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@INPROCEEDINGS{vanDusschoten:892837,
      author       = {van Dusschoten, Dagmar and Muellers, Yannik},
      title        = {{O}bservation of root shrinkage and reduced root water
                      uptake},
      reportid     = {FZJ-2021-02376},
      year         = {2021},
      abstract     = {Observation of root shrinkage and reduced root water
                      uptakeDagmar van Dusschoten and Yannik MüllersIBG-2, Plant
                      Sciences, Forschungszentrum Jülich, Germany.The importance
                      of root-soil water contact was recognized in the 1970s and
                      ‘80s as a main factor in the efficiency of root water
                      uptake (RWU). Several studies indicated that roots shrink
                      when the soil becomes dry while even exhibiting a day-night
                      rhythm [1]. However, over the years the main focus had
                      shifted to the reduction of the soil water potential upon
                      drying and the accompanying reduction of the soil water
                      conductivity to explain reduced RWU upon soil drying. Also,
                      considerable efforts have been made to identify the
                      importance of aquaporins for root conductivity. Recently, it
                      was demonstrated in an indirect manner that root shrinkage
                      is indeed a main factor in water uptake efficiency [2].
                      Based on this we devised some experiments to investigate
                      this topic with two complementary, non-invasive technologies
                      which observe both root function and root structure.We
                      performed time series of root water uptake measurements on
                      three different plant species (Zea mays, Vicia faba and
                      Helianthus annuus) using the Soil Water Profiler (SWaP) [3]
                      while the plants were depleting available soil water,
                      yielding a soil water content gradient with most of the
                      water remaining at the bottom. Simultaneously, the profile
                      of RWU shifted to deeper soil layers as particularly the
                      upper soil layers became drier. After this series the root
                      system was scanned using Magnetic Resonance Imaging (MRI)
                      two times, once directly after the SWaP measurements and
                      once after re-watering. This combination of MRI measurements
                      showed that roots themselves had lost considerable amounts
                      of water during soil water depletion which was more
                      pronounced at the top than at the bottom. The uptake pattern
                      by the roots also showed that uptake is primarily reduced in
                      the root zones exhibiting the largest water loss. This
                      indicates a strong correlation between the two observations
                      and is a good indicator that root-soil contact is important.
                      Root diameter reduction clearly is an under-researched topic
                      which deserves more attention both from an experimental and
                      a modeling point of view. [1] M.G. Huck, B. Klepper and H.M.
                      Taylor, Plant Physiol. (1970), 45. [2] C.M.
                      Rodriguez‐Dominguez, T.J. Brodribb, New Phytol. (2020)
                      225. [3] D. van Dusschoten et. al, Plant Physiol (2020),
                      183.},
      month         = {May},
      date          = {2021-05-24},
      organization  = {The 11th Symposium of the
                       International Society of ROot Research
                       and Rooting 2021, Missouri (USA), 24
                       May 2021 - 28 May 2021},
      cin          = {IBG-2},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {217 - Für eine nachhaltige Bio-Ökonomie – von
                      Ressourcen zu Produkten (POF4-217)},
      pid          = {G:(DE-HGF)POF4-217},
      typ          = {PUB:(DE-HGF)1},
      url          = {https://juser.fz-juelich.de/record/892837},
}