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. 2018 Oct 24;140(2):221–233. doi: 10.1007/s11120-018-0594-9

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 7 — Correlation of quantum efficiency of the photosystem II in the dark-adapted state (F_v/F_m) and the light-adapted state (F_q′/F_m′) obtained by fast repetition rate flash (FRRF_0.75ms) and multiple turnover flash (MTF_750ms) during a blue-light response curve of spinach leaves. Maximum fluorescence (F_m in the dark and F_m′ in the light) represents chlorophyll fluorescence yield of the averaged 300th and 301st flashlet of the FRRF_0.75ms respective the yield of the 7500th flashlet in case of the MTF_750ms. Variable fluorescence (F_v in the dark or F_q′ in the light) is the difference between F_m or F_m′ and the chlorophyll fluorescence yield of the first flashlet (F_o in the dark or F′ in the light). The regression formula was y = − 0.13 + 1.31 × x. Measurements were performed using the light-induced fluorescence transient (LIFT) device (n = 6 plants)