Journal ArticleDOI
Theoretical considerations about carbon isotope distribution in glucose of C3 plants
TLDR
A modelling approach is taken in order to investigate the relationships between the intramolecular distribution of 13C in hexoses and the reactions of primary carbon metabolism, which takes into account C-C bond-breaking reactions of the Calvin cycle and leads to a mathematical expression for the isotope ratios in Hexoses in the steady state.Abstract:
The origin of the non-statistical intramolecular distribution of 13 C in glucose of C3 plants is examined, including the role of the aldolisation of triose phosphates as proposed by Gleixner and Schmidt (1997). A modelling approach is taken in order to investigate the relationships between the intramolecular distribution of 13 C in hexoses and the reactions of primary carbon metabolism. The model takes into account C-C bond-breaking reactions of the Calvin cycle and leads to a mathematical expression for the isotope ratios in hexoses in the steady state. In order to best fit the experimentally-observed intramolecular distribution, the values given by the model indicate that (i), the transketolase reaction fractionates against 13 C by 4-7‰ and (ii), depending on the photorespiration rate used for estimations, the aldolase reaction discriminates in favour of 13 C by 6‰ during fructose-1,6-bisphosphate production; an isotope discrimination by 2‰ against 13 C is obtained when the photorespiration rate is high. Additionally, the estimated fractionations are sensitive to the flux of starch synthesis. Fructose produced from starch breakdown is suggested to be isotopically heavier than sucrose produced in the light, and so the balance between these two sources affects the average intramolecular distribution of glucose derived from stored carbohydrates. The model is also used to estimate photorespiratory and day respiratory fractionations that appear to both depend only weakly on the rate of ribulose-1,5-bisphosphate oxygenation.read more
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Time lag between photosynthesis and carbon dioxide efflux from soil: a review of mechanisms and controls
Yakov Kuzyakov,Olga Gavrichkova +1 more
TL;DR: It is concluded that studies of CO2 fluxes from soil, especially in ecosystems with a high contribution of root-derived CO2, should consider photosynthesis as one of the main drivers of C fluxes, and calls for incorporating photosynthesis in soil C turnover models.
Journal ArticleDOI
Environmental and physiological determinants of carbon isotope discrimination in terrestrial plants
Lucas A. Cernusak,Nerea Ubierna,Klaus Winter,Joseph A. M. Holtum,Joseph A. M. Holtum,John D. Marshall,John D. Marshall,Graham D. Farquhar +7 more
TL;DR: The effective use of Δ across its full range of applications will require a holistic view of the interplay between environmental control and physiological modulation of the environmental signal.
Journal ArticleDOI
Stable isotopes in tree rings: towards a mechanistic understanding of isotope fractionation and mixing processes from the leaves to the wood.
Arthur Gessler,Juan Pedro Ferrio,Robert Hommel,Kerstin Treydte,Roland A. Werner,Russell K. Monson +5 more
TL;DR: This review starts from the rather well understood processes at the leaf level such as photosynthetic carbon isotope fractionation, leaf water evaporative isotope enrichment and the issue of the isotopic composition of inorganic sources (CO2 and H2O), though it focuses on the less explored 'downstream' processes related to metabolism and transport.
Journal ArticleDOI
Why are non-photosynthetic tissues generally 13C enriched compared with leaves in C3 plants? Review and synthesis of current hypotheses.
Lucas A. Cernusak,Guillaume Tcherkez,Claudia Keitel,William K. Cornwell,Louis S. Santiago,Alexander Knohl,Margaret M. Barbour,David G. Williams,Peter B. Reich,David S. Ellsworth,Todd E. Dawson,Howard Griffiths,Graham D. Farquhar,Ian J. Wright +13 more
TL;DR: Six hypotheses aimed at explaining this isotopic pattern in C3 plants are reviewed, with some evidence exists in support of hypotheses (3) through to (6), although for hypothesis (6) it is largely circumstantial.
Journal ArticleDOI
Carbon allocation and carbon isotope fluxes in the plant-soil-atmosphere continuum: a review
Nicolas Brüggemann,Arthur Gessler,Zachary Kayler,Sonjagisela Keel,Franz Badeck,Matti Barthel,Pascal Boeckx,Nina Buchmann,Enrico Brugnoli,Jürgen Esperschütz,Olga Gavrichkova,Jaleh Ghashghaie,Nuria Gomez-Casanovas,Claudia Keitel,Alexander Knohl,Alexander Knohl,Daniel Kuptz,Sara Palacio,Yann Salmon,Yoshitaka Uchida,Michael Bahn +20 more
TL;DR: In this paper, the authors provide an overview of an emerging picture of plant-soil-atmosphere C fluxes, as based on C isotope studies, and identify processes determining related related carbon isotope signatures.
References
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Journal ArticleDOI
On the Relationship Between Carbon Isotope Discrimination and the Intercellular Carbon Dioxide Concentration in Leaves
TL;DR: It is shown how diffusion of gaseous COz can significantly affect carbon isotopic discrimination and a simple relationship between discrimination and the ratio of the intercellular and atmospheric partial pressures of COZ is developed.
Journal ArticleDOI
Mechanism of carbon isotope fractionation associated with lipid synthesis
Michael J. DeNiro,Samuel Epstein +1 more
TL;DR: In vitro analysis of the kinetic isotope effects of this reaction indicates that there will be a large, temperature-dependent difference in the carbon-13/carbon-12 ratio between the methyl and carbonyl carbon atoms of acetyl coenzyme A and between thosecarbon atoms of lipid components which derive from them.
Book
Crop evolution, adaptation, and yield
TL;DR: Crop yields and world food supply, the domestication of crop plants, Adaptation and the ecology of yield, and the future of yield are reviewed.
Journal ArticleDOI
Intramolecular, compound‐specific, and bulk carbon isotope patterns in C3 and C4 plants: a review and synthesis
Erik A. Hobbie,Roland A. Werner +1 more
TL;DR: It is concluded that a few basic mechanisms can explain intramolecular, compound-specific and bulk isotopic differences between C3 and C4 plants.
Journal ArticleDOI
Subcellular Metabolite Levels in Spinach Leaves : Regulation of Sucrose Synthesis during Diurnal Alterations in Photosynthetic Partitioning.
TL;DR: The results provide direct evidence for the role of sucrose phosphate synthase and cytosolic fructose 1,6-bisphosphatase in regulating sucrose synthesis in leaves and also show that the phosphate translocator is kinetically limiting in vivo.