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. 2013 Jan 28;8(1):e54802. doi: 10.1371/journal.pone.0054802

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© 2013 Walker et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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In all three cases the sink is an auxin maximum. PIN is ubiquitous and oriented towards the sink (central cell). (A) This simulation has a linear feedback function ( = 1.0) and the polar-out requirement is not obeyed. (B) This simulation has feedback exponent = 1.1. Here the polar-out requirement is obeyed, except where the PIN cut-off is met. (C) This is the same as (B) except that the PIN concentration cap has been halved to 5 µmol µm⁻ ². The build-up of auxin around the sink (centre) is larger in extent and the polar-out requirement is violated more often due to PIN saturation occuring at lower PIN concentrations.

Inline graphic — In all three cases the sink is an auxin maximum. PIN is ubiquitous and oriented towards the sink (central cell). (A) This simulation has a linear feedback function ( = 1.0) and the polar-out requirement is not obeyed. (B) This simulation has feedback exponent = 1.1. Here the polar-out requirement is obeyed, except where the PIN cut-off is met. (C) This is the same as (B) except that the PIN concentration cap has been halved to 5 µmol µm⁻ ². The build-up of auxin around the sink (centre) is larger in extent and the polar-out requirement is violated more often due to PIN saturation occuring at lower PIN concentrations.