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Auxin-driven patterning with unidirectional fluxes.

Mikolaj Cieslak1, Adam Runions1, Przemyslaw Prusinkiewicz2

  • 1Department of Computer Science, University of Calgary, 2500 University Dr. N.W., Calgary, AB T2N 1N4, Canada.

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Summary

Plant hormone auxin patterns plant structures by regulating its own transport. New models show biochemically plausible networks can create convergence points and canals through feedback mechanisms.

Keywords:
Petri netsauxin-driven patterningcanalizationconvergence point formationdual polarizationmodulated feedbackpolar auxin transportunidirectional flux.

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Area of Science:

  • Plant Biology
  • Developmental Biology
  • Computational Biology

Background:

  • The plant hormone auxin is crucial for plant structure development.
  • Previous computational models for auxin-driven patterning have faced challenges regarding their biochemical plausibility.
  • Understanding auxin transport regulation is key to deciphering plant morphogenesis.

Purpose of the Study:

  • To investigate the biochemical plausibility of auxin-driven plant patterning mechanisms.
  • To model how auxin transport regulation can lead to specific patterning outcomes like convergence points and canals.
  • To explore the role of intercellular auxin concentration in coordinating cellular responses.

Main Methods:

  • Application of unidirectional flux concepts and Petri net formalism.
  • Development of computational models simulating auxin transport and feedback loops.
  • Analysis of network dynamics under varying conditions of auxin efflux and influx.

Main Results:

  • Biochemically plausible networks capable of generating canalization and convergence patterns were identified.
  • Positive feedback of auxin efflux on PIN protein allocation, modulated by extracellular auxin, is a key network feature.
  • Antagonistic and synergistic interactions between auxin efflux and influx determine canal or convergence pattern formation.

Conclusions:

  • The study demonstrates plausible molecular mechanisms for auxin-mediated plant patterning.
  • Intercellular auxin concentration acts as the sole information signal for cell-to-cell communication in these models.
  • Dynamic switching between patterning modes is possible via minor changes in reaction rates, supporting theories of coordinated organ development.