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We demonstrate here that monohalogenated acetates (MFA , monofluoroacetate; M CA, monochloroacetate; MBA, monobromoacetate) are unique probes of the electron acceptor side of the photosystem II (PS II) reaction center: (1) they differentially inhibit the reoxidation of the reduced primary plastoquinone electron acceptor, Q A  - , by the secondary plastoquinone electron acceptor Q B , and increase the equilibrium [Q A  - ] in the order: MBA ≳ M CA &gt; MFA; and (2) M CA and MBA rephase the PS II electron acceptor side, a rather unusual effect. This results in flash number dependence of [Q A  - ] with maxima at even flashes to change to odd flashes. Furthermore, we demonstrate a correlation between the inhibitory activity of the halogenated acetates with their hydrophobicity (i.e., partition coefficient).

Differential Inhibition and Rephasing of Photosystem II Electron Acceptor Side by Monohalogenated Acetates of Different Hydrophobicity