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@ARTICLE{Abdalla:904443,
      author       = {Abdalla, Mohanned and Carminati, Andrea and Cai, Gaochao
                      and Javaux, Mathieu and Ahmed, Mutez Ali},
      title        = {{S}tomatal closure of tomato under drought is driven by an
                      increase in soil–root hydraulic resistance},
      journal      = {Plant, cell $\&$ environment},
      volume       = {44},
      number       = {2},
      issn         = {0140-7791},
      address      = {Oxford [u.a.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {FZJ-2021-06013},
      pages        = {425 - 431},
      year         = {2021},
      abstract     = {The fundamental question as to what triggers stomatal
                      closure during soil drying remains contentious. Thus, we
                      urgently need to improve our understanding of stomatal
                      response to water deficits in soil and atmosphere. Here, we
                      investigated the role of soil–plant hydraulic conductance
                      (Ksp) on transpiration (E) and stomatal regulation. We used
                      a root pressure chamber to measure the relation between E,
                      leaf xylem water potential (ψleaf-x) and soil water
                      potential (ψsoil) in tomato. Additional measurements of
                      ψleaf-x were performed with unpressurized plants. A
                      soil–plant hydraulic model was used to simulate
                      E(ψleaf-x) for decreasing ψsoil. In wet soils, E(ψleaf-x)
                      had a constant slope, while in dry soils, the slope
                      decreased, with ψleaf-x rapidly and nonlinearly decreasing
                      for moderate increases in E. The ψleaf-x measured in
                      pressurized and unpressurized plants matched well, which
                      indicates that the shoot hydraulic conductance did not
                      decrease during soil drying and that the decrease in Ksp is
                      caused by a decrease in soil–root conductance. The
                      decrease of E matched well the onset of hydraulic
                      nonlinearity. Our findings demonstrate that stomatal closure
                      prevents the drop in ψleaf-x caused by a decrease in Ksp
                      and elucidate a strong correlation between stomatal
                      regulation and belowground hydraulic limitation.},
      cin          = {IBG-3},
      ddc          = {580},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217)},
      pid          = {G:(DE-HGF)POF4-2173},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:33150971},
      UT           = {WOS:000589761200001},
      doi          = {10.1111/pce.13939},
      url          = {https://juser.fz-juelich.de/record/904443},
}