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  Intramolecular, compound-specific, and bulk carbon isotope patterns in C3 and C4 plants: a review and synthesis

Hobbie, E. A., & Werner, R. A. (2004). Intramolecular, compound-specific, and bulk carbon isotope patterns in C3 and C4 plants: a review and synthesis. New Phytologist, 161(2), 371-385. doi:10.1111/j.1469-8137.2004.00970.x.

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 Urheber:
Hobbie, E. A.1, Autor           
Werner, R. A.2, Autor           
Affiliations:
1Department Biogeochemical Systems, Prof. D. Schimel, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497754              
2Service Facility Stable Isotope/Gas Analytics, Dr. W. A. Brand, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497772              

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Schlagwörter: isotopic discrimination, C-3 plants, metabolic modeling, enzymes soil organic-matter; water-use efficiency; delta-c-13 values; c-13 contents; 6-phosphogluconate dehydrogenase; photosynthetic organisms; pyruvate decarboxylase; nicotiana-sylvestris; chemical-composition; dark respiration
 Zusammenfassung: Studies using carbon isotope differences between C-3 and C-4 photosynthesis to calculate terrestrial productivity or soil carbon turnover assume that intramolecular isotopic patterns and isotopic shifts between specific plant components are similar in C-3 and C-4 plants. To test these assumptions, we calculated isotopic differences in studies measuring components from C-3 or C-4 photosynthesis. Relative to source sugars in fermentation, C-3-derived ethanol had less C-13 and C-3-derived CO2 had more C-13 than C-4-derived ethanol and CO2. Both results agreed with intramolecular isotopic signatures in C-3 and C-4 glucose. Isotopic shifts between plant compounds (e.g. lignin and cellulose) or tissues (e.g. leaves and roots) also differed in C-3 and C-4 plants. Woody C-3 plants allocated more carbon to C-13-depleted compounds such as lignin or lipids than herbaceous C-3 or C-4 plants. This allocation influenced C-13 patterns among compounds and tissues. Photorespiration and isotopic fractionation at metabolic branch points, coupled to different allocation patterns during metabolism for C-3 vs C-4 plants, probably influence position-specific and compound-specific isotopic differences. Differing C-13 content of mobile and immobile compounds (e.g. sugars vs lignin) may then create isotopic differences among plant pools and along transport pathways. We conclude that a few basic mechanisms can explain intramolecular, compound-specific and bulk isotopic differences between C-3 and C-4 plants. Understanding these mechanisms will improve our ability to link bulk and compound-specific isotopic patterns to metabolic pathways in C-3 and C-4 plants.

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 Datum: 2004
 Publikationsstatus: Erschienen
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 Identifikatoren: ISI: ://000187550700006
Anderer: BGC0666
DOI: 10.1111/j.1469-8137.2004.00970.x
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Titel: New Phytologist
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: London : Academic Press.
Seiten: - Band / Heft: 161 (2) Artikelnummer: - Start- / Endseite: 371 - 385 Identifikator: CoNE: https://pure.mpg.de/cone/journals/resource/954925334695
ISSN: 0028-646X