Hydrogen exchange during cellulose synthesis distinguishes climatic and biochemical isotope fractionations in tree rings.

Augusti, Angela (author): Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC)

Betson, Tatiana R (author): Umeå universitet,Institutionen för medicinsk kemi och biofysik

Schleucher, Jürgen (author): Umeå universitet,Institutionen för medicinsk kemi och biofysik

(creator_code:org_t)

2006-07-26
2006
English.
In: New Phytologist. - : Wiley. - 0028-646X .- 1469-8137. ; 172:3, s. 490-499

Related links:: https://nph.onlineli...; show more...; https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Abstract Subject headings

• The abundance of the hydrogen isotope deuterium (D) in tree rings is an attractive record of climate; however, use of this record has proved difficult so far, presumably because climatic and physiological influences on D abundance are difficult to distinguish.• Using D labelling, we created a D gradient in trees. Leaf soluble sugars of relatively low D abundance entered cellulose synthesis in stems containing strongly D-labelled water. We used nuclear magnetic resonance (NMR) spectroscopy to quantify D in the C-H groups of leaf glucose and of tree-ring cellulose.• Ratios of D abundances of individual C-H groups of leaf glucose depended only weakly on leaf D labelling, indicating that the D abundance pattern was determined by physiological influences. The D abundance pattern of tree-ring cellulose revealed C-H groups that exchanged strongly (C(2)-H) or weakly (C(6)-H2) with water during cellulose synthesis.• We propose that strongly exchanging C-H groups of tree-ring cellulose adopt a climate signal stemming from the D abundance of source water. C-H groups that exchange weakly retain their D abundance established in leaf glucose, which reflects physiological influences. Combining both types of groups may allow simultaneous reconstruction of climate and physiology from tree rings.

By the author/editor: Augusti, Angela; Betson, Tatiana ...; Schleucher, Jürg ...

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