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@ARTICLE{Gall:1049622,
      author       = {Gall, Samuel Le and van Dusschoten, Dagmar and Lattacher,
                      Adrian and Giraud, Mona and Harings, Moritz and Deseano
                      Diaz, Paulina Alejandra and Pflugfelder, Daniel and Alahmad,
                      Samir and Hickey, Lee and Sircan, Ahmet and Kandler, Ellen
                      and Lobet, Guillaume and Schnepf, Andrea and Pagel, Holger
                      and Poll, Christian and Vereecken, Harry and Javaux, Mathieu
                      and Rothfuss, Youri},
      title        = {{C}ombining spring wheat genotypes with contrasting root
                      architectures for a better use of water resources in soil?
                      {E}vidence from column-scale water stable isotopic
                      experiments.},
      journal      = {Plant and soil},
      reportid     = {FZJ-2025-05410},
      year         = {2025},
      abstract     = {Background and AimsThe advantages of genotype mixtures on
                      soil water balance are still poorly understood. We aim to
                      determine the impact of soil water conditions (well-watered
                      or chronic water deficit) on the root water uptake (RWU) of
                      two contrasting root genotypes (“shallow root system”
                      SRS and “deep root system” DRS) and their mixture at the
                      booting stage.MethodsWe conducted a controlled plant-soil
                      column experiment and quantified daily vertical profiles of
                      the fraction of RWU (fRWU, $\%$ cm-1), i.e. the relative
                      contribution of RWU normalized by the thickness of each
                      layer. This calculation was achieved by applying Bayesian
                      modelling on non-destructive soil and transpiration water
                      stable isotopic measurements after pulse labelling. We
                      compared these results to the monitored plant soil water
                      status, plant physiology and root
                      architectures.ResultsNotwithstanding minor variations in
                      root distribution, the SRS genotype exhibited a greater fRWU
                      compared to the SRS genotype in the topsoil (3.87±1.05 and
                      3.49±1.05 $\%$ cm-1, respectively) and vice-versa for the
                      subsoil (resp. 1.16±0.17 and 1.53±0.41 $\%$ cm-1). In
                      mixture, both genotypes maintained individual complementary
                      fRWU distribution. The soil water deficit conditions
                      resulted in an average increase in relative water uptake
                      from the subsoil $(+0.5\%$ cm-1) and topsoil $(+0.29\%$
                      cm-1) for both genotypes. In mixture facing water deficit,
                      the two genotypes in the mixture increased their
                      contributions to the subsoil by $0.5\%$ cm-1 and decreased
                      those to the topsoil by $-1.2\%$ cm-1 in comparison to a
                      monoculture.ConclusionThis study introduces novel
                      observations of root water uptake plasticity, which is
                      determined by genotype root architectures, soil water
                      availability, and interactions with neighboring plant root
                      architectures. This study highlights the potential of
                      contrasting root architectures mixtures to improve their
                      water - and nutrient – access facing water deficit.},
      cin          = {IBG-3},
      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)25},
      doi          = {https://doi.org/10.21203/rs.3.rs-7411150/v1},
      url          = {https://juser.fz-juelich.de/record/1049622},
}