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. 2012 Oct 17;63(18):6335–6345. doi: 10.1093/jxb/ers285

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© 2012 The Authors.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 6. — Leaf physiological responses of Petunia as a function of midday leaf water potential (Ψ_leaf). Stomatal conductance (g_s, panel A), photosynthesis (A, panel B), and quantum yield of PSII (Ф_PSII, panel C) were measured by a leaf photosynthesis measurement system and midday leaf water potential (Ψ_leaf, panel D) was measured using thermocouple psychrometers. Substrate water content treatments: 0.40 (circles), 0.30 (diamonds); 0.20 (squares), and 0.10 m³·m^–3 (triangles). Closed symbols indicate data collected during the drying period and open symbols indicate data collected after substrate water content thresholds had been reached. P- and r-values indicate the results from Spearman’s rank order correlation performed on the combined data.