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. 2024 Feb 7;25(4):2046. doi: 10.3390/ijms25042046

Figure 4.

Figure 4

Effect of NaCl on chlorophyll content, photosynthesis, and fluorescence in wild-type P. × canescens and PeGRP2-overexpressing lines. (A) Chlorophyll content. (B) Net photosynthetic rate (Pn). (C) Stomatal conductance (Gs). (D) The relative electron transport rate (ETR). (E) The actual photosynthetic quantum yield (YII). (F) The maximum photochemical efficiency of PSII (Fv/Fm). The PeGRP2-overexpressing lines (L-7 and L-8) and wild-type (WT) P. × canescens were treated with NaCl saline (0 or 100 mM) for 15 days. Chlorophyll content, chlorophyll fluorescence (maximum photochemical efficiency of PSII, Fv/Fm; actual photosynthetic quantum yield, YII; and relative electron transport rate, ETR), and leaf gas exchange (net photosynthetic rate, Pn, and stomatal conductance, Gs) were examined on day 0, day 10, and day 15 in control and salinized plants. Data are means ± SD (n = 3), and bars with different letters indicate significant differences (p < 0.05).