Metabolism is a major driver of hydrogen isotope fractionation recorded in tree‐ring glucose of Pinus nigra
| Autor: | Thomas Wieloch, Henrik Serk, Ina Ehlers, Jun Yu, Angela Augusti, Michael Grabner, Jürgen Schleucher |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Physiology
oxidative pentose phosphate pathway chemistry.chemical_element Calvin–Benson cycle Fractionation Plant Science Oxygen Isotopes Trees Dendrochronology glucose-6-phosphate shunt hydrogen stable isotopes sucrose-tostarch carbon partitioning Carbon Isotopes Stable isotope ratio Chemistry Calvin-Benson cycle Hydrogen isotope fungi Botany food and beverages Metabolism Botanik Pinus Pinus Glucose Deuterium anaplerotic flux Environmental chemistry sucrose-to-starch carbon partitioning change point Carbon intramolecular isotope analysis Hydrogen |
| Zdroj: | New phytologist 234 (2022): 449–461. doi:10.1111/nph.18014 info:cnr-pdr/source/autori:Wieloch, Thomas; Grabner, Michael; Augusti, Angela; Serk, Henrik; Ehlers, Ina; Yu, Jun; Schleucher, Jurgen/titolo:Metabolism is a major driver of hydrogen isotope fractionation recorded in tree-ring glucose of Pinus nigra/doi:10.1111%2Fnph.18014/rivista:New phytologist (Print)/anno:2022/pagina_da:449/pagina_a:461/intervallo_pagine:449–461/volume:234 |
| Popis: | Summary–Stable isotope abundances convey valuable information about plant physiological processes and underlying environmental controls. Central gaps in our mechanistic understanding of hydrogen isotope abundances impede their widespread application within the plant and biogeosciences.–To address these gaps, we analysed intramolecular deuterium abundances in glucose of Pinus nigra extracted from an annually resolved tree-ring series (1961 to 1995).–We found fractionation signals (i.e., temporal variability in deuterium abundance) at glucose H1 and H2 introduced by closely related metabolic processes. Regression analysis indicates that these signals (and thus metabolism) respond to drought and atmospheric CO2 concentration beyond a response change point. They explain ≈60% of the whole-molecule deuterium variability. Altered metabolism is associated with below-average yet not exceptionally low growth.–We propose the signals are introduced at the leaf-level by changes in sucrose-to-starch carbon partitioning and anaplerotic carbon flux into the Calvin-Benson cycle. In conclusion, metabolism can be the main driver of hydrogen isotope variation in plant glucose. |
| Databáze: | OpenAIRE |
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