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Recent methodological advancements in sugar infusion allow for a better understanding of physiological processes alleviating root C limitation.<\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>\n                          We conducted a glasshouse experiment with maple (\n                          <jats:italic>Acer pseudoplatanus<\/jats:italic>\n                          L.) and pine (\n                          <jats:italic>Pinus sylvestris<\/jats:italic>\n                          L.) saplings that underwent defoliation followed by either slow, fast, or no\n                          <jats:sup>13<\/jats:sup>\n                          C\u2010labeled glucose infusion. We measured photosynthetic parameters, nonstructural carbohydrate (NSC) concentrations, and \u03b4\n                          <jats:sup>13<\/jats:sup>\n                          C in cellulose of leaves, twigs, and fine roots, as well as the isotopic composition of dark\u2010respired CO\n                          <jats:sub>2<\/jats:sub>\n                          .\n                        <\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>Sugar infusion induced photosynthetic downregulation and leaf senescence in maple but not in pine. Leaf photosynthesis was negatively correlated with leaf NSC concentration in maple. These responses exacerbated root C limitation in maple. Conversely, pine maintained stable photosynthetic rates and needle NSC concentrations across treatments, showing the potential of sugar infusion to mitigate root C limitation.<\/jats:p>\n                      <\/jats:list-item>\n                      <jats:list-item>\n                        <jats:p>Our study suggests that exogenous sugar supply reduces the root C availability when it impairs a plant's photosynthetic performance. Species\u2010specific differences influence infused sugar transport and overall source\u2013sink responses. Alleviating C limitation in roots via exogenous sugar addition is feasible only if photosynthesis is not impeded.<\/jats:p>\n                      <\/jats:list-item>\n                    <\/jats:list>\n                  <\/jats:p>","DOI":"10.1111\/nph.70231","type":"journal-article","created":{"date-parts":[[2025,5,22]],"date-time":"2025-05-22T02:09:09Z","timestamp":1747879749000},"page":"577-594","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Exogenous sugar addition can exacerbate root carbon limitation in trees"],"prefix":"10.1111","volume":"247","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1738-4672","authenticated-orcid":false,"given":"Yan\u2010Li","family":"Zhang","sequence":"first","affiliation":[{"name":"Forest Dynamics Swiss Federal Institute for Forest, Snow and Landscape Research WSL  CH\u20108903 Birmensdorf Switzerland"},{"name":"Department of Environmental Systems Science Institute of Terrestrial Ecosystems, ETH Z\u00fcrich  CH\u20108092 Z\u00fcrich Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1910-9589","authenticated-orcid":false,"given":"Arthur","family":"Gessler","sequence":"additional","affiliation":[{"name":"Forest Dynamics Swiss Federal Institute for Forest, Snow and Landscape Research WSL  CH\u20108903 Birmensdorf Switzerland"},{"name":"Department of Environmental Systems Science Institute of Terrestrial Ecosystems, ETH Z\u00fcrich  CH\u20108092 Z\u00fcrich Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2962-3351","authenticated-orcid":false,"given":"Marco M.","family":"Lehmann","sequence":"additional","affiliation":[{"name":"Forest Dynamics Swiss Federal Institute for Forest, Snow and Landscape Research WSL  CH\u20108903 Birmensdorf Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0158-8892","authenticated-orcid":false,"given":"Marcus","family":"Schaub","sequence":"additional","affiliation":[{"name":"Forest Dynamics Swiss Federal Institute for Forest, Snow and Landscape Research WSL  CH\u20108903 Birmensdorf Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3954-3534","authenticated-orcid":false,"given":"Matthias","family":"Saurer","sequence":"additional","affiliation":[{"name":"Forest Dynamics Swiss Federal Institute for Forest, Snow and Landscape Research WSL  CH\u20108903 Birmensdorf Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1944-4042","authenticated-orcid":false,"given":"Andreas","family":"Rigling","sequence":"additional","affiliation":[{"name":"Forest Dynamics Swiss Federal Institute for Forest, Snow and Landscape Research WSL  CH\u20108903 Birmensdorf Switzerland"},{"name":"Department of Environmental Systems Science Institute of Terrestrial Ecosystems, ETH Z\u00fcrich  CH\u20108092 Z\u00fcrich Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7029-2841","authenticated-orcid":false,"given":"Mai\u2010He","family":"Li","sequence":"additional","affiliation":[{"name":"Forest Dynamics Swiss Federal Institute for Forest, Snow and Landscape Research WSL  CH\u20108903 Birmensdorf Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,5,21]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1315179111"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.foreco.2009.09.001"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/nph.13477"},{"key":"e_1_2_9_5_1","unstructured":"AphaloPJ.2021.ggpmisc: Miscellaneous Extensions to \u2018ggplot2\u2019. 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