Fig. 10.

Relative weighting of chemical and mechanical feedback on PIN localisation. Numerical solution of model (1)–(4a),(5) on a regular lattice of cells, starting from the same initial conditions as in Fig. 5a, but with cells undergoing auxin-dependent, horizontal growth, and with strain-dependent PIN localisation. a When chemical and mechanical PIN localisation are weighted equally, $\lambda =\nu =0.25$, four passage cells undergo small shifts and a total of 10 cells have altered PIN alignment, with one cell shifting from horizontal to vertical, and nine cells shifting from vertical to horizontal. b When chemical PIN localisation is dominated by mechanical PIN localisation, $\lambda =0.1$ and $\nu =0.4$, eight passage cells undergo small shifts and a total of 21 cells have altered PIN alignment, with three cells shifting from horizontal to vertical, and eighteen cells shifting from vertical to horizontal. All parameters are described in Appendix Tables 2 and 3. Cells are represented in the reference configuration (Color figure online)