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Published on December 7, 2007; 10.1104/pp.107.105643

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Received July 19, 2007
Accepted November 18, 2007

Environmental effects on oxygen isotope enrichment of leaf water in cotton leaves

Francesco Ripullone *, Naoko Matsuo , Hilary Stuart-Williams , Suan Chin Wong , Marco Borghetti , Makoto Tani , and Graham Farquhar

Environmental Biology Group, Research School of Biological Sciences, Australian National University, Australia; Department of Crop Systems, Forestry and Environmental Sciences, University of Basilicata, Italy; Laboratory of Forest Hydrology, Graduate School of Agriculture, Kyoto University, Japan

* Corresponding author; email: francesco.ripullone{at}unibas.it.

The oxygen isotope enrichment of bulk leaf water ({Delta}b) was measured in cotton (Gossypium hirsutum L.) leaves in order to test the Craig-Gordon and Farquhar-Gan models under different environmental conditions. {Delta}b increased with increasing leaf-to-air vapor pressure difference (VPd) as an overall result of the responses to the ratio of ambient to intercellular vapour pressures (ea/ei) and to stomatal conductance (gs). The oxygen isotope enrichment of lamina water relative to source water ({Delta}-l), (which increased with increasing VPd) was estimated by mass balance between less enriched water in primary veins and enriched water in the leaf. The Craig-Gordon model overestimated {Delta}b (and {Delta}-l), as expected. Such discrepancies increased with increase in transpiration rate (E), supporting the Farquhar-Gan model, which gave reasonable predictions of {Delta}b and {Delta}-l with a scaled effective path length for the lamina (L) of 7.9 mm, much less than the total radial effective length Lr of 43 mm. The fitted values of L for {Delta}-l of individual leaves showed little dependence on VPd and temperature, supporting the assumption that the Farquhar-Gan formulation is relevant and useful in describing leaf water isotopic enrichment.




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