Modelling the emergence of polarity patterns for the intercellular transport of auxin in plants

Silvia Grigolon 1 Peter Sollich 2 Olivier C. Martin 3

Journal of the Royal Society Interface, Royal Society, 2015, 12, pp.20141223

The hormone auxin is actively transported throughout plants via protein machineries including the dedicated transporter known as PIN. The associated transport is ordered with nearby cells driving auxin flux in similar directions. Here we provide a model of both the auxin transport and of the dynamics of cellular polarisation based on flux sensing. Our main findings are: (i) spontaneous intracellular PIN polarisation arises if PIN recycling dynamics are sufficiently non-linear, (ii) there is no need for an auxin concentration gradient, and (iii) ordered multi-cellular patterns of PIN polarisation are favored by molecular noise.

  • 1. LPTMS - Laboratoire de Physique Théorique et Modèles Statistiques
  • 2. King's College London
  • 3. GQE - Génétique Quantitative et Evolution (Génétique Végétale)