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PLANT PHYSIOLOGY , Vol 102, Issue 4 1287-1290, Copyright © 1993 by American Society of Plant Biologists
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METABOLISM AND ENZYMOLOGY |
Correlations between the 13C Content of Primary and Secondary Plant Products in Different Cell Compartments and That in Decomposing Basidiomycetes
G. Gleixner, H. J. Danier, R. A. Werner and H. L. Schmidt
Lehrstuhl fur Allgemeine Chemie und Biochemie, Technische Universitat Munchen, D-8050 Freising, Germany
Relative carbon isotope ratio ([delta]13C values) of primary and secondary
products from different compartments of annual plants, pine needles, wood,
and decomposing Basidiomycetes have been determined. An enrichment in 13C
was found for storage tissues of annual plants, because of the high level
of the primary storage products sucrose and starch; however, the enrichment
was even greater in leaf starch. All of these compounds had the same
relative 13C enrichment in positions 3 and 4 of glucose. Secondary products
in conifer needles (lignin, lipids) were depleted in 13C by 1 to 2 [per
mille (thousand) sign] relative to carbohydrates from the same origin. Air
pollution caused a small decrease in [delta]13C values; however, the
relative content of plant products, especially of the soluble polar
compounds, was also affected. Decomposing fungi showed a global
accumulation of 13C by 4[per mille (thousand) sign] relative to their
substrates in wood. Their chitin was enriched by 2[per mille (thousand)
sign] relative to the cellulose of the wood. Hence, Basidiomycetes
preferentially metabolize "light" molecules, whereas "heavy" molecules are
preferentially polymerized. Our results are discussed on the basis of a
kinetic isotope effect on the fructose-1,6-bisphosphate aldolase reaction
and of metabolic branching on the level of the triose phosphates with
varying substrate fluxes.
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