Consistent patterns in leaf lamina and leaf vein carbon isotope composition across ten herbs and tree species

2009 John Wiley & Sons, Ltd.

Bibliographic Details
Published in:Rapid communications in mass spectrometry : RCM, Vol. 23, No. 16 (2009), p. 2455-60
Main Author: Badeck, Franz-W
Other Involved Persons: Fontaine, Jean-Louis ; Dumas, Florian ; Ghashghaie, Jaleh
Format: electronic Article
Language:English
ISSN:1097-0231
Item Description:Date Completed 28.09.2009
Date Revised 27.07.2009
published: Print
Citation Status MEDLINE
Copyright: From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Physical Description:Online-Ressource
DOI:10.1002/rcm.4054
Subjects:
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520 |a Wide-spread post-photosynthetic fractionation processes deplete metabolites and plant compartments in (13)C relative to assimilates to varying degrees. Fragmentation fractionation and exchange of metabolites with distinct isotopic signatures across organ boundaries further modify the patterns of plant isotopic composition. Heterotrophic organs tend to become isotopically heavier than the putative source material as a result of respiratory metabolism. In addition fractionation may occur during metabolite transport across organ and tissue boundaries. Leaf laminae, veins and petioles are leaf compartments that are arranged along a gradient of increasing weight of heterotrophic processes and along a transport chain. Thus, we expect to find consistent patterns of isotopic signatures associated with this gradient. Earlier studies on leaves of Fagus sylvatica, Glycine max, and Saccharum officinarum showed that the organic mass and cellulose of major veins or petioles were consistently more positive than the respective fraction in leaf laminae. The objective of the current study was to assess whether this pattern can be detected in a greater set of plant species. Leaves from ten species were collected in the summer of 2006 outdoors and in glasshouses. Leaf laminae including small veins were separated from the major veins and the isotopic signatures of the organic mass, and the soluble and non-soluble fractions were measured for laminae and veins separately. The organic mass, and the soluble and non-soluble fractions of leaf laminae, were depleted in (13)C relative to the veins in all cases. A general trend for the signature of organic mass being more depleted in (13)C than the soluble fraction is in accordance with well-known patterns of fractionation between metabolites 
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