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. 2013 Feb 1;64(6):1485–1496. doi: 10.1093/jxb/ert005

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© 2013 The Authors.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by-nc/3.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com.

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Fig. 2. — Assimilation rate (A), stomatal conductance (g_s), and intrinsic water-use efficiency (WUE_int) at instantaneous level in the young leaf (leaf 4) of an old (released in 1961) and a modern (released in 1997) winter wheat cultivar under varying levels of PPFD after they were exposed to elevated CO₂ and/or O₃ for 21 d in OTCs. Leaf chamber CO₂ concentration was maintained at 700 ppm. Control (CO₂, 385±4 ppm+CFA, 4±0.02 ppb O₃; open circles); elevated CO₂ (CO₂, 714±16 ppm+CFA, 4±0.02 ppb O₃; filled circles); O₃ (ambient CO₂, 385±4 ppm+elevated O₃, 72±5 ppb O₃ for 7h d^–1, 9.00–16.00h; open triangles); and elevated CO₂+O₃ (elevated CO₂, 714±16 ppm+elevated O₃, 72±5 ppb for 7h d^–1; filled triangles). Results are shown as means±1 standard error (n=6).