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Leaf wax n-alkane δD values are determined early in the ontogeny of Populus trichocarpa leaves when grown under controlled environmental conditions

Kahmen, Ansgar and Dawson, Todd E. and Vieth, Andrea and Sachse, Dirk. (2011) Leaf wax n-alkane δD values are determined early in the ontogeny of Populus trichocarpa leaves when grown under controlled environmental conditions. Plant, Cell and Environment, 34 (10). pp. 1639-1651.

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Official URL: http://edoc.unibas.ch/49358/

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Abstract

The stable hydrogen isotope ratios (δD) of leaf wax n-alkanes record valuable information on plant and ecosystem water relations. It remains, however, unknown if leaf wax n-alkane δD values record only environmental variation during the brief period of time of leaf growth or if leaf wax n-alkane δD values are affected by environmental variability throughout the entire lifespan of a leaf. To resolve these uncertainties, we irrigated Populus trichocarpa trees with a pulse of deuterium-enriched water and used compound-specific stable hydrogen isotope analyses to test if the applied tracer could be recovered from leaf wax n-alkanes of leaves that were at different stages of their development during the tracer application. Our experiment revealed that only leaf wax n-alkanes from leaves that had developed during the time of the tracer application were affected, while leaves that were already fully matured at the time of the tracer application were not. We conclude from our study that under controlled environmental conditions, leaf wax n-alkanes are synthesized only early in the ontogeny of a leaf. Our experiment has implications for the interpretation of leaf wax n-alkane δD values in an environmental context, as it suggests that these compounds record only a brief period of the environmental variability that a leaf experiences throughout its life.
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
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Last Modified:30 Nov 2017 09:38
Deposited On:30 Nov 2017 09:38

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