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Published on December 8, 2006; 10.1104/pp.106.089284

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Received September 4, 2006
Accepted November 20, 2006

Spatial Variation of Deuterium Enrichment in Bulk Water of Eucalyptus Pauciflora Leaves

Jirí Santrucek *, Jirí Kveton , Jirí Setlík , and Lenka Bulícková

Institute of Plant Molecular Biology, AS CR, Branisovská 31, CZ-37005 Ceské Budejovice, Czech Republic; University of South Bohemia, Faculty of Biological Sciences, Branisovská 31, CZ - 370 05, Ceské Budejovice, Czech Republic
University of South Bohemia, Faculty of Biological Sciences, Branisovská 31, CZ - 370 05, Ceské Budejovice, Czech Republic

* Corresponding author; email: jsan{at}umbr.cas.cz.

Deuterium (D) enrichment of bulk water was measured and modeled in snowgum (Eucalyptus pauciflora) leaves grown under contrasting air and soil humidity in arid (A) and wet (W) conditions in a glasshouse. A map of the enrichment was constructed with a resolution of 4 mm by using a newly designed cryodistillation method. There was progressively increasing enrichment in both longitudinal (along the leaf midrib) and transversal (perpendicular to the midrib) directions, most pronounced in the A-grown leaf. The whole-leaf average of the enrichment was well below the value estimated by the Craig-Gordon model. The discrepancy between model and measurements persisted when the estimates were carried out separately for the leaf base and tip, which differed in temperature and stomatal conductance. The discrepancy was proportional to the transpiration rate, indicating the significance of diffusion - advection interplay (Péclet effect) of DHO molecules in small veins close to the evaporating sites in the leaf.Combined Craig-Gordon and ‘desert river’ models, with or without the Péclet number, P, were used for predicting the leaf longitudinal enrichment. The predictions without P overestimated the measured values of {delta}D. Fixed P value partially improved the coincidence. We suggest that P should vary along the leaf length l in order to reconcile the modeled data with observations of longitudinal enrichment. Local values of P, P(l), integrating the upstream fraction of water used or the leaf area, substantially improved the model predictions.




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