Simulating the impact of (“long-distance” or “root-to-shoot”) hormonal signaling and non-uniform soil water distribution on plant transpiration

  • Katrin Huber Forschungszentrum Juelich GmbH
  • Jan Vanderborght Forschungszentrum Juelich GmbH
  • Mathieu Javaux Université Catholique de Louvain
  • Natalie Schroeder Forschungszentrum Juelich GmbH
  • Ian Dodd Lancaster University
  • Harry Vereecken Forschungszentrum Juelich GmbH
Keywords: R-SWMS, hormonal signaling, transpiration reduction, stomatal conductance


In response to non-uniformly distributed soil water, root water uptake and actual (whole plant) transpiration was simulated using R-SWMS as part of the soil dried. These variables varied widely (reduction between 10 and 55 percent) between plants with different controls of stomatal conductance, i.e. controlled by leaf water potential and/or by the concentration of a hormonal signal triggered by low root water potentials in dry soil regions. Hormonal regulation of transpiration was effective only for a limited time, when water flow out of drying soil regions was sufficient to transport hormones to the shoot.

Author Biographies

Katrin Huber, Forschungszentrum Juelich GmbH
Agrosphere (IBG-3)
Jan Vanderborght, Forschungszentrum Juelich GmbH
Agrosphere (IBG-3)
Mathieu Javaux, Université Catholique de Louvain
Life and Earth Institute
Natalie Schroeder, Forschungszentrum Juelich GmbH
Juelich Supercomputing Centre
Ian Dodd, Lancaster University
The Lancaster Environment Centre
Harry Vereecken, Forschungszentrum Juelich GmbH
Agrosphere (IBG-3)

2A Exchange and transport processes in plants