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. 2017 May 11;8:785. doi: 10.3389/fpls.2017.00785

FIGURE 6.

FIGURE 6

Effects of exogenous melatonin on net photosynthetic rate (Pn) (A), stomatal conductance (Gs) (B), intercellular CO2 (Ci) (C) and water use efficiency (WUE) (D) after 6-day cold stress (12°C). Others are the same as in Figure 1.