Evaluation of visible-light wavelengths that reduce or oxidize the plastoquinone pool in green algae with the activated F<sub>0</sub> rise method

We recently developed a chlorophyll fluorescence method (activated F0 rise) for estimating if light wavelength preferably excites PSI or PSII in plants. Here, the was tested green microalgae: Scenedesmus quadricauda, ecornis, fuscus, Chlamydomonas reinhardtii, Chlorella sorokiniana, and Ettlia oleoabundans. The species displayed plant-like action spectra of rise, suggesting that PSII/PSI absorption ratio is conserved from higher plants to algae. rise weak strain C. E. Interestingly, another reinhardtii exhibited strong rise. result indicates same illumination can lead different redox states plastoquinone pool Flavodiiron activity enhanced presumably by oxidizing during pre-illumination. plastid terminal oxidase, turn, diminished but small degree.