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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

Gamarra, Bruno and Sachse, D. and Kahmen, Ansgar. (2016) Effects of leaf water evaporative 2H-enrichment and biosynthetic fractionation on leaf wax n-alkane δ2H values in C3 and C4 grasses. Plant, Cell and Environment, 39 (11). pp. 2390-2403.

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Official URL: http://edoc.unibas.ch/45179/

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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 −198‰ and−159‰ for C3 and C4 grasses, respectively.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Botanik > Physiological Plant Ecology (Kahmen)
UniBasel Contributors:Kahmen, Ansgar
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Wiley
ISSN:0140-7791
e-ISSN:1365-3040
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:30 Oct 2017 07:33
Deposited On:30 Oct 2017 07:33

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