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Effects of leaf water evaporative 2H-enrichment and biosynthetic fractionation on leaf wax n-alkane δ2H values in C3 and C4 grasses
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 3676028
Author(s) Gamarra, Bruno; Sachse, D.; Kahmen, Ansgar
Author(s) at UniBasel Kahmen, Ansgar
Year 2016
Title Effects of leaf water evaporative 2H-enrichment and biosynthetic fractionation on leaf wax n-alkane δ2H values in C3 and C4 grasses
Journal Plant, Cell and Environment
Volume 39
Number 11
Pages / Article-Number 2390-2403
Abstract

Leaf wax n -alkane δ 2 H values carry important information about environmental and ecophysiological processes in plants. However, the physiological and biochemical drivers that shape leaf wax n -alkane δ 2 H values are not completely understood. It is particularly unclear why n -alkanes in grasses are typically 2 H-depleted compared with plants from other taxonomic groups such as dicotyledonous plants and why C3 grasses are 2 H-depleted compared with C4 grasses. To resolve these uncertainties, we quantified the effects of leaf water evaporative 2 H-enrichment and biosynthetic hydrogen isotope fractionation on n -alkane δ 2 H values for a range of C3 and C4 grasses grown in climate-controlled chambers. We found that only a fraction of leaf water evaporative 2 H-enrichment is imprinted on the leaf wax n -alkane δ 2 H values in grasses. This is interesting, as previous studies have shown in dicotyledonous plants a nearly complete transfer of this 2 H-enrichment to the n -alkane δ 2 H values. We thus infer that the typically observed 2 H-depletion of n -alkanes in grasses (as opposed to dicots) is because only a fraction of the leaf water evaporative 2 H-enrichment is imprinted on the δ 2 H values. Our experiments also show that differences in n -alkane δ 2 H values between C3 and C4 grasses are largely the result of systematic differences in biosynthetic fractionation between these two plant groups, which was on average −198Č and−159Č for C3 and C4 grasses, respectively.

Publisher Wiley
ISSN/ISBN 0140-7791 ; 1365-3040
edoc-URL http://edoc.unibas.ch/45179/
Full Text on edoc No
Digital Object Identifier DOI 10.1111/pce.12789
PubMed ID http://www.ncbi.nlm.nih.gov/pubmed/27392279
ISI-Number WOS:000385842400005
Document type (ISI) Article
 
   

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