Metabolism is a major driver of hydrogen isotope fractionation recorded in tree-ring glucose of Pinus nigra.

ABSTRACT: 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 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 ≈ 

SUBMITTER: Wieloch T 

PROVIDER: S-EPMC9306475 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature