distance from the nearby notches. Growth is inhibited in the notch. Arabidopsis sepals have similar growth rate regions, but growth is more anisotropic and follows a base-to-tip gradient. Different growth rates are represented as color gradients, with high growth rates in red and low in blue. The white axes show the principal directions of growth, with the length of the axes indicating the magnitude of the growth in that direction (i.e. the plus sign with equal axes represents isotropic growth, or equal growth in all directions). Current Biology 2017 27, R19-R21DOI: (10.1016/j.cub.2016.11.028) Copyright © 2017 Elsevier Ltd Terms and Conditions