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. 2019 Jun 5;8(6):152. doi: 10.3390/plants8060152

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Hypothetical pathway of the AEF-I. Photo-excited P700 (P700*) donates an electron to the first electron carrier, A₀, to produce P700⁺. Subsequently, P700⁺ accepts an electron from PC in PSII to regenerate P700. A₀ donates the electron to the second electron carrier, A₁. Thereafter, the electron flows to ferredoxin (Fd) through the third and fourth electron carriers, F_x and F_A/F_B, respectively. Empty arrows represent P700 turnover in the photo-oxidation reduction cycle. Solid arrows indicate electron flow. Dotted arrows indicate electron flow during charge recombination (please see text for further details). Charge recombination is one of the mechanisms of additional electron flow. This figure is a modification of original figures published previously [27,28,29,30,31,32,33,34,35].