Dark Induction of the Non-Photochemical Quenching of Chlorophyll Fluorescence by Acetate in Chlamydomonas reinhardtii

Abstract

Addition of acetate to a suspension of Chlamydomonas reinhardtii cells in darkness induced transient and biphasic non-photochemical quenching of Chl fluorescence (qN) due to ApH-dependent down-regulation of PSII and the transition from state 1 to state 2. We propose that acetate-induced stimulation of the chlororespiratory electron flow triggers the regulation of PSII.