期刊
NEW PHYTOLOGIST
卷 234, 期 2, 页码 449-461出版社
WILEY
DOI: 10.1111/nph.18014
关键词
anaplerotic flux; Calvin-Benson cycle; change point; glucose-6-phosphate shunt; hydrogen stable isotopes; intramolecular isotope analysis; oxidative pentose phosphate pathway; sucrose-to-starch carbon partitioning
资金
- Swedish Research Council VR [2013-05219, 2018-04456]
- Knut and Alice Wallenberg Foundation [2015.0047]
- Kempe Foundations
- Vinnova [2013-05219, 2018-04456] Funding Source: Vinnova
- Swedish Research Council [2018-04456, 2013-05219] Funding Source: Swedish Research Council
Stable isotope abundances provide valuable information about plant physiological processes and environmental controls. By analyzing annual tree-ring series of Pinus nigra, we found that metabolic processes can affect hydrogen isotope abundances in glucose, and this effect is regulated by drought and atmospheric CO2 concentration. These findings enhance our understanding of how plant metabolism responds to environmental changes.
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 (1961-1995). We found fractionation signals (i.e. temporal variability in deuterium abundance) at glucose H-1 and H-2 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 approximate to 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.
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