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Net photosynthetic assimilation (A), H2O transpiration (B), photosynthetic 18O/16O isotope fractionation (C; Δ18O, black bars), and 18O/16O isotope composition of transpired water (C; δ18O, white bars) of detached X. strumarium leaves, as photosynthesis operates in H2O or D2O under 400 μmol mol−1 CO2, 21% O2, 400 μmol m−2 s−1 photosynthetically active radiation, and 21°C. Dashed lines stand for the δ18O value of source water (H2O, bottom dashed line; D2O, top dashed line).
