Chlorophyll a fluorescence induction: a personal perspective of the thermal phase, the J–I–P rise

摘要: The fast (up to 1 s) chlorophyll (Chl) a fluorescence induction (FI) curve, measured under saturating continuous light, has photochemical phase, the O–J rise, related mainly reduction of QA, primary electron acceptor plastoquinone Photosystem II (PSII); here, rise depends strongly on number photons absorbed. This is followed by thermal J–I–P which disappears at subfreezing temperatures. According mainstream interpretation FI, variable originates from PSII antenna, and oxidized QA most important quencher influencing O–J–I–P curve. As reaction centers are gradually closed Chl fluorescence, F, rises O level (the minimal level) P peak); yet, relationship between F [QA −] not linear, due presence other quenchers modifiers. Several alternative theories have been proposed, give different interpretations transient. main idea in these that almost completely reduced already end phase O–J, but yield lower than its maximum value either second besides or there an another process quenching fluorescence; hypothesis, this consumed (or reversed) during J–I–P. In review, we discuss theories. Based our critical examination, includes pros cons each theory, as well mathematical modeling, conclude transient credible one, none ideas provide adequate explanation experimental proof for complete origin phase. However, suggest some factors proposed newer theories, e.g., membrane potential ΔΨ, suggested Vredenberg his associates, can potentially contribute modulate parallel with through changes antenna and/or center, or, possibly, control oxidation–reduction PQ-pool, including proton transfer into lumen, Rubin associates. We present review personal perspective understanding FI plants algae.