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Oxygen isotope composition of phloem sap in relation to leaf water in Ricinus communis

Cernusak, Lucas; Wong, Suan Chin; Farquhar, Graham


We measured the oxygen isotope composition of both the water and dry matter components of phloem sap exported from photosynthesising Ricinus communis L. leaves. The 18O/16O composition of exported dry matter matched almost exactly that expected for equilibrium with average lamina leaf water (leaf water exclusive of water associated with primary veins) with an isotope effect of αo=1.027, where α o=Ro/Rw, and Ro and Rw are 18O/16O of organic molecules and water, respectively. Average lamina leaf...[Show more]

CollectionsANU Research Publications
Date published: 2003
Type: Journal article
Source: Functional Plant Biology
DOI: 10.1071/FP03137


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