Leaf scale quantification of the effect of photosynthetic gas exchange on Δ₄₇ of CO₂.

ABSTRACT: The clumped isotope composition (Δ₄₇, the anomaly of the mass 47 isotopologue relative to the abundance expected from a random isotope distribution) of CO₂ has been suggested as an additional tracer for gross CO₂ fluxes. However, the effect of photosynthetic gas exchange on Δ₄₇ has not been directly determined and two indirect/conceptual studies reported contradicting results. In this study, we quantify the effect of photosynthetic gas exchange on Δ₄₇ of CO₂ using leaf cuvette experiments with one C₄ and two C₃ plants. The experimental results are supported by calculations with a leaf cuvette model. Our results demonstrate the important roles of the Δ₄₇ value of CO₂ entering the le

SUBMITTER: Adnew GA 

PROVIDER: S-EPMC8263724 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature