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@ARTICLE{Mllers:915954,
      author       = {Müllers, Yannik and Postma, Johannes A and Poorter,
                      Hendrik and van Dusschoten, Dagmar},
      title        = {{S}tomatal conductance tracks soil-to-leaf hydraulic
                      conductance in faba bean and maize during soil drying},
      journal      = {Plant physiology},
      volume       = {190},
      number       = {4},
      issn         = {0032-0889},
      address      = {Oxford},
      publisher    = {Oxford University Press},
      reportid     = {FZJ-2022-05811},
      pages        = {2279 - 2294},
      year         = {2022},
      abstract     = {Although regulation of stomatal conductance is widely
                      assumed to be the most important plant response to soil
                      drying, the picture is incomplete when hydraulic conductance
                      from soil to the leaf, upstream of the stomata, is not
                      considered. Here, we investigated to what extent soil drying
                      reduces the conductance between soil and leaf, whether this
                      reduction differs between species, how it affects stomatal
                      regulation, and where in the hydraulic pathway it occurs. To
                      this end, we noninvasively and continuously measured the
                      total root water uptake rate, soil water potential, leaf
                      water potential, and stomatal conductance of 4-week-old,
                      pot-grown maize (Zea mays) and faba bean (Vicia faba) plants
                      during 4 days of water restriction. In both species, the
                      soil–plant conductance, excluding stomatal conductance,
                      declined exponentially with soil drying and was reduced to
                      $50\%$ above a soil water potential of −0.1 MPa, which
                      is far from the permanent wilting point. This loss of
                      conductance has immediate consequences for leaf water
                      potential and the associated stomatal regulation. Both
                      stomatal conductance and soil–plant conductance declined
                      at a higher rate in faba bean than in maize. Estimations of
                      the water potential at the root surface and an incomplete
                      recovery 22 h after rewatering indicate that the loss of
                      conductance, at least partly, occurred inside the plants,
                      for example, through root suberization or altered aquaporin
                      gene expression. Our findings suggest that differences in
                      the stomatal sensitivity among plant species are partly
                      explained by the sensitivity of root hydraulic conductance
                      to soil drying.},
      cin          = {IBG-2},
      ddc          = {580},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {2171 - Biological and environmental resources for
                      sustainable use (POF4-217)},
      pid          = {G:(DE-HGF)POF4-2171},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {36099023},
      UT           = {WOS:000862628300001},
      doi          = {10.1093/plphys/kiac422},
      url          = {https://juser.fz-juelich.de/record/915954},
}