Probing the possiblity of characterization of light induced PSII turn over efficiency via monitoring of the reduction of commonly used exogenous electron acceptors.

Photosystem II is the first protein complex in the Light-dependent reactions. It is located in the thylakoid membrane of plants, algae, and cyanobacteria. The enzyme captures photons of light to energize electrons that are then transferred through a variety of coenzymes and cofactors to reduce plastoquinone to plastoquinol. The light reaction (photolysis of water) is entirely dependent on the amount and intensity of light. It is found possible to use exogenous photosynthetic electron acceptors to study the action and efficiency of PSII. We use two of these exogenous electron acceptors to probe the turnover efficiency of PSII using Fluorolog-3 spectrofluorometer and UV-2401 UV-Vis spectrophotometer. And we found that the PSII turnover was high for the first few measurements. The turnover of PSII shows the efficiency of the PSII in the light reaction