Berlin 2018 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 10: Postersession II

BP 10.34: Poster

Montag, 12. März 2018, 17:30–19:30, Poster C

Dynamic patterns of the plant growth regulator auxin — •João Ramos and Karen Alim — Max Planck Institute for Dynamics and Self-Organization

Auxin is a phytohormone whose patterns are responsible for plant morphogenesis and triggering cell fate decisions. Patterns of auxin concentration and flow change dynamically throughout plant development with the help of membrane bound efflux (PIN) and influx carriers (AUX/LAX). Nevertheless, the mechanisms behind auxin transport are still not fully understood, in particular, current models fall short on explaining fountain-like auxin flow patterns during lateral root formation. Recently, observations show that PIN localisation is influenced by mechanical stress/strain, which coupled with the auxin-induced local decrease of cell wall stiffness, has the potential to unlock our understanding of auxin transport phenomena. Moreover, experimental efforts in observing morphodynamics and auxin carriers during lateral formation were recently boosted with the advent of light sheet microscopy, in effect turning lateral root formation into a new prime model system for auxin transport. Here, we study a vertex model for cell wall mechanics, coupled with a compartment model of auxin transport from a cell to its immediate neighbours both passively and carrier mediated. More specifically, the effect of cell wall stress on PIN cycling, auxin-induced wall softening and AUX/LAX expression positive feedback on auxin levels, are taken into account. This model will later be coupled to a tissue growth model, in order to study how auxin patterns change dynamically during lateral root formation.