Fig. 1

Changes in chlorophyll fluorescence imaging and parameters under imazapyr acid stress. (A) Chlorophyll fluorescence parameter images. The leaves in the figure are the first fully expanded leaf (upper left position), the second fully expanded leaf (upper right position), the third fully expanded leaf (lower left position), and the fourth fully expanded leaf (lower right position). Imazapyr acid stress day 0 is used as control, data reported in the figure are means ± SD (n = 4). Each image in the same column represents the same leaf. The color scale at the top indicates values from 0 (black) to 1 (pink). (B-E) Changes of (B) Fv/Fm. (C) Y(II). (D) Y(NPQ). (E) Y(NO ) under imazapyr acid stress