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. 2017 Jun 20;8:15885. doi: 10.1038/ncomms15885

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Copyright © 2017, The Author(s)

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Expected effects of energy spillover from PSII to PSI on PSI activity: physical contact between both PSs (a), disconnected PSs (b). (c) Fluorescence emission kinetics confirm full inhibition of PSII by DCMU and HA. (d) Kinetics of P₇₀₀ oxidation by light. (e) Kinetics of cyt oxidation by light. (f) Kinetics of oxidation of the entire pool of PSI electron donors by light. A cyt/PSI ratio of 3 was assumed based on the estimate shown in Supplementary Fig. 1. The light intensity was 800 μmol photons m⁻² s⁻¹. (c–f) Solid blue squares: control; empty red circles: 40 μM DCMU; green triangles: 40 μM DCMU+2 mM HA. Means±s.e.m. (n=6, from three biological samples). F₀: minimum fluorescence emission (active PSII). F_m: maximum fluorescence emission (inactive PSII). Closed box: actinic light off. Open box: actinic light on. DCMU and HA were added immediately before measurements.