Figure 9.

Effects of reduced auxin transport. (A) Control simulation with the same parameters as Figure 7. (B) Simulation with a 60% reduction in active auxin transport. Note the widening of the vein. Red indicates PIN1 localization. (C) Simulation of strongly reduced active auxin transport. PIN1 (red) is expressed in inner tissues due to auxin diffusion from the L1 layer. Polarization is preferentially apical toward the L1. (D) Median longitudinal confocal section through a tomato grown on 10 μM NPA. AtPIN-GFP is shown in green. Note apical polarization (white arrows) toward the L1 layer in the inner tissue, as predicted by the model. Bar, 50 μm.