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The oxygen isotope enrichment of leaf-exported assimilates – does it always reflect lamina leaf water enrichment?
The oxygen stable isotope composition of plant organic matter (OM) (particularly of wood and cellulose in the tree ring archive) is valuable in studies of plant–climate interaction, but there is a lack of information on the transfer of the isotope signal from the leaf to heterotrophic tissues. We st...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Blackwell Publishing Ltd
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3902987/ https://www.ncbi.nlm.nih.gov/pubmed/23763637 http://dx.doi.org/10.1111/nph.12359 |
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author | Gessler, Arthur Brandes, Elke Keitel, Claudia Boda, Sonja Kayler, Zachary E Granier, André Barbour, Margaret Farquhar, Graham D Treydte, Kerstin |
author_facet | Gessler, Arthur Brandes, Elke Keitel, Claudia Boda, Sonja Kayler, Zachary E Granier, André Barbour, Margaret Farquhar, Graham D Treydte, Kerstin |
author_sort | Gessler, Arthur |
collection | PubMed |
description | The oxygen stable isotope composition of plant organic matter (OM) (particularly of wood and cellulose in the tree ring archive) is valuable in studies of plant–climate interaction, but there is a lack of information on the transfer of the isotope signal from the leaf to heterotrophic tissues. We studied the oxygen isotopic composition and its enrichment above source water of leaf water over diel courses in five tree species covering a broad range of life forms. We tracked the transfer of the isotopic signal to leaf water-soluble OM and further to phloem-transported OM. Observed leaf water evaporative enrichment was consistent with values predicted from mechanistic models taking into account nonsteady-state conditions. While leaf water-soluble OM showed the expected (18)O enrichment in all species, phloem sugars were less enriched than expected from leaf water enrichment in Scots pine (Pinus sylvestris), European larch (Larix decidua) and Alpine ash (Eucalyptus delegatensis). Oxygen atom exchange with nonenriched water during phloem loading and transport, as well as a significant contribution of assimilates from bark photosynthesis, can explain these phloem (18)O enrichment patterns. Our results indicate species-specific uncoupling between the leaf water and the OM oxygen isotope signal, which is important for the interpretation of tree ring data. |
format | Online Article Text |
id | pubmed-3902987 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | Blackwell Publishing Ltd |
record_format | MEDLINE/PubMed |
spelling | pubmed-39029872014-01-29 The oxygen isotope enrichment of leaf-exported assimilates – does it always reflect lamina leaf water enrichment? Gessler, Arthur Brandes, Elke Keitel, Claudia Boda, Sonja Kayler, Zachary E Granier, André Barbour, Margaret Farquhar, Graham D Treydte, Kerstin New Phytol Research The oxygen stable isotope composition of plant organic matter (OM) (particularly of wood and cellulose in the tree ring archive) is valuable in studies of plant–climate interaction, but there is a lack of information on the transfer of the isotope signal from the leaf to heterotrophic tissues. We studied the oxygen isotopic composition and its enrichment above source water of leaf water over diel courses in five tree species covering a broad range of life forms. We tracked the transfer of the isotopic signal to leaf water-soluble OM and further to phloem-transported OM. Observed leaf water evaporative enrichment was consistent with values predicted from mechanistic models taking into account nonsteady-state conditions. While leaf water-soluble OM showed the expected (18)O enrichment in all species, phloem sugars were less enriched than expected from leaf water enrichment in Scots pine (Pinus sylvestris), European larch (Larix decidua) and Alpine ash (Eucalyptus delegatensis). Oxygen atom exchange with nonenriched water during phloem loading and transport, as well as a significant contribution of assimilates from bark photosynthesis, can explain these phloem (18)O enrichment patterns. Our results indicate species-specific uncoupling between the leaf water and the OM oxygen isotope signal, which is important for the interpretation of tree ring data. Blackwell Publishing Ltd 2013-10 2013-06-13 /pmc/articles/PMC3902987/ /pubmed/23763637 http://dx.doi.org/10.1111/nph.12359 Text en © 2013 The Authors New Phytologist © 2013 New Phytologist Trust http://creativecommons.org/licenses/by/3.0/ This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Gessler, Arthur Brandes, Elke Keitel, Claudia Boda, Sonja Kayler, Zachary E Granier, André Barbour, Margaret Farquhar, Graham D Treydte, Kerstin The oxygen isotope enrichment of leaf-exported assimilates – does it always reflect lamina leaf water enrichment? |
title | The oxygen isotope enrichment of leaf-exported assimilates – does it always reflect lamina leaf water enrichment? |
title_full | The oxygen isotope enrichment of leaf-exported assimilates – does it always reflect lamina leaf water enrichment? |
title_fullStr | The oxygen isotope enrichment of leaf-exported assimilates – does it always reflect lamina leaf water enrichment? |
title_full_unstemmed | The oxygen isotope enrichment of leaf-exported assimilates – does it always reflect lamina leaf water enrichment? |
title_short | The oxygen isotope enrichment of leaf-exported assimilates – does it always reflect lamina leaf water enrichment? |
title_sort | oxygen isotope enrichment of leaf-exported assimilates – does it always reflect lamina leaf water enrichment? |
topic | Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3902987/ https://www.ncbi.nlm.nih.gov/pubmed/23763637 http://dx.doi.org/10.1111/nph.12359 |
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