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Conductance of CO 2 across the mesophyll ( G  m ) frequently constrains photosynthesis ( P  N ) but cannot be measured directly. We examined G  m of cherry ( Prunus avium L . ) subjected to severe drought using the variable J method and carbon-isotopic composition ( δ  13 C) of sugars from the centre of the leaf, the leaf petiole sap, and sap from the largest branch. Depending upon the location of the plant from which sugars are sampled, G  m may be estimated over scales ranging from a portion of the leaf to a canopy of leaves. Both the variable J and δ  13 C of sugars methods showed a reduction in G  m as soil water availability declined. The δ  13 C of sugars further from the source of their synthesis within the leaf did not correspond as closely to the diffusive and C-isotopic discrimination conditions reflected in the instantaneous measurement of gas exchange and chlorophyll-fluorescence utilised by the variable J approach. Post-photosynthetic fractionation processes and/or the release of sugars from stored carbohydrates (previously fixed under different environmental and C-isotopic discrimination conditions) may reduce the efficacy of the δ  13 C of sugars from leaf petiole and branch sap in estimating G  m in a short-term study. Consideration should be given to the spatial and temporal scales at which G  m is under observation in any experimental analysis.

international journal of molecular sciences

A Comparison of the Variable J and Carbon-Isotopic Composition of Sugars Methods to Assess Mesophyll Conductance from the Leaf to the Canopy Scale in Drought-Stressed Cherry