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Intramolecular carbon isotope signals reflect metabolite allocation in plants

Journal Article · · Journal of Experimental Botany
DOI:https://doi.org/10.1093/jxb/erac028· OSTI ID:1863466
 [1];  [2];  [3];  [1];  [4]
  1. Department of Medical Biochemistry and Biophysics, Umeå University, 901 87 Umeå, Sweden
  2. MSU-DOE Plant Research Laboratory, Plant Resilience Institute, and Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824, USA
  3. Department of Environmental Systems Science, ETH Zürich, Universitätstrasse 2, 8092 Zürich, Switzerland
  4. Brookhaven National Laboratory, USA
Abstract

Stable isotopes at natural abundance are key tools to study physiological processes occurring outside the temporal scope of manipulation and monitoring experiments. Whole-molecule carbon isotope ratios (13C/12C) enable assessments of plant carbon uptake yet conceal information about carbon allocation. Here, we identify an intramolecular 13C/12C signal at tree-ring glucose C-5 and C-6 and develop experimentally testable theories on its origin. More specifically, we assess the potential of processes within C3 metabolism for signal introduction based (inter alia) on constraints on signal propagation posed by metabolic networks. We propose that the intramolecular signal reports carbon allocation into major metabolic pathways in actively photosynthesizing leaf cells including the anaplerotic, shikimate, and non-mevalonate pathway. We support our theoretical framework by linking it to previously reported whole-molecule 13C/12C increases in cellulose of ozone-treated Betula pendula and a highly significant relationship between the intramolecular signal and tropospheric ozone concentration. Our theory postulates a pronounced preference for leaf cytosolic triose-phosphate isomerase to catalyse the forward reaction in vivo (dihydroxyacetone phosphate to glyceraldehyde 3-phosphate). In conclusion, intramolecular 13C/12C analysis resolves information about carbon uptake and allocation enabling more comprehensive assessments of carbon metabolism than whole-molecule 13C/12C analysis.

Research Organization:
Michigan State University, East Lansing, MI (United States)
Sponsoring Organization:
Kempe Foundations; Knut and Alice Wallenberg Foundation; Michigan AgBioResearch; Swedish Research Council; USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
FG02-91ER20021
OSTI ID:
1863466
Alternate ID(s):
OSTI ID: 1854034
OSTI ID: 1979502
Journal Information:
Journal of Experimental Botany, Journal Name: Journal of Experimental Botany Journal Issue: 8 Vol. 73; ISSN 0022-0957
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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