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. 2015 May 12;6:314. doi: 10.3389/fpls.2015.00314

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Copyright © 2015 Morari, Meggio, Lunardon, Scudiero, Forestan, Farinati and Varotto.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Stomatal conductance (g_s) in (A) P26 [y = −2.75 + (265.79 · x)/(1367.33 + x), R² = 0.91] and in (B) B73 [y = −0.89 + (220.5 · x)/(1312.94 + x), R² = 0.88] as a function of net CO₂ assimilation rate (A_n), or soil osmotic potential (Ψπ) in (C) P26 [y = 287.8 · −0.18/(−0.18 + x), R² = 0.54] and in (D) B73 [y = 299.73 ·− = 0.16/(-0.16 + x), R² = 0.37] in well-watered (C), water-stressed (WS) salt-stressed (SS) and their combination (WS+SS) plants of the two genotypes, P26 and B73. Each color corresponds to measurements at different time points (T0, 2, 4, 10, and 14). The curve of best fit for (A,B) and (C,D) plots was a single rectangular hyperbola and a hyperbola decay function, respectively. Three main regions are distinguished along the curves using g_s as a reference parameter: mild or no stress (Phase 1), moderate (Phase 2) or severe stress (Phase 3).