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. 2016 Nov 18;68(2):321–333. doi: 10.1093/jxb/erw417

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© The Author 2016. Published by Oxford University Press on behalf of the Society for Experimental Biology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 1. — Net CO₂ assimilation rate (A; A, B), transpiration rate (E; C, D) and stomatal conductance to water vapour (g_s; E, F) in response to short-term variation of intercellular CO₂ (C_i) under low (N1, circles; A, C, E) or high N supply (N2, triangles; B, D, F) combined with low (V1, open symbols) or high VPD (V2, filled symbols). Data are shown as the mean±SE (n=9–10). Operating conditions of gas exchange measurements were the same as conditions in growth chambers (leaf temperature 25 °C, PPFD 800 μmol m⁻² s⁻¹, VPD 0.8 kPa for V1 and 1.6 kPa for V2). The corresponding C_i values at growth CO₂ concentration (390 μmol mol⁻¹) are indicated by grey (low VPD) and black arrows (high VPD) in (E) and (F).