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. 2007 Oct 7;101(8):1255–1265. doi: 10.1093/aob/mcm235

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© The Author 2007. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

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Fig. 8. — Establishment of the ‘reverse fountain’ cycling of auxin: (A) initial conditions, (B) direction of flux towards the local maxima of auxin concentration; (C) redirection and canalization of the flux towards deeper tissues. The transport of auxin is mediated by carrier molecules distributed heterogeneously on cell walls: (D) AUX1 influx carrier conveys auxin to the L1 layer, (E) PIN1 efflux carrier directs the flux towards the site of maximum concentration in the L1 layer, (F) canalization process by PIN1 in deeper cells redirects the flux downwards (see Supplementary Information Video ‘Fountain’ available online).