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@ARTICLE{BacaCabrera:1025739,
      author       = {Baca Cabrera, Juan and Hirl, Regina T. and Schäufele, Rudi
                      and Zhu, Jianjun and Liu, Hai Tao and Gong, Xiao Ying and
                      Ogée, Jérôme and Schnyder, Hans},
      title        = {{H}alf of the 18{O} enrichment of leaf sucrose is conserved
                      in leaf cellulose of a {C} 3 grass across atmospheric
                      humidity and {CO}2 levels},
      journal      = {Plant, cell $\&$ environment},
      volume       = {47},
      number       = {6},
      issn         = {0140-7791},
      address      = {Oxford [u.a.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {FZJ-2024-03122},
      pages        = {2274-2287},
      year         = {2024},
      abstract     = {The 18O enrichment (Δ18O) of cellulose (Δ18OCel) is
                      recognized as a unique archive of past climate and plant
                      function. However, there is still uncertainty regarding the
                      proportion of oxygen in cellulose (pex) that exchanges
                      post-photosynthetically with medium water of cellulose
                      synthesis. Particularly, recent research with C3 grasses
                      demonstrated that the Δ18O of leaf sucrose (Δ18OSuc, the
                      parent substrate for cellulose synthesis) can be much higher
                      than predicted from daytime Δ18O of leaf water (Δ18OLW),
                      which could alter conclusions on photosynthetic versus
                      post-photosynthetic effects on Δ18OCel via pex. Here, we
                      assessed pex in leaves of perennial ryegrass (Lolium
                      perenne) grown at different atmospheric relative humidity
                      (RH) and CO2 levels, by determinations of Δ18OCel in
                      leaves, Δ18OLGDZW (the Δ18O of water in the leaf
                      growth-and-differentiation zone) and both Δ18OSuc and
                      Δ18OLW (adjusted for εbio, the biosynthetic fractionation
                      between water and carbohydrates) as alternative proxies for
                      the substrate for cellulose synthesis. Δ18OLGDZW was always
                      close to irrigation water, and pex was similar
                      (0.53 ± 0.02 SE) across environments when
                      determinations were based on Δ18OSuc. Conversely, pex was
                      erroneously and variably underestimated (range 0.02–0.44)
                      when based on Δ18OLW. The photosynthetic signal fraction in
                      Δ18OCel is much more constant than hitherto assumed,
                      encouraging leaf physiological reconstructions.},
      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       = {38488789},
      UT           = {WOS:001185548900001},
      doi          = {10.1111/pce.14881},
      url          = {https://juser.fz-juelich.de/record/1025739},
}