In plants, environmental adversity often leads to the formation of highly reactive oxy gen species. Even though light is the source of energy for photosynthesis, it can also be harmful to plants. Light-induced damage is targeted mainly to photosystem II and leads to the inactivation of electron transport systems and subsequent oxidative destruction of the reaction centers, in particular to the deactivation of PS II center proteins. We showed that incubation of rice leaf under the high light with CO_2-depleted air causes serious demage on photosynthesis, however the application of potassium formate or methanol could protect rice photosynthesis form photoinhibition.
