Figure 1.

Model for the action of POLARIS gene on the crosstalk of auxin, ethylene and cytokinin in Arabidopsis. Solid arrows indicate conversions, whereas dotted lines indicate regulations. Black dotted lines indicate regulation through auxin, ethylene or CTR1 receptors, whereas red dotted lines indicate these interactions, for which the molecular basis is unknown, but biological evidence shows their existence. There are a number of different possible ways to represent these interactions. For simplicity, we have included them without further expanding their interactions with the relevant receptors. The wide dotted line indicates regulations that are revealed by the discrepancy in auxin concentration in pls between modelling and experimental results (see Model predictions and experimental measurements section for details).