Umeå universitets logga

Metabolism is a major driver of hydrogen isotope fractionation recorded in tree‐ring glucose of Pinus nigra 2022 (Engelska)Ingår i: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 234, nr 2, s. 449-461Artikel i tidskrift (Refereegranskat) Published

Abstract [en]

• 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 ≈ 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.

Ort, förlag, år, upplaga, sidor

John Wiley & Sons, 2022. Vol. 234, nr 2, s. 449-461

Nyckelord [en]

anaplerotic flux, Calvin–Benson cycle, change point, glucose-6-phosphate shunt, hydrogen stable isotopes, intramolecular isotope analysis, oxidative pentose phosphate pathway, sucrose-tostarch carbon partitioning

Nationell ämneskategori

Botanik

Identifikatorer

URN: urn:nbn:se:umu:diva-192853DOI: 10.1111/nph.18014ISI: 000761272500001PubMedID: 35114006Scopus ID: 2-s2.0-85124350850OAI: oai:DiVA.org:umu-192853DiVA, id: diva2:1641563

Forskningsfinansiär

Vetenskapsrådet, 2013‐05219Vetenskapsrådet, 2018‐04456Knut och Alice Wallenbergs Stiftelse, 2015.0047KempestiftelsernaTillgänglig från: 2022-03-02 Skapad: 2022-03-02 Senast uppdaterad: 2022-05-19Bibliografiskt granskad

Open Access i DiVA

Övriga länkar

Förlagets fulltextPubMedScopus

Person

Wieloch, ThomasSerk, HenrikEhlers, InaYu, JunSchleucher, Jürgen

Sök vidare i DiVA

Av författaren/redaktören

Wieloch, ThomasGrabner, MichaelAugusti, AngelaSerk, HenrikEhlers, InaYu, JunSchleucher, Jürgen

Av organisationen

Institutionen för medicinsk kemi och biofysikInstitutionen för matematik och matematisk statistik

I samma tidskrift

New Phytologist

I ämnet

Botanik

Sök vidare utanför DiVA

GoogleGoogle ScholarTotalt: 167 nedladdningarTotalt: 392 träffar