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@ARTICLE{BacaCabrera:1009075,
      author       = {Baca Cabrera, Juan C. and Hirl, Regina T. and Zhu, Jianjun
                      and Schäufele, Rudi and Ogée, Jérôme and Schnyder, Hans},
      title        = {18 {O} enrichment of sucrose and photosynthetic and
                      nonphotosynthetic leaf water in a {C} 3 grass—atmospheric
                      drivers and physiological relations},
      journal      = {Plant, cell $\&$ environment},
      volume       = {46},
      number       = {9},
      issn         = {0140-7791},
      address      = {Oxford [u.a.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {FZJ-2023-02623},
      pages        = {2628-2648},
      year         = {2023},
      abstract     = {The 18O enrichment (Δ18O) of leaf water affects the Δ18O
                      of photosynthetic products such as sucrose, generating an
                      isotopic archive of plant function and past climate.
                      However, uncertainty remains as to whether leaf water
                      compartmentation between photosynthetic and
                      nonphotosynthetic tissue affects the relationship between
                      Δ18O of bulk leaf water (Δ18OLW) and leaf sucrose
                      (Δ18OSucrose). We grew Lolium perenne (a C3 grass) in
                      mesocosm-scale, replicated experiments with daytime relative
                      humidity $(50\%$ or $75\%)$ and CO2 level (200, 400 or
                      800 μmol mol−1) as factors, and determined Δ18OLW,
                      Δ18OSucrose and morphophysiological leaf parameters,
                      including transpiration (Eleaf), stomatal conductance (gs)
                      and mesophyll conductance to CO2 (gm). The Δ18O of
                      photosynthetic medium water (Δ18OSSW) was estimated from
                      Δ18OSucrose and the equilibrium fractionation between water
                      and carbonyl groups (εbio). Δ18OSSW was well predicted by
                      theoretical estimates of leaf water at the evaporative site
                      (Δ18Oe) with adjustments that correlated with gas exchange
                      parameters (gs or total conductance to CO2). Isotopic mass
                      balance and published work indicated that nonphotosynthetic
                      tissue water was a large fraction (~0.53) of bulk leaf
                      water. Δ18OLW was a poor proxy for Δ18OSucrose, mainly due
                      to opposite Δ18O responses of nonphotosynthetic tissue
                      water (Δ18Onon-SSW) relative to Δ18OSSW, driven by
                      atmospheric conditions.},
      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       = {37376738},
      UT           = {WOS:001017555500001},
      doi          = {10.1111/pce.14655},
      url          = {https://juser.fz-juelich.de/record/1009075},
}