Multiple roles of oxygen in the photoinactivation and dynamic repair of Photosystem II in spinach leaves
Oxygen effects have long been ambiguous: exacerbating, being indifferent to, or ameliorating the net photoinactivation of Photosystem II (PS II). We scrutinized the time course of PS II photoinactivation (characterized by rate coefficient k<inf>i</inf>) in the absence of repair, or when recovery (characterized by k<inf>r</inf>) occurred simultaneously in CO<inf>2</inf> ± O<inf>2</inf>. Oxygen exacerbated photoinactivation per se, but alleviated it by mediating the utilization of electrons. With...[Show more]
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