Mitotic activity in the root and its simulation. a. The scheme of root tip structure in Arabidopsis. The cells of different types marked by different colors (for details, see figure 1). b. Qualitative profile of mitotic activity in cells along the central root axis. Two maxima of mitotic activity are distinguished along the central root axis according to Dolan et al. (1993)  and Beemster and Baskin (2000) . c. The model solution: auxin (red squares) and substance Y (blue circles) distributions regulate the rates of cell divisions in the root (gray columns). The dynamical characteristics (cell coordinates on the axis, auxin concentration, and division rates) in the model solutions reproduce root patterning, where the cells of different types are specifying around the distal auxin maximum. d. The plot of auxin-regulated Y degradation rate used in the model (Eq. (8)). (E) The plot of Y-regulated rates of cell division (first coefficient in Eq. (10)). QC is the quiescent center and RCI is the root cap initial.
Mironova et al. BMC Systems Biology 2010 4:98 doi:10.1186/1752-0509-4-98