“…The electrons originating from the reduced ferredoxin connected with PSI can interact with several ferredoxindependent enzymes during the assimilation of inorganic nitrogen, sulphur, N 2 -fixation, and the regulation of the CO 2 -assimilation cycle (Fukuyama, 2004). Considering the cyclic flow of electrons, which depends only on the photochemical reactions of PSI (Munekage and Shinakai, 2005), the electrons are recycled from ferredoxin to plastoquinone, with concomitant ATP production (Shikanai, 2007). This electron flux may have been intensified in the plants receiving a high Fe concentration (9.00 mM), in detriment to the non-cyclic flow.…”