“…Pc, plastocyanin; P 700 , the dimer of Chl a molecules in PSI; A 0 , the primary electron acceptor in PSI; PhQ, phylloquinone, a secondary electron acceptor in PSI; F X , a 4Fe-4S cluster, a secondary electron acceptor in PSI; F A and F B , 4Fe-4S clusters, the terminal electron acceptors in PSI; Fd, ferredoxin, the mobile electron acceptor; FNR, ferredoxin/NADP + reductase; PQ, PQ •− , and PQH 2 , plastoquinone, plastosemiquinone, and plastoquinol; FeS, a 2Fe-2S cluster of Rieske protein; f, cytochrome f; b L and b H , the low-and high-potential forms of cytochrome (Continued) FIGURE 1 | Continued b 6 ; c n , the heme covalently bound to cytochrome b 6 ; TyrZ, the redox active tyrosine residue; P 680 , the dimer of Chl a molecules in PSII; Pheo, pheophytin, a primary electron acceptor in PSII; Q A , the tightly bound plastoquinone in PSII, the secondary electron acceptor in PSII; Q B , the loosely bound plastoquinone in PSII, the terminal electron acceptor in PSII; VLP, LP, IP, and HP, the very low-, low-, intermediate-, and high-potential forms of cytochrome b 559 in PSII. The E m -values for PSI cofactors are according to Ptushenko et al (2008), those for b 6 /f complex are according to Alric et al (2005), those for PSII are according to Brinkert et al (2016) and Causmaecker et al (2019), except cytochrome b 559 (Khorobrykh, 2019). Closed circles, components situated in hydrophobic zones; open circles, water bulk phases exposed components.…”