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. 2017 Mar 6;68(7):1757–1767. doi: 10.1093/jxb/erx052

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© The Author 2017. 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. — Stomatal conductance (g_s) of poplar (left panels) and loblolly pine (right panels) and its dependence on T_l and VPD. Plants were measured in high soil moisture conditions and (a, d) ambient [CO₂] or (b, e) elevated [CO₂]. (c, f) Measurements made on drought-stressed trees at ambient [CO₂]. Linear regression was used to fit the data for poplar and non-linear regression was used for loblolly pine. Asterisks at the z-axis label indicate overall significance of the model; asterisks at the x-and y-axes indicate significance of the respective parameters (*P < 0.05; **P < 0.01; ***P < 0.001).